Articles | Volume 2, issue 2
https://doi.org/10.5194/gchron-2-367-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-2-367-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Dec 2020
Research article |
| 15 Dec 2020
| 15 Dec 2020
Development of a multi-method chronology spanning the Last Glacial Interval from Orakei maar lake, Auckland, New Zealand
School of Environment, The University of Auckland, Auckland, New Zealand
Kathryn E. Fitzsimmons
Research Group for Terrestrial Palaeoclimates, Max Planck Institute for Chemistry, Mainz, Germany
Jenni L. Hopkins
School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand
Andreas Nilsson
Department of Geology, Lund University, Lund, Sweden
Toshiyuki Fujioka
Australian Nuclear Science and Technology Organisation (ANSTO), Lucas
Heights, Australia
currently at: Centro Nacional de Investigación sobre
la Evolución Humana, Burgos, Spain
David Fink
Australian Nuclear Science and Technology Organisation (ANSTO), Lucas
Heights, Australia
Charles Mifsud
Australian Nuclear Science and Technology Organisation (ANSTO), Lucas
Heights, Australia
Marcus Christl
Laboratory of Ion Beam Physics, ETH Zurich, Zürich, Switzerland
Raimund Muscheler
Department of Geology, Lund University, Lund, Sweden
Paul C. Augustinus
School of Environment, The University of Auckland, Auckland, New Zealand
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Benjamin Läuchli, Paul Christian Augustinus, Leonie Peti, and Jenni Louise Hopkins
Sci. Dril., 29, 19–37, https://doi.org/10.5194/sd-29-19-2021, https://doi.org/10.5194/sd-29-19-2021, 2021
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Auckland Volcanic Field maar lake sediments exhibit enormous potential for the identification and interpretation of short-duration climate events and long-term climate trends as well as intra- and inter-hemispheric climate. In tandem with ongoing work on Orakei maar, the study of Onepoto maar lake sediments will extend this record by providing high-resolution palaeoclimate and palaeoenvironmental reconstructions spanning the last two glacial cycles.
Leonie Peti and Paul C. Augustinus
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In 2016, an international team cored Orakei Basin, a former volcanic crater lake in the Auckland Volcanic Field. The retrieved sediment cores are over 100 m long from the basal volcanic eruptive material to the topmost marine mud. The lake sediment sequence of ca. 80 m will be used to reconstruct paleo-environmental and -climatic changes of the region over the last ca. 120 000 years and to reconstruct the history of volcanic eruptions in Auckland through ash layers in the stratigraphic record.
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Since the Pyrenean Last Glacial Maximum (75 ka), the deglaciation of the Ésera glacier (central Pyrenees) was characterized by complex dynamics, with advances and rapid retreats. Cosmogenic dates of moraines along the headwaters of the valley and lacustrine sediments analyses allowed to reconstruct evolutionary history of the Ésera glacier and the associated environmental implications during the last deglaciation and calculate the Equilibrium Line Altitude to determine changes in temperature.
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Preprint archived
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Mass accumulation rates (MAR’s) from wind blown dust (loess) archives are one of the primary tools to gauge past climate conditions in a region. However, many of these reconstructions are based on individual loess sites, which may not be representative of the regional climate. This study investigates the relationship between loess MAR’s and climate, in the context of topography, sediment availability and supply and past circulation in Central and East Asia.
Jenni L. Hopkins, Janine E. Bidmead, David J. Lowe, Richard J. Wysoczanski, Bradley J. Pillans, Luisa Ashworth, Andrew B. H. Rees, and Fiona Tuckett
Geochronology, 3, 465–504, https://doi.org/10.5194/gchron-3-465-2021, https://doi.org/10.5194/gchron-3-465-2021, 2021
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Nathalie Van der Putten, Florian Adolphi, Anette Mellström, Jesper Sjolte, Cyriel Verbruggen, Jan-Berend Stuut, Tobias Erhardt, Yves Frenot, and Raimund Muscheler
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-69, https://doi.org/10.5194/cp-2021-69, 2021
Manuscript not accepted for further review
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In recent decades, Southern Hemisphere westerlies (SHW) moved equator-ward during periods of low solar activity leading to increased winds/precipitation at 46° S, Indian Ocean. We present a terrestrial SHW proxy-record and find stronger SHW influence at Crozet, shortly after 2.8 ka BP, synchronous with a climate shift in the Northern Hemisphere, attributed to a major decline in solar activity. The bipolar response to solar forcing is supported by a climate model forced by solar irradiance only.
Benjamin Läuchli, Paul Christian Augustinus, Leonie Peti, and Jenni Louise Hopkins
Sci. Dril., 29, 19–37, https://doi.org/10.5194/sd-29-19-2021, https://doi.org/10.5194/sd-29-19-2021, 2021
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Auckland Volcanic Field maar lake sediments exhibit enormous potential for the identification and interpretation of short-duration climate events and long-term climate trends as well as intra- and inter-hemispheric climate. In tandem with ongoing work on Orakei maar, the study of Onepoto maar lake sediments will extend this record by providing high-resolution palaeoclimate and palaeoenvironmental reconstructions spanning the last two glacial cycles.
Anne-Marie Wefing, Núria Casacuberta, Marcus Christl, Nicolas Gruber, and John N. Smith
Ocean Sci., 17, 111–129, https://doi.org/10.5194/os-17-111-2021, https://doi.org/10.5194/os-17-111-2021, 2021
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Atlantic Water that carries heat and anthropogenic carbon into the Arctic Ocean plays an important role in the Arctic sea-ice cover decline, but its pathways and travel times remain unclear. Here we used two radionuclides of anthropogenic origin (129I and 236U) to track Atlantic-derived waters along their way through the Arctic Ocean, estimating their travel times and mixing properties. Results help to understand how future changes in Atlantic Water properties will spread through the Arctic.
Michael Sarnthein, Kevin Küssner, Pieter M. Grootes, Blanca Ausin, Timothy Eglinton, Juan Muglia, Raimund Muscheler, and Gordon Schlolaut
Clim. Past, 16, 2547–2571, https://doi.org/10.5194/cp-16-2547-2020, https://doi.org/10.5194/cp-16-2547-2020, 2020
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The dating technique of 14C plateau tuning uses U/Th-based model ages, refinements of the Lake Suigetsu age scale, and the link of surface ocean carbon to the globally mixed atmosphere as basis of age correlation. Our synthesis employs data of 20 sediment cores from the global ocean and offers a coherent picture of global ocean circulation evolving over glacial-to-deglacial times on semi-millennial scales to be compared with climate records stored in marine sediments, ice cores, and speleothems.
Marius L. Huber, Maarten Lupker, Sean F. Gallen, Marcus Christl, and Ananta P. Gajurel
Earth Surf. Dynam., 8, 769–787, https://doi.org/10.5194/esurf-8-769-2020, https://doi.org/10.5194/esurf-8-769-2020, 2020
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Large boulders found in two Himalayan valleys show signs of long fluvial transport (>10 km). Paleo-discharges required to mobilize these boulders exceed typical monsoon discharges. Exposure dating shows that a cluster of these boulders was emplaced ca. 5 kyr ago. This period is coeval with a weakening of the Indian monsoon and glacier retreat in the area. We, therefore, suggest that glacier lake outburst floods are likely mechanisms that can explain these exceptional transport processes.
Jesper Sjolte, Florian Adolphi, Bo M. Vinther, Raimund Muscheler, Christophe Sturm, Martin Werner, and Gerrit Lohmann
Clim. Past, 16, 1737–1758, https://doi.org/10.5194/cp-16-1737-2020, https://doi.org/10.5194/cp-16-1737-2020, 2020
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In this study we investigate seasonal climate reconstructions produced by matching climate model output to ice core and tree-ring data, and we evaluate the model–data reconstructions against meteorological observations. The reconstructions capture the main patterns of variability in sea level pressure and temperature in summer and winter. The performance of the reconstructions depends on seasonal climate variability itself, and definitions of seasons can be optimized to capture this variability.
Anders Svensson, Dorthe Dahl-Jensen, Jørgen Peder Steffensen, Thomas Blunier, Sune O. Rasmussen, Bo M. Vinther, Paul Vallelonga, Emilie Capron, Vasileios Gkinis, Eliza Cook, Helle Astrid Kjær, Raimund Muscheler, Sepp Kipfstuhl, Frank Wilhelms, Thomas F. Stocker, Hubertus Fischer, Florian Adolphi, Tobias Erhardt, Michael Sigl, Amaelle Landais, Frédéric Parrenin, Christo Buizert, Joseph R. McConnell, Mirko Severi, Robert Mulvaney, and Matthias Bigler
Clim. Past, 16, 1565–1580, https://doi.org/10.5194/cp-16-1565-2020, https://doi.org/10.5194/cp-16-1565-2020, 2020
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We identify signatures of large bipolar volcanic eruptions in Greenland and Antarctic ice cores during the last glacial period, which allows for a precise temporal alignment of the ice cores. Thereby the exact timing of unexplained, abrupt climatic changes occurring during the last glacial period can be determined in a global context. The study thus provides a step towards a full understanding of elements of the climate system that may also play an important role in the future.
David Mair, Alessandro Lechmann, Romain Delunel, Serdar Yeşilyurt, Dmitry Tikhomirov, Christof Vockenhuber, Marcus Christl, Naki Akçar, and Fritz Schlunegger
Earth Surf. Dynam., 8, 637–659, https://doi.org/10.5194/esurf-8-637-2020, https://doi.org/10.5194/esurf-8-637-2020, 2020
Florian Mekhaldi, Markus Czymzik, Florian Adolphi, Jesper Sjolte, Svante Björck, Ala Aldahan, Achim Brauer, Celia Martin-Puertas, Göran Possnert, and Raimund Muscheler
Clim. Past, 16, 1145–1157, https://doi.org/10.5194/cp-16-1145-2020, https://doi.org/10.5194/cp-16-1145-2020, 2020
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Due to chronology uncertainties within paleoclimate archives, it is unclear how climate oscillations from different records relate to one another. By using radionuclides to synchronize Greenland ice cores and a German lake record over 11 000 years, we show that two oscillations observed in these records were not synchronous but terminated and began with the onset of a grand solar minimum. Both this and changes in ocean circulation could have played a role in the two climate oscillations.
Oswald Malcles, Philippe Vernant, Jean Chéry, Pierre Camps, Gaël Cazes, Jean-François Ritz, and David Fink
Solid Earth, 11, 241–258, https://doi.org/10.5194/se-11-241-2020, https://doi.org/10.5194/se-11-241-2020, 2020
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We aim to better understand the challenging areas that are the intraplate regions using one example: the southern French Massif Central and its numerous hundreds of meters deep valleys. We apply a multidisciplinary approach there using geomorphology, geochronology, and numerical modeling.
Our dating results show that the canyon incisions are part of the Plio-Quaternary evolution with incision rate of ~ 80 m Ma−1. We propose then that this incision is possible due to an active regional uplift.
Svante Björck, Jesper Sjolte, Karl Ljung, Florian Adolphi, Roger Flower, Rienk H. Smittenberg, Malin E. Kylander, Thomas F. Stocker, Sofia Holmgren, Hui Jiang, Raimund Muscheler, Yamoah K. K. Afrifa, Jayne E. Rattray, and Nathalie Van der Putten
Clim. Past, 15, 1939–1958, https://doi.org/10.5194/cp-15-1939-2019, https://doi.org/10.5194/cp-15-1939-2019, 2019
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Southern Hemisphere westerlies play a key role in regulating global climate. A lake sediment record on a mid-South Atlantic island shows changes in the westerlies and hydroclimate 36.4–18.6 ka. Before 31 ka the westerlies shifted in concert with the bipolar seesaw mechanism in a fairly warm climate, followed by southerly westerlies and falling temperatures. After 27.5 ka temperatures dropped 3 °C with drier conditions and with shifting westerlies possibly triggering the variable LGM CO2 levels.
François Clapuyt, Veerle Vanacker, Marcus Christl, Kristof Van Oost, and Fritz Schlunegger
Solid Earth, 10, 1489–1503, https://doi.org/10.5194/se-10-1489-2019, https://doi.org/10.5194/se-10-1489-2019, 2019
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Using state-of-the-art geomorphic techniques, we quantified a 2-order of magnitude discrepancy between annual, decadal, and millennial sediment fluxes of a landslide-affected mountainous river catchment in the Swiss Alps. Our results illustrate that the impact of a single sediment pulse is strongly attenuated at larger spatial and temporal scales by sediment transport. The accumulation of multiple sediment pulses has rather a measurable impact on the regional pattern of sediment fluxes.
Leonie Peti and Paul C. Augustinus
Sci. Dril., 25, 47–56, https://doi.org/10.5194/sd-25-47-2019, https://doi.org/10.5194/sd-25-47-2019, 2019
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In 2016, an international team cored Orakei Basin, a former volcanic crater lake in the Auckland Volcanic Field. The retrieved sediment cores are over 100 m long from the basal volcanic eruptive material to the topmost marine mud. The lake sediment sequence of ca. 80 m will be used to reconstruct paleo-environmental and -climatic changes of the region over the last ca. 120 000 years and to reconstruct the history of volcanic eruptions in Auckland through ash layers in the stratigraphic record.
Florian Adolphi, Christopher Bronk Ramsey, Tobias Erhardt, R. Lawrence Edwards, Hai Cheng, Chris S. M. Turney, Alan Cooper, Anders Svensson, Sune O. Rasmussen, Hubertus Fischer, and Raimund Muscheler
Clim. Past, 14, 1755–1781, https://doi.org/10.5194/cp-14-1755-2018, https://doi.org/10.5194/cp-14-1755-2018, 2018
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The last glacial period was characterized by a number of rapid climate changes seen, for example, as abrupt warmings in Greenland and changes in monsoon rainfall intensity. However, due to chronological uncertainties it is challenging to know how tightly coupled these changes were. Here we exploit cosmogenic signals caused by changes in the Sun and Earth magnetic fields to link different climate archives and improve our understanding of the dynamics of abrupt climate change.
Maxi Castrillejo, Núria Casacuberta, Marcus Christl, Christof Vockenhuber, Hans-Arno Synal, Maribel I. García-Ibáñez, Pascale Lherminier, Géraldine Sarthou, Jordi Garcia-Orellana, and Pere Masqué
Biogeosciences, 15, 5545–5564, https://doi.org/10.5194/bg-15-5545-2018, https://doi.org/10.5194/bg-15-5545-2018, 2018
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The investigation of water mass transport pathways and timescales is important to understand the global ocean circulation. Following earlier studies, we use artificial radionuclides introduced to the oceans in the 1950s to investigate the water transport in the subpolar North Atlantic (SPNA). For the first time, we combine measurements of the long-lived iodine-129 and uranium-236 to confirm earlier findings/hypotheses and to better understand shallow and deep ventilation processes in the SPNA.
Max Boxleitner, Susan Ivy-Ochs, Dagmar Brandova, Marcus Christl, Markus Egli, and Max Maisch
Geogr. Helv., 73, 241–252, https://doi.org/10.5194/gh-73-241-2018, https://doi.org/10.5194/gh-73-241-2018, 2018
Jesper Sjolte, Christophe Sturm, Florian Adolphi, Bo M. Vinther, Martin Werner, Gerrit Lohmann, and Raimund Muscheler
Clim. Past, 14, 1179–1194, https://doi.org/10.5194/cp-14-1179-2018, https://doi.org/10.5194/cp-14-1179-2018, 2018
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Tropical volcanic eruptions and variations in solar activity have been suggested to influence the strength of westerly winds across the North Atlantic. We use Greenland ice core records together with a climate model simulation, and find stronger westerly winds for five winters following tropical volcanic eruptions. We see a delayed response to solar activity of 5 years, and the response to solar minima corresponds well to the cooling pattern during the period known as the Little Ice Age.
Minjie Zheng, Jesper Sjolte, Florian Adolphi, Bo Møllesøe Vinther, Hans Christian Steen-Larsen, Trevor James Popp, and Raimund Muscheler
Clim. Past, 14, 1067–1078, https://doi.org/10.5194/cp-14-1067-2018, https://doi.org/10.5194/cp-14-1067-2018, 2018
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We show the seasonal δ18O data from the NEEM site in northwestern Greenland over the last 150 years. We found that the NEEM summer δ18O signal correlates well with summer temperature in western coastal Greenland, while the NEEM winter δ18O signal correlates well with sea ice concentration in Baffin Bay. In contrast with the winter δ18O data from central/southern Greenland, we find no linkage of NEEM winter δ18O to winter NAO.
Markus Czymzik, Raimund Muscheler, Florian Adolphi, Florian Mekhaldi, Nadine Dräger, Florian Ott, Michał Słowinski, Mirosław Błaszkiewicz, Ala Aldahan, Göran Possnert, and Achim Brauer
Clim. Past, 14, 687–696, https://doi.org/10.5194/cp-14-687-2018, https://doi.org/10.5194/cp-14-687-2018, 2018
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Our results provide a proof of concept for facilitating 10Be in varved lake sediments as a novel synchronization tool required for investigating leads and lags of proxy responses to climate variability. They also point to some limitations of 10Be in these archives mainly connected to in-lake sediment resuspension processes.
Martin Struck, John D. Jansen, Toshiyuki Fujioka, Alexandru T. Codilean, David Fink, Réka-Hajnalka Fülöp, Klaus M. Wilcken, David M. Price, Steven Kotevski, L. Keith Fifield, and John Chappell
Earth Surf. Dynam., 6, 329–349, https://doi.org/10.5194/esurf-6-329-2018, https://doi.org/10.5194/esurf-6-329-2018, 2018
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Measurements of cosmogenic nuclides 10Be and 26Al in sediment along central Australian streams show that lithologically controlled magnitudes of source-area erosion rates (0.2–11 m Myr-1) are preserved downstream despite sediment mixing. Conversely, downstream-increasing sediment burial signals (> 400 kyr) indicate sediment incorporation from adjacent, long-exposed storages, which, combined with low sediment supply and discontinuous flux, likely favours source-area 10Be–26Al signal masking.
Catharina Dieleman, Susan Ivy-Ochs, Kristina Hippe, Olivia Kronig, Florian Kober, and Marcus Christl
E&G Quaternary Sci. J., 67, 17–23, https://doi.org/10.5194/egqsj-67-17-2018, https://doi.org/10.5194/egqsj-67-17-2018, 2018
Yue Li, Yougui Song, Kathryn E. Fitzsimmons, Hong Chang, Rustam Orozbaev, and Xinxin Li
Clim. Past, 14, 271–286, https://doi.org/10.5194/cp-14-271-2018, https://doi.org/10.5194/cp-14-271-2018, 2018
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This paper finds a close tie between loess magnetic susceptibility and wind strength in the Ili Basin, eastern Central Asia, and identifies three distinct aerodynamic environments with end-member modeling analysis of grain size. The Siberian High is the dominant influence on wind dynamics, resulting in loess deposition, and acts as a teleconnection between the climatic systems of the North Atlantic and East Asia in the high northern latitudes, but not for the mid-latitude westerlies.
Antoine Cogez, Frédéric Herman, Éric Pelt, Thierry Reuschlé, Gilles Morvan, Christopher M. Darvill, Kevin P. Norton, Marcus Christl, Lena Märki, and François Chabaux
Earth Surf. Dynam., 6, 121–140, https://doi.org/10.5194/esurf-6-121-2018, https://doi.org/10.5194/esurf-6-121-2018, 2018
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Sediments produced by glaciers are transported by rivers and wind toward the ocean. During their journey, these sediments are weathered, and we know that this has an impact on climate. One key factor is time, but the duration of this journey is largely unknown. We were able to measure the average time that sediment spends only in the glacial area. This time is 100–200 kyr, which is long and allows a lot of processes to act on sediments during their journey.
Lorenz Wüthrich, Claudio Brändli, Régis Braucher, Heinz Veit, Negar Haghipour, Carla Terrizzano, Marcus Christl, Christian Gnägi, and Roland Zech
E&G Quaternary Sci. J., 66, 57–68, https://doi.org/10.5194/egqsj-66-57-2017, https://doi.org/10.5194/egqsj-66-57-2017, 2017
Johann H. Jungclaus, Edouard Bard, Mélanie Baroni, Pascale Braconnot, Jian Cao, Louise P. Chini, Tania Egorova, Michael Evans, J. Fidel González-Rouco, Hugues Goosse, George C. Hurtt, Fortunat Joos, Jed O. Kaplan, Myriam Khodri, Kees Klein Goldewijk, Natalie Krivova, Allegra N. LeGrande, Stephan J. Lorenz, Jürg Luterbacher, Wenmin Man, Amanda C. Maycock, Malte Meinshausen, Anders Moberg, Raimund Muscheler, Christoph Nehrbass-Ahles, Bette I. Otto-Bliesner, Steven J. Phipps, Julia Pongratz, Eugene Rozanov, Gavin A. Schmidt, Hauke Schmidt, Werner Schmutz, Andrew Schurer, Alexander I. Shapiro, Michael Sigl, Jason E. Smerdon, Sami K. Solanki, Claudia Timmreck, Matthew Toohey, Ilya G. Usoskin, Sebastian Wagner, Chi-Ju Wu, Kok Leng Yeo, Davide Zanchettin, Qiong Zhang, and Eduardo Zorita
Geosci. Model Dev., 10, 4005–4033, https://doi.org/10.5194/gmd-10-4005-2017, https://doi.org/10.5194/gmd-10-4005-2017, 2017
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Climate model simulations covering the last millennium provide context for the evolution of the modern climate and for the expected changes during the coming centuries. They can help identify plausible mechanisms underlying palaeoclimatic reconstructions. Here, we describe the forcing boundary conditions and the experimental protocol for simulations covering the pre-industrial millennium. We describe the PMIP4 past1000 simulations as contributions to CMIP6 and additional sensitivity experiments.
Maarten Lupker, Jérôme Lavé, Christian France-Lanord, Marcus Christl, Didier Bourlès, Julien Carcaillet, Colin Maden, Rainer Wieler, Mustafizur Rahman, Devojit Bezbaruah, and Liu Xiaohan
Earth Surf. Dynam., 5, 429–449, https://doi.org/10.5194/esurf-5-429-2017, https://doi.org/10.5194/esurf-5-429-2017, 2017
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We use geochemical approaches (10Be) on river sediments to quantify the erosion rates across the Tsangpo-Brahmaputra (TB) catchment in the eastern Himalayas. Our approach confirms the high erosion rates in the eastern Himalayan syntaxis region and we suggest that the abrasion of landslide material in the syntaxis is a key process in explaining how erosion signals are transferred to the sediment load.
Eric Laloy, Koen Beerten, Veerle Vanacker, Marcus Christl, Bart Rogiers, and Laurent Wouters
Earth Surf. Dynam., 5, 331–345, https://doi.org/10.5194/esurf-5-331-2017, https://doi.org/10.5194/esurf-5-331-2017, 2017
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Over very long timescales, 100 000 years or more, landscapes may drastically change. Sediments preserved in these landscapes have a cosmogenic radionuclide inventory that tell us when and how fast such changes took place. In this paper, we provide first evidence of an elevated long-term erosion rate of the northwestern Campine Plateau (lowland Europe), which can be explained by the loose nature of the subsoil.
Jean L. Dixon, Friedhelm von Blanckenburg, Kurt Stüwe, and Marcus Christl
Earth Surf. Dynam., 4, 895–909, https://doi.org/10.5194/esurf-4-895-2016, https://doi.org/10.5194/esurf-4-895-2016, 2016
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We quantify the glacial legacy of Holocene erosion at the eastern edge of the European Alps and add insight to the debate on drivers of Alpine erosion. We present the first data explicitly comparing 10Be-based erosion rates in previously glaciated and non-glaciated basins (n = 26). Erosion rates vary 5-fold across the region, correlating with local topography and glacial history. Our approach and unique study site allow us to isolate the role of glacial topographic legacies from other controls.
James Shulmeister, Justine Kemp, Kathryn E. Fitzsimmons, and Allen Gontz
Clim. Past, 12, 1435–1444, https://doi.org/10.5194/cp-12-1435-2016, https://doi.org/10.5194/cp-12-1435-2016, 2016
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This paper highlights that small dunes (lunettes) formed on the eastern side of a lake in the Australian sub-tropics at the height of the last ice age (about 21,000 years ago) and in the early part of the current interglacial (9–6,000 years ago). This means that it was fairly wet at these times and also that there were strong westerly winds to form the dunes. Today strong westerly winds occur in winter, and we infer that the same was also true at those times, suggesting no change in circulation.
Markus Czymzik, Raimund Muscheler, and Achim Brauer
Clim. Past, 12, 799–805, https://doi.org/10.5194/cp-12-799-2016, https://doi.org/10.5194/cp-12-799-2016, 2016
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Integrating discharge data of the River Ammer back to 1926 and a 5500-year flood layer record from an annually laminated sediment core of the downstream Ammersee allowed investigating changes in the frequency of major floods in Central Europe on interannual to multi-centennial timescales. Significant correlations between flood frequency variations in both archives and changes in the activity of the Sun suggest a solar influence on the frequency of these hydrometeorological extremes.
Michael Sigl, Tyler J. Fudge, Mai Winstrup, Jihong Cole-Dai, David Ferris, Joseph R. McConnell, Ken C. Taylor, Kees C. Welten, Thomas E. Woodruff, Florian Adolphi, Marion Bisiaux, Edward J. Brook, Christo Buizert, Marc W. Caffee, Nelia W. Dunbar, Ross Edwards, Lei Geng, Nels Iverson, Bess Koffman, Lawrence Layman, Olivia J. Maselli, Kenneth McGwire, Raimund Muscheler, Kunihiko Nishiizumi, Daniel R. Pasteris, Rachael H. Rhodes, and Todd A. Sowers
Clim. Past, 12, 769–786, https://doi.org/10.5194/cp-12-769-2016, https://doi.org/10.5194/cp-12-769-2016, 2016
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Here we present a chronology (WD2014) for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide ice core, which is based on layer counting of distinctive annual cycles preserved in the elemental, chemical and electrical conductivity records. We validated the chronology by comparing it to independent high-accuracy, absolutely dated chronologies. Given its demonstrated high accuracy, WD2014 can become a reference chronology for the Southern Hemisphere.
F. Adolphi and R. Muscheler
Clim. Past, 12, 15–30, https://doi.org/10.5194/cp-12-15-2016, https://doi.org/10.5194/cp-12-15-2016, 2016
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Here we employ common variations in tree-ring 14C and Greenland ice core 10Be records to synchronize the Greenland ice core (GICC05) and the radiocarbon (IntCal13) timescale over the Holocene. We propose a transfer function between both timescales that allows continuous comparisons between radiocarbon dated and ice core climate records at unprecedented chronological precision.
C. Elsässer, D. Wagenbach, I. Levin, A. Stanzick, M. Christl, A. Wallner, S. Kipfstuhl, I. K. Seierstad, H. Wershofen, and J. Dibb
Clim. Past, 11, 115–133, https://doi.org/10.5194/cp-11-115-2015, https://doi.org/10.5194/cp-11-115-2015, 2015
Related subject area
Geochronological data analysis/statistics/modelling
Short communication: Nanoscale heterogeneity of U and Pb in baddeleyite from atom probe tomography – 238U series alpha recoil effects and U atom clustering
In situ rubidium–strontium geochronology of white mica in young metamafic and metasomatic rocks from Syros: testing the limits of laser-ablation triple-quadrupole inductively coupled plasma mass spectrometer mica dating using different anchoring approaches
An optimization tool for identifying multiple-diffusion domain model parameters
Technical note: RA138 calcite U–Pb LA-ICP-MS primary reference material
Revising chronological uncertainties in marine archives using global anthropogenic signals: a case study on the oceanic 13C Suess effect
The daughter–parent plot: a tool for analyzing thermochronological data
Errorchrons and anchored isochrons in IsoplotR
Short communication: Resolving the discrepancy between U–Pb age estimates for the “Likhall” bed, a key level in the Ordovician timescale
Navigating the complexity of detrital rutile provenance: methodological insights from the Neotethys Orogen in Anatolia
Solving crustal heat transfer for thermochronology using physics-informed neural networks
Interpreting cooling dates and histories from laser ablation in-situ (U-Th-Sm)/He thermochronometry
Minimizing the effects of Pb loss in detrital and igneous U–Pb zircon geochronology by CA-LA-ICP-MS
Modeling apparent Pb loss in zircon U–Pb geochronology
Calibration methods for laser ablation Rb–Sr geochronology: comparisons and recommendation based on NIST glass and natural reference materials
Short communication: The Wasserstein distance as a dissimilarity metric for comparing detrital age spectra and other geological distributions
ChronoLorica: introduction of a soil–landscape evolution model combined with geochronometers
Technical note: colab_zirc_dims: a Google Colab-compatible toolset for automated and semi-automated measurement of mineral grains in laser ablation–inductively coupled plasma–mass spectrometry images using deep learning models
Calculation of uncertainty in the (U–Th) ∕ He system
Bayesian age–depth modelling applied to varve and radiometric dating to optimize the transfer of an existing high-resolution chronology to a new composite sediment profile from Holzmaar (West Eifel Volcanic Field, Germany)
Short communication: age2exhume – a MATLAB/Python script to calculate steady-state vertical exhumation rates from thermochronometric ages and application to the Himalaya
U and Th content in magnetite and Al spinel obtained by wet chemistry and laser ablation methods: implication for (U–Th) ∕ He thermochronometer
In situ LA-ICPMS U–Pb dating of sulfates: applicability of carbonate reference materials as matrix-matched standards
An algorithm for U–Pb geochronology by secondary ion mass spectrometry
Technical note: Rapid phase identification of apatite and zircon grains for geochronology using X-ray micro-computed tomography
Simulating sedimentary burial cycles – Part 2: Elemental-based multikinetic apatite fission-track interpretation and modelling techniques illustrated using examples from northern Yukon
sandbox – creating and analysing synthetic sediment sections with R
Improving age–depth relationships by using the LANDO (“Linked age and depth modeling”) model ensemble
How many grains are needed for quantifying catchment erosion from tracer thermochronology?
Short communication: Inverse isochron regression for Re–Os, K–Ca and other chronometers
Technical note: Analytical protocols and performance for apatite and zircon (U–Th) ∕ He analysis on quadrupole and magnetic sector mass spectrometer systems between 2007 and 2020
Simulating sedimentary burial cycles – Part 1: Investigating the role of apatite fission track annealing kinetics using synthetic data
The closure temperature(s) of zircon Raman dating
On the treatment of discordant detrital zircon U–Pb data
An evaluation of Deccan Traps eruption rates using geochronologic data
geoChronR – an R package to model, analyze, and visualize age-uncertain data
Robust isochron calculation
Resolving the timescales of magmatic and hydrothermal processes associated with porphyry deposit formation using zircon U–Pb petrochronology
Seasonal deposition processes and chronology of a varved Holocene lake sediment record from Chatyr Kol lake (Kyrgyz Republic)
Unifying the U–Pb and Th–Pb methods: joint isochron regression and common Pb correction
Exploring the advantages and limitations of in situ U–Pb carbonate geochronology using speleothems
Steven Denyszyn, Donald W. Davis, and Denis Fougerouse
Geochronology, 6, 607–619, https://doi.org/10.5194/gchron-6-607-2024, https://doi.org/10.5194/gchron-6-607-2024, 2024
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Decay of U to Pb in baddeleyite is used for dating mafic rocks, but some daughter Pb atoms can be ejected out of the crystal, resulting in ages that seem too young. Atom probe tomography was used to map U and Pb atoms in 3D within baddeleyite crystals and estimate the average distance that Pb atoms are displaced by recoil. This allows us to test the relationship between crystal size and apparent age. There is also evidence for clustering of U atoms, inviting more work on how this may occur.
Jesús Muñoz-Montecinos, Andrea Giuliani, Senan Oesch, Silvia Volante, Bradley Peters, and Whitney Behr
Geochronology, 6, 585–605, https://doi.org/10.5194/gchron-6-585-2024, https://doi.org/10.5194/gchron-6-585-2024, 2024
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Dating the roots of plate boundaries is essential for understanding geologic processes, but geochemical limitations, particularly in young mafic rocks, make this challenging. Advancements in mass spectrometry now enable high-resolution analysis of micro-domains. We assess these limitations by dating rocks from Syros. Multi-phase mineral analysis improves age uncertainty 6-fold. We emphasize the importance of the local geologic context and propose strategies to mitigate uncertainties.
Andrew L. Gorin, Joshua M. Gorin, Marie Bergelin, and David L. Shuster
Geochronology, 6, 521–540, https://doi.org/10.5194/gchron-6-521-2024, https://doi.org/10.5194/gchron-6-521-2024, 2024
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The multiple-diffusion domain (MDD) model quantifies the temperature dependence of noble gas diffusivity in minerals. However, current methods for tuning MDD parameters can yield biased results, leading to underestimates of sample temperatures through geologic time. Our "MDD Tool Kit" software optimizes all MDD parameters simultaneously, overcoming these biases. We then apply this software to a previously published 40Ar/39Ar dataset (Wong, 2023) to showcase its efficacy.
Marcel Guillong, Elias Samankassou, Inigo A. Müller, Dawid Szymanowski, Nathan Looser, Lorenzo Tavazzani, Óscar Merino-Tomé, Juan R. Bahamonde, Yannick Buret, and Maria Ovtcharova
Geochronology, 6, 465–474, https://doi.org/10.5194/gchron-6-465-2024, https://doi.org/10.5194/gchron-6-465-2024, 2024
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RA138 is a new reference material for U–Pb dating of carbonate samples via laser ablation inductively coupled plasma mass spectrometry. RA138 exhibits variable U–Pb ratios and consistent U content, resulting in a precise isochron with low uncertainty. Isotope dilution thermal ionization mass spectrometry analyses fix a reference age of 321.99 ± 0.65 Ma. This research advances our ability to date carbonate samples accurately, providing insights into geological processes and historical timelines.
Nil Irvalı, Ulysses S. Ninnemann, Are Olsen, Neil L. Rose, David J. R. Thornalley, Tor L. Mjell, and François Counillon
Geochronology, 6, 449–463, https://doi.org/10.5194/gchron-6-449-2024, https://doi.org/10.5194/gchron-6-449-2024, 2024
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Marine sediments are excellent archives for reconstructing past changes in climate and ocean circulation. Yet, dating uncertainties, particularly during the 20th century, pose major challenges. Here we propose a novel chronostratigraphic approach that uses anthropogenic signals, such as the oceanic 13C Suess effect and spheroidal carbonaceous fly-ash particles, to reduce age model uncertainties in high-resolution marine archives over the 20th century.
Birk Härtel and Eva Enkelmann
Geochronology, 6, 429–448, https://doi.org/10.5194/gchron-6-429-2024, https://doi.org/10.5194/gchron-6-429-2024, 2024
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We present a new data analysis workflow for thermochronological data based on plots of radiogenic daughter vs. radioactive parent concentration. The daughter–parent relationship helps to identify the sources of age variation. Our workflow classifies the daughter–parent relationship and provides further suggestions, e.g., if a dataset can be described by a sample age and which type of sample age to report. We also introduce Incaplot, which is software for creating daughter–parent plots.
Pieter Vermeesch
Geochronology, 6, 397–407, https://doi.org/10.5194/gchron-6-397-2024, https://doi.org/10.5194/gchron-6-397-2024, 2024
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The age of some geological materials can be estimated from the ratio of certain radiogenic "daughter" isotopes to their radioactive "parent". However, in many cases, the age estimation process is complicated by the presence of an inherited component of non-radiogenic daughter isotopes. This paper presents an improved algorithm to estimate the radiogenic and non-radiogenic components, either separately or jointly.
André Navin Paul, Anders Lindskog, and Urs Schaltegger
Geochronology, 6, 325–335, https://doi.org/10.5194/gchron-6-325-2024, https://doi.org/10.5194/gchron-6-325-2024, 2024
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The “Likhall” bed helps to constrain the timing of increased meteorite bombardment of the Earth during the Ordovician period. It is important to understand the timing of this meteorite bombardment when attempting to correlate it with biodiversity changes during the Ordovician period. Calibrating a good age for the “Likhall” bed is, however, challenging and benefited in this study from advances in sample preparation.
Megan A. Mueller, Alexis Licht, Andreas Möller, Cailey B. Condit, Julie C. Fosdick, Faruk Ocakoğlu, and Clay Campbell
Geochronology, 6, 265–290, https://doi.org/10.5194/gchron-6-265-2024, https://doi.org/10.5194/gchron-6-265-2024, 2024
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Sedimentary provenance refers to the study of the origin of sedimentary rocks, tracing where sediment particles originated. Common sedimentary provenance techniques struggle to track mafic igneous and metamorphic rock sources and rutile forms in these rock types. We use rutile form ancient sedimentary rocks in Türkiye to present new recommendations and workflows for integrating rutile U–Pb ages and chemical composition into an accurate sedimentary provenance reconstruction.
Ruohong Jiao, Shengze Cai, and Jean Braun
Geochronology, 6, 227–245, https://doi.org/10.5194/gchron-6-227-2024, https://doi.org/10.5194/gchron-6-227-2024, 2024
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We demonstrate a machine learning method to estimate the temperature changes in the Earth's crust over time. The method respects physical laws and conditions imposed by users. By using observed rock cooling ages as constraints, the method can be used to estimate the tectonic and landscape evolution of the Earth. We show the applications of the method using a synthetic rock uplift model in 1D and an evolution model of a real mountain range in 3D.
Christoph Glotzbach and Todd A. Ehlers
Geochronology Discuss., https://doi.org/10.5194/gchron-2024-12, https://doi.org/10.5194/gchron-2024-12, 2024
Revised manuscript accepted for GChron
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The (U-Th)/He dating method helps understand rock’s cooling history. Synthetic modeling experiments were conducted to explore factors affecting in-situ vs. whole-grain (U-Th)/He dates. In-situ dates are often 30 % older than whole-grain dates, whereas very rapid cooling makes helium loss negligible, resulting in similar whole-grain and in-situ dates. In addition, in-situ data can reveal cooling histories even from a single grain by measuring helium distributions.
Erin E. Donaghy, Michael P. Eddy, Federico Moreno, and Mauricio Ibañez-Mejia
Geochronology, 6, 89–106, https://doi.org/10.5194/gchron-6-89-2024, https://doi.org/10.5194/gchron-6-89-2024, 2024
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Chemical abrasion (CA) is a technique that reduces or eliminates the effects of Pb loss in zircon U–Pb geochronology. However, CA has yet to be applied to large-n detrital zircon (DZ) analyses. We show that CA does not negatively impact or systematically bias U–Pb dates, improves the resolution of age populations defined by 206Pb/238U dates, and increases the percentage of concordant analyses in age populations defined by 207Pb/206Pb dates.
Glenn R. Sharman and Matthew A. Malkowski
Geochronology, 6, 37–51, https://doi.org/10.5194/gchron-6-37-2024, https://doi.org/10.5194/gchron-6-37-2024, 2024
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The mineral zircon is widely used to determine the age of rocks based on the radioactive decay of U to Pb, but the measured U–Pb date can be too young if the zircon loses Pb. We present a method for estimating the distribution of apparent Pb loss by mathematical convolution. Applying this approach to 10 samples illustrates contrasting patterns of apparent Pb loss. This study highlights the importance of quantifying Pb loss to better understand its potential effects on zircon U–Pb dates.
Stijn Glorie, Sarah E. Gilbert, Martin Hand, and Jarred C. Lloyd
Geochronology, 6, 21–36, https://doi.org/10.5194/gchron-6-21-2024, https://doi.org/10.5194/gchron-6-21-2024, 2024
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Radiometric dating methods, involving laser ablation as the sample introduction, require robust calibrations to reference materials with similar ablation properties to the analysed samples. In the case of the rubidium–strontium dating method, calibrations are often conducted to nano powder with different ablation characteristics than the crystalline minerals. We describe the limitations of this approach and recommend an alternative calibration method involving natural minerals.
Alex Lipp and Pieter Vermeesch
Geochronology, 5, 263–270, https://doi.org/10.5194/gchron-5-263-2023, https://doi.org/10.5194/gchron-5-263-2023, 2023
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We propose using the Wasserstein-2 distance (W2) as an alternative to the widely used Kolmogorov–Smirnov (KS) statistic for analysing distributional data in geochronology. W2 measures the horizontal distance between observations, while KS measures vertical differences in cumulative distributions. Using case studies, we find that W2 is preferable in scenarios where the absolute age differences in observations provide important geological information. W2 has been added to the R package IsoplotR.
W. Marijn van der Meij, Arnaud J. A. M. Temme, Steven A. Binnie, and Tony Reimann
Geochronology, 5, 241–261, https://doi.org/10.5194/gchron-5-241-2023, https://doi.org/10.5194/gchron-5-241-2023, 2023
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We present our model ChronoLorica. We coupled the original Lorica model, which simulates soil and landscape evolution, with a geochronological module that traces cosmogenic nuclide inventories and particle ages through simulations. These properties are often measured in the field to determine rates of landscape change. The coupling enables calibration of the model and the study of how soil, landscapes and geochronometers change under complex boundary conditions such as intensive land management.
Michael C. Sitar and Ryan J. Leary
Geochronology, 5, 109–126, https://doi.org/10.5194/gchron-5-109-2023, https://doi.org/10.5194/gchron-5-109-2023, 2023
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We developed code to automatically and semi-automatically measure dimensions of detrital mineral grains in reflected-light images saved at laser ablation–inductively coupled plasma–mass spectrometry facilities that use Chromium targeting software. Our code uses trained deep learning models to segment grain images with greater accuracy than is achievable using other segmentation techniques. We implement our code in Jupyter notebooks which can also be run online via Google Colab.
Peter E. Martin, James R. Metcalf, and Rebecca M. Flowers
Geochronology, 5, 91–107, https://doi.org/10.5194/gchron-5-91-2023, https://doi.org/10.5194/gchron-5-91-2023, 2023
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There is currently no standardized method of performing uncertainty propagation in the (U–Th) / He system, causing data interpretation difficulties. We present two methods of uncertainty propagation and describe free, open-source software (HeCalc) to apply them. Compilation of real data using only analytical uncertainty as well as 2 % and 5 % uncertainties in FT yields respective median relative date uncertainties of 2.9 %, 3.3 %, and 5.0 % for apatites and 1.7 %, 3.3 %, and 5.0 % for zircons.
Stella Birlo, Wojciech Tylmann, and Bernd Zolitschka
Geochronology, 5, 65–90, https://doi.org/10.5194/gchron-5-65-2023, https://doi.org/10.5194/gchron-5-65-2023, 2023
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Sediment cores from the volcanic lake Holzmaar provide a very precise chronology based on tree-ring-like annual laminations or varves. We statistically combine this varve chronology with radiometric dating and tested three different methods to upgrade the age–depth model. However, only one of the three methods tested improved the dating accuracy considerably. With this work, an overview of different age integration methods is discussed and made available for increased future demands.
Peter van der Beek and Taylor F. Schildgen
Geochronology, 5, 35–49, https://doi.org/10.5194/gchron-5-35-2023, https://doi.org/10.5194/gchron-5-35-2023, 2023
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Thermochronometric data can provide unique insights into the patterns of rock exhumation and the driving mechanisms of landscape evolution. Several well-established thermal models allow for a detailed exploration of how cooling rates evolved in a limited area or along a transect, but more regional analyses have been challenging. We present age2exhume, a thermal model that can be used to rapidly provide a synoptic overview of exhumation rates from large regional thermochronologic datasets.
Marianna Corre, Arnaud Agranier, Martine Lanson, Cécile Gautheron, Fabrice Brunet, and Stéphane Schwartz
Geochronology, 4, 665–681, https://doi.org/10.5194/gchron-4-665-2022, https://doi.org/10.5194/gchron-4-665-2022, 2022
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This study is focused on the accurate measurement of U and Th by wet chemistry and laser ablation methods to improve (U–Th)/He dating of magnetite and spinel. The low U–Th content and the lack of specific U–Th standards significantly limit the accuracy of (U–Th)/He dating. Obtained U–Th results on natural and synthetic magnetite and aluminous spinel samples analyzed by wet chemistry methods and LA-ICP-MS sampling have important implications for the (U–Th)/He method and dates interpretation.
Aratz Beranoaguirre, Iuliana Vasiliev, and Axel Gerdes
Geochronology, 4, 601–616, https://doi.org/10.5194/gchron-4-601-2022, https://doi.org/10.5194/gchron-4-601-2022, 2022
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U–Pb dating by the in situ laser ablation mass spectrometry (LA-ICPMS) technique requires reference materials of the same nature as the samples to be analysed. Here, we have explored the suitability of using carbonate materials as a reference for sulfates, since there is no sulfate reference material. The results we obtained are satisfactory, and thus, from now on, the sulfates can also be analysed.
Pieter Vermeesch
Geochronology, 4, 561–576, https://doi.org/10.5194/gchron-4-561-2022, https://doi.org/10.5194/gchron-4-561-2022, 2022
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Secondary ion mass spectrometry (SIMS) is the oldest and most sensitive analytical technique for in situ U–Pb geochronology. This paper introduces a new algorithm for SIMS data reduction that treats data as
compositional data, which means that the relative abundances of 204Pb, 206Pb, 207Pb, and 238Pb are processed within a tetrahedral data space or
simplex. The new method is implemented in an eponymous computer programme that is compatible with the two dominant types of SIMS instruments.
Emily H. G. Cooperdock, Florian Hofmann, Ryley M. C. Tibbetts, Anahi Carrera, Aya Takase, and Aaron J. Celestian
Geochronology, 4, 501–515, https://doi.org/10.5194/gchron-4-501-2022, https://doi.org/10.5194/gchron-4-501-2022, 2022
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Apatite and zircon are the most widely used minerals for dating rocks, but they can be difficult to identify in some crushed rock samples. Incorrect mineral identification results in wasted analytical resources and inaccurate data. We show how X-ray computed tomography can be used to efficiently and accurately distinguish apatite from zircon based on density variations, and provide non-destructive 3D grain-specific size, shape, and inclusion information for improved data quality.
Dale R. Issler, Kalin T. McDannell, Paul B. O'Sullivan, and Larry S. Lane
Geochronology, 4, 373–397, https://doi.org/10.5194/gchron-4-373-2022, https://doi.org/10.5194/gchron-4-373-2022, 2022
Short summary
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Phanerozoic sedimentary rocks of northern Canada have compositionally heterogeneous detrital apatite with high age dispersion caused by differential thermal annealing. Discrete apatite fission track kinetic populations with variable annealing temperatures are defined using elemental data but are poorly resolved using conventional parameters. Inverse thermal modelling of samples from northern Yukon reveals a record of multiple heating–cooling cycles consistent with geological constraints.
Michael Dietze, Sebastian Kreutzer, Margret C. Fuchs, and Sascha Meszner
Geochronology, 4, 323–338, https://doi.org/10.5194/gchron-4-323-2022, https://doi.org/10.5194/gchron-4-323-2022, 2022
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The R package sandbox is a collection of functions that allow the creation, sampling and analysis of fully virtual sediment sections, like having a virtual twin of real-world deposits. This article introduces the concept, features, and workflows required to use sandbox. It shows how a real-world sediment section can be mapped into the model and subsequently addresses a series of theoretical and practical questions, exploiting the flexibility of the model framework.
Gregor Pfalz, Bernhard Diekmann, Johann-Christoph Freytag, Liudmila Syrykh, Dmitry A. Subetto, and Boris K. Biskaborn
Geochronology, 4, 269–295, https://doi.org/10.5194/gchron-4-269-2022, https://doi.org/10.5194/gchron-4-269-2022, 2022
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We use age–depth modeling systems to understand the relationship between age and depth in lake sediment cores. However, depending on which modeling system we use, the model results may vary. We provide a tool to link different modeling systems in an interactive computational environment and make their results comparable. We demonstrate the power of our tool by highlighting three case studies in which we test our application for single-sediment cores and a collection of multiple sediment cores.
Andrea Madella, Christoph Glotzbach, and Todd A. Ehlers
Geochronology, 4, 177–190, https://doi.org/10.5194/gchron-4-177-2022, https://doi.org/10.5194/gchron-4-177-2022, 2022
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Cooling ages date the time at which minerals cross a certain isotherm on the way up to Earth's surface. Such ages can be measured from bedrock material and river sand. If spatial variations in bedrock ages are known in a river catchment, the spatial distribution of erosion can be inferred from the distribution of the ages measured from the river sand grains. Here we develop a new tool to help such analyses, with particular emphasis on quantifying uncertainties due to sample size.
Yang Li and Pieter Vermeesch
Geochronology, 3, 415–420, https://doi.org/10.5194/gchron-3-415-2021, https://doi.org/10.5194/gchron-3-415-2021, 2021
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A conventional isochron is a straight-line fit to two sets of isotopic ratios, D/d and P/d, where P is the radioactive parent, D is the radiogenic daughter, and d is a second isotope of the daughter element. The slope of this line is proportional to the age of the system. An inverse isochron is a linear fit through d/D and P/D. The horizontal intercept of this line is inversely proportional to the age. The latter approach is preferred when d<D, which is the case in Re–Os and K–Ca geochronology.
Cécile Gautheron, Rosella Pinna-Jamme, Alexis Derycke, Floriane Ahadi, Caroline Sanchez, Frédéric Haurine, Gael Monvoisin, Damien Barbosa, Guillaume Delpech, Joseph Maltese, Philippe Sarda, and Laurent Tassan-Got
Geochronology, 3, 351–370, https://doi.org/10.5194/gchron-3-351-2021, https://doi.org/10.5194/gchron-3-351-2021, 2021
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Apatite and zircon (U–Th) / He thermochronology is now a mainstream tool to reconstruct Earth's evolution through the history of cooling and exhumation over the first dozen kilometers. The geological implications of these data rely on the precision of measurements of He, U, Th, and Sm contents in crystals. This technical note documents the methods for He thermochronology developed at the GEOPS laboratory, Paris-Saclay University, that allow (U–Th) / He data to be obtained with precision.
Kalin T. McDannell and Dale R. Issler
Geochronology, 3, 321–335, https://doi.org/10.5194/gchron-3-321-2021, https://doi.org/10.5194/gchron-3-321-2021, 2021
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We generated a synthetic dataset applying published kinetic models and distinct annealing kinetics for the apatite fission track and (U–Th)/He methods using a predetermined thermal history. We then tested how well the true thermal history could be recovered under different data interpretation schemes and geologic constraint assumptions using the Bayesian QTQt software. Our results demonstrate that multikinetic data increase time–temperature resolution and can constrain complex thermal histories.
Birk Härtel, Raymond Jonckheere, Bastian Wauschkuhn, and Lothar Ratschbacher
Geochronology, 3, 259–272, https://doi.org/10.5194/gchron-3-259-2021, https://doi.org/10.5194/gchron-3-259-2021, 2021
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We carried out thermal annealing experiments between 500 and 1000 °C to determine the closure temperature of radiation-damage annealing in zircon (ZrSiO4). Our results show that the different Raman bands of zircon respond differently to annealing. The repair is highest for the external rotation Raman band near 356.6 cm−1. The closure temperature estimates range from 250 to 370 °C for different bands. The differences in closure temperatures offer the prospect of multi-T zircon Raman dating.
Pieter Vermeesch
Geochronology, 3, 247–257, https://doi.org/10.5194/gchron-3-247-2021, https://doi.org/10.5194/gchron-3-247-2021, 2021
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This paper shows that the current practice of filtering discordant U–Pb data based on the relative difference between the 206Pb/238U and 207Pb/206Pb ages is just one of several possible approaches to the problem and demonstrably not the best one. An alternative approach is to define discordance in terms of isotopic composition, as a log ratio distance between the measurement and the concordia line. Application to real data indicates that this reduces the positive bias of filtered age spectra.
Blair Schoene, Michael P. Eddy, C. Brenhin Keller, and Kyle M. Samperton
Geochronology, 3, 181–198, https://doi.org/10.5194/gchron-3-181-2021, https://doi.org/10.5194/gchron-3-181-2021, 2021
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We compare two published U–Pb and 40Ar / 39Ar geochronologic datasets to produce eruption rate models for the Deccan Traps large igneous province. Applying the same approach to each dataset, the resulting models agree well, but the higher-precision U–Pb dataset results in a more detailed eruption model than the lower-precision 40Ar / 39Ar data. We explore sources of geologic uncertainty and reiterate the importance of systematic uncertainties in comparing U–Pb and 40Ar / 39Ar datasets.
Nicholas P. McKay, Julien Emile-Geay, and Deborah Khider
Geochronology, 3, 149–169, https://doi.org/10.5194/gchron-3-149-2021, https://doi.org/10.5194/gchron-3-149-2021, 2021
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This paper describes geoChronR, an R package that streamlines the process of quantifying age uncertainties, propagating uncertainties through several common analyses, and visualizing the results. In addition to describing the structure and underlying theory of the package, we present five real-world use cases that illustrate common workflows in geoChronR. geoChronR is built on the Linked PaleoData framework, is open and extensible, and we welcome feedback and contributions from the community.
Roger Powell, Eleanor C. R. Green, Estephany Marillo Sialer, and Jon Woodhead
Geochronology, 2, 325–342, https://doi.org/10.5194/gchron-2-325-2020, https://doi.org/10.5194/gchron-2-325-2020, 2020
Short summary
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The standard approach to isochron calculation assumes that the distribution of uncertainties on the data arising from isotopic analysis is strictly Gaussian. This excludes datasets that have more scatter, even though many appear to have age significance. Our new approach requires only that the central part of the uncertainty distribution of the data defines a "spine" in the trend of the data. A robust statistics approach is used to locate the spine, and an implementation in Python is given.
Simon J. E. Large, Jörn-Frederik Wotzlaw, Marcel Guillong, Albrecht von Quadt, and Christoph A. Heinrich
Geochronology, 2, 209–230, https://doi.org/10.5194/gchron-2-209-2020, https://doi.org/10.5194/gchron-2-209-2020, 2020
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The integration of zircon geochemistry and U–Pb geochronology (petrochronology) allows us to improve our understanding of magmatic processes. Here we could reconstruct the ~300 kyr evolution of the magma reservoir that sourced the magmas, fluids and metals to form the Batu Hijau porphyry Cu–Au deposit. The application of in situ LA-ICP-MS and high-precision CA–ID–TIMS geochronology to the same zircons further allowed an assessment of the strengths and limitations of the different techniques.
Julia Kalanke, Jens Mingram, Stefan Lauterbach, Ryskul Usubaliev, Rik Tjallingii, and Achim Brauer
Geochronology, 2, 133–154, https://doi.org/10.5194/gchron-2-133-2020, https://doi.org/10.5194/gchron-2-133-2020, 2020
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Our study presents the first seasonally laminated (varved) sediment record covering almost the entire Holocene in high mountainous arid Central Asia. The established floating varve chronology is confirmed by two terrestrial radiocarbon dates, whereby aquatic radiocarbon dates reveal decreasing reservoir ages up core. Changes in seasonal deposition characteristics are attributed to changes in runoff and precipitation and/or to evaporative summer conditions.
Pieter Vermeesch
Geochronology, 2, 119–131, https://doi.org/10.5194/gchron-2-119-2020, https://doi.org/10.5194/gchron-2-119-2020, 2020
Short summary
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The U–Pb method is one of the most powerful and versatile methods in the geochronological toolbox. With two isotopes of uranium decaying to two different isotopes of lead, the U–Pb method offers an internal quality control that is absent from most other geochronological techniques. U-bearing minerals often contain significant amounts of Th, which decays to a third Pb isotope. This paper presents an algorithm to jointly process all three chronometers at once.
Jon Woodhead and Joseph Petrus
Geochronology, 1, 69–84, https://doi.org/10.5194/gchron-1-69-2019, https://doi.org/10.5194/gchron-1-69-2019, 2019
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Recently developed methods for in situ U–Pb age determination in carbonates have found widespread application, but the benefits and limitations of the method over bulk analysis approaches have yet to be fully explored. Here we use speleothems – cave carbonates such as stalagmites and flowstones – to investigate the utility of these in situ dating methodologies for challenging matrices with low U and Pb contents and predominantly late Cenozoic ages.
Cited articles
Adamiec, G. and Aitken, M.: Dose-rate conversion factors: update, Ancient TL,
16, 37–50, 1998.
Aitchison, J.: The statistical analysis of compositional data, Chapman and
Hall, London, New York, 1986.
Aitken, M. J.: Science-based Dating in Archaeology, Longman, London, New York, 1990.
Allen, J.: Holocene coastal lowlands in NW Europe?: autoeompaction and the
uncertain ground, in: Coastal and Estuarine Enviromnents: sedimentology,
geomorphology and geoarchaeolog, edited by: Pye, K. and Allen, J.,
The Geological Society of London, London, 239–252, 2000.
Alley, R. B., Marotzke, J., Nordhaus, W. D., Overpeck, J. T., Peteet, D. M.,
Pielke Jr., R. A., Pierrehumbert, R. T., Rhines, P. B., Stocker, T. F.,
Talley, L. D., and Wallace, J. M.: Abrupt Climate Change, Science,
299, 2005–2010, 2003.
Alloway, B. V., Lowe, D. J., Barrell, D. J. A., Newnham, R. M., Almond, P.
C., Augustinus, P. C., Bertler, N. A. N., Carter, L., Litchfield, N. J.,
McGlone, M. S., Shulmeister, J., Vandergoes, M. J., Williams, P. W., and
NZ-INTIMATE members: Towards a Climate Event Stratigraphy for New Zealand
over the past 30000 years (NZ-INTIMATE project), J. Quat. Sci., 22,
9–35, https://doi.org/10.1002/Jqs.1079, 2007.
Almond, P. C., Shanhun, F. L., Rieser, U., and Shulmeister, J.: An OSL, radiocarbon and tephra isochron-based chronology for Birdlings Flat loess at Ahuriri Quarry, Banks Peninsula, Canterbury, New Zealand, Quatern. Geochronol., 2, 4–8, https://doi.org/10.1016/j.quageo.2006.06.002, 2007.
Augustinus, P., Cochran, U., Kattel, G., D'Costa, D., and Shane, P.: Late
Quaternary paleolimnology of Onepoto maar, Auckland, New Zealand:
Implications for the drivers of regional paleoclimate, Quat. Int., 253,
18–31, https://doi.org/10.1016/j.quaint.2011.02.028, 2012.
Augustinus, P. C.: NZ-Maars: Extracting High Resolution Paleoclimate Records
from Maar Crater Lakes, Auckland, New Zealand, Past Clim. Dyn. A South.
Perspect., 15, 18–20, 2007.
Augustinus, P. C.: Probing the history of New Zealand's Orakei maar, EOS T. Am. Geophys. Un., 97, 1–7, https://doi.org/10.1029/2016EO059227,
2016.
Barrell, D. J. A., Almond, P. C., Vandergoes, M. J., Lowe, D. J., and
Newnham, R. M.: A composite pollen-based stratotype for inter-regional
evaluation of climatic events in New Zealand over the past 30 000 years
(NZ-INTIMATE project), Quat. Sci. Rev., 74, 4–20,
https://doi.org/10.1016/j.quascirev.2013.04.002, 2013.
Bird, M. I., Fifield, L. K., Chua, S., and Goh, B.: Calculating Sediment
Compaction For Radiocarbon Dating Of Intertidal Sediments, Radiocarbon,
46, 421–435, 2004.
Blaauw, M.: Methods and code for “classical” age-modelling of radiocarbon
sequences, Quat. Geochronol., 5, 512–518,
https://doi.org/10.1016/j.quageo.2010.01.002, 2010.
Blaauw, M.: Out of tune: The dangers of aligning proxy archives, Quat. Sci.
Rev., 36, 38–49, https://doi.org/10.1016/j.quascirev.2010.11.012, 2012.
Blaauw, M. and Christen, J. A.: Flexible paleoclimate age-depth models using
an autoregressive gamma process, Bayesian Anal., 6, 457–474,
https://doi.org/10.1214/11-BA618, 2011.
Blaauw, M. and Christen, J. A.: rbacon: Age-Depth Modelling using Bayesian Statistics, R package version 2.4.2, available at: https://CRAN.R-project.org/package=rbacon, last access: 14 December 2020.
Bleil, U. and Gard, G.: Chronology and correlation of Quaternary
magnetostratigraphy and nanno- fossil biostratigraphy in Norwegian-Greenland
Sea sediments, Geol. Rundschau, 78, 1173–1187, 1989.
Bøtter-Jensen, L.: Luminescence techniques: Instrumentation and methods,
Radiat. Meas., 27, 749–768, https://doi.org/10.1016/S1350-4487(97)00206-0, 1997.
Bøtter-Jensen, L., Mejdahl, V., and Murray, A. S.: New light on OSL, Quat.
Sci. Rev., 18, 303–309, https://doi.org/10.1016/S0277-3791(98)00063-8, 1999.
Bøtter-Jensen, L., Bulur, E., Duller, G. A. T., and Murray, A. S.:
Advances in luminescence measurement systems, Radiat. Meas., 32, 523–528, 2000.
Bourlès, D., Raisbeck, G. M., and Yiou, F.: 10Be and 9Be in marine sediments and their potential for dating, Geochim. Cosmochim. Act., 53, 443–452, 1989.
Broecker, W. S.: Does the Trigger for Abrupt Climate Change Reside in the
Ocean or in the Atmosphere?, Science, 300, 1519–1522, 2003.
Bronk Ramsey, C.: Bayesian Analysis of Radiocarbon Dates, Radiocarbon,
51, 337–360, https://doi.org/10.1017/S0033822200033865, 2009.
Buylaert, J. P., Jain, M., Murray, A. S., Thomsen, K. J., Thiel, C., and
Sohbati, R.: A robust feldspar luminescence dating method for Middle and
Late Pleistocene sediments, Boreas, 41, 435–451,
https://doi.org/10.1111/j.1502-3885.2012.00248.x, 2012.
Carolin, S. A., Cobb, K. M., Adkins, J. F., Clark, B., Conroy, J. L., Lejau,
S., Malang, J.. and Tuen, A. A.: Varied Response of Western Pacific Hydrology
to Climate Forcings over the Last Glacial Period, Science, 340,
1564–1567, 2013.
Cassata, W. S., Singer, B. S., and Cassidy, J.: Laschamp and Mono Lake
geomagnetic excursions recorded in New Zealand, Earth Planet. Sc. Lett.,
268, 76–88, https://doi.org/10.1016/j.epsl.2008.01.009, 2008.
Channell, J. E. T., Hodell, D. A., and Lehman, B.: Relative geomagnetic
paleointensity and δ18O at ODP Site 983 (Gardar Drift, North
Atlantic) since 350 ka, Earth Planet. Sc. Lett., 153, 103–118, 1997.
Channell, J. E. T., Stoner, J. S., Hodell, D. A., and Charles, C. D.:
Geomagnetic paleointensity for the last 100 kyr from the sub-antarctic South
Atlantic: a tool for inter-hemispheric correlation, Earth Planet. Sc.
Lett., 175, 145–160, 2000.
Channell, J. E. T., Xuan, C., and Hodell, D. A.: Stacking paleointensity and
oxygen isotope data for the last 1.5 Myr (PISO-1500), Earth Planet. Sc.
Lett., 283, 14–23, https://doi.org/10.1016/j.epsl.2009.03.012, 2009.
Child, D., Elliott, G., Mifsud, C., Smith, A. M., and Fink, D.: Sample
processing for earth science studies at ANTARES, Nucl. Instruments Methods
Phys. Res. B, 172, 856–860, 2000.
Christen, J. A. and Pérez E, S.: A New Robust Statistical Model for
Radiocarbon Data, Radiocarbon, 51, 1047–1059,
https://doi.org/10.1017/s003382220003410x, 2009.
Christl, M., Vockenhuber, C., Kubik, P. W., Wacker, L., Lachner, J.,
Alfimov, V., Synal, H.-A., and Synal, H.: The ETH Zurich AMS facilities:
Performance parameters and reference materials, Nucl. Inst. Methods Phys.
Res. B, 294, 29–38, https://doi.org/10.1016/j.nimb.2012.03.004, 2013.
Czymzik, M., Muscheler, R., Brauer, A., Adolphi, F., Ott, F., Kienel, U.,
Dräger, N., Słowiński, M., Aldahan, A., and Possnert, G.: Solar
cycles and depositional processes in annual 10Be from two varved lake
sediment records, Earth Planet. Sc. Lett., 428, 44–51,
https://doi.org/10.1016/j.epsl.2015.07.037, 2015.
Danišík, M., Shane, P., Schmitt, A. K., Hogg, A., Santos, G. M.,
Storm, S., Evans, N. J., Keith Fifield, L., and Lindsay, J. M.: Re-anchoring
the late Pleistocene tephrochronology of New Zealand based on concordant
radiocarbon ages and combined 238U/230Th disequilibrium and (U-Th) ∕ He zircon
ages, Earth Planet. Sc. Lett., 349–350, 240–250,
https://doi.org/10.1016/j.epsl.2012.06.041, 2012.
Danišík, M., Lowe, D. J., Schmitt, A. K., Friedrichs, B., Hogg, A.
G., and Evans, N. J.: Sub-millennial eruptive recurrence in the silicic
Mangaone Subgroup tephra sequence , New Zealand , from Bayesian modelling of
zircon double-dating and radiocarbon ages, Quat. Sci. Rev., 246, 106517,
https://doi.org/10.1016/j.quascirev.2020.106517, 2020.
Doerschner, N., Hernandez, M., and Fitzsimmons, K. E.: Sources of variability
in single grain dose recovery experiments: Insights from Moroccan and
Australian samples, Ancient TL, 34, 14–25, 2016.
Dunbar, N. W., Iverson, N. A., Van Eaton, A. R., Sigl, M., Alloway, B. V.,
Kurbatov, A. V., Mastin, L. G., McConnell, J. R., and Wilson, C. J. N.: New
Zealand supereruption provides time marker for the Last Glacial Maximum in
Antarctica, Sci. Rep., 7, 3–10, https://doi.org/10.1038/s41598-017-11758-0, 2017.
Egli, R.: Characterization of individual rock magnetic components by
analysis of remanence curves, 1. Unmixing natural sediments, Stud. Geophys.
Geod., 48, 391–446, 2004.
Elsasser, W., Ney, E. P., and Winckler, J. R.: Cosmic-Ray intensity and
geomagnetism, Nature, 178, 1226–1227, 1956.
EPICA Community Members: One-to-one coupling of glacial climate variability
in Greenland and Antarctica, Nature, 444, 195–198,
https://doi.org/10.1038/nature05301, 2006.
Fink, D., Hotchkis, M., Hua, Q., Jacobsen, G., Smith, A. M., Zoppi, U.,
Child, D., Mifsud, C., Van Der Gaast, H., Williams, A., and Williams, M.: The
ANTARES AMS facility at ANSTO, Nucl. Instruments Methods Phys. Res. B,
223–224, 109–115, https://doi.org/10.1016/j.nimb.2004.04.025, 2004.
Flude, S. and Storey, M.: 40Ar ∕ 39Ar age of the Rotoiti Breccia and Rotoehu
Ash, Okataina Volcanic Complex, New Zealand, and identification of
heterogeneously distributed excess40Ar in supercooled crystals, Quat.
Geochronol., 33, 13–23, https://doi.org/10.1016/j.quageo.2016.01.002, 2016.
Fox, J. and Weisberg, S.: An R Companion to Applied Regression, 2nd edn.,
SAGE Publications, Thousand Oaks, California, USA, 2011.
Frank, M., Schwarz, B., Baumann, S., Kubik, P. W., Suter, M., and Mangini,
A.: A 200 kyr record of cosmogenic radionuclide production rate and
geomagnetic field intensity from 10Be in globally stacked deep-sea
sediments, Earth Planet. Sc. Lett., 149, 121–129,
https://doi.org/10.1016/S0012-821X(97)00070-8, 1997.
Frank, M., Backman, J., Jakobsson, M., Moran, K., Regan, M. O., King, J.,
Haley, B. A., Kubik, P. W., and Garbe-Schönberg, D.: Beryllium isotopes
in central Arctic Ocean sediments over the past 12.3 million years:
Stratigraphic and paleoclimatic implications, Paleoceanography, 23, 1–12,
https://doi.org/10.1029/2007PA001478, 2008.
Froggatt, P. C. and Lowe, D. J.: A review of late quaternary silicic and
some other tephra formations from New Zealand: Their stratigraphy,
nomenclature, distribution, volume, and age, New Zeal. J. Geol. Geophys.,
33, 89–109, https://doi.org/10.1080/00288306.1990.10427576, 1990.
Galbraith, R. F., Roberts, R. G., Laslett, G. M., Yoshida, H., and Olley, J.
M.: Optical Dating of Single and Multiple Grains of Quartz From Jinmium Rock
Shelter, Northern Australia: Part I, Experimental Design and Statistical
Models, Archaeometry, 41, 339–364, 1999.
Giorgino, T.: Computing and Visualizing Dynamic Time Warping Alignments in this reference of Giorgino 2009: The dtw Package, J. Stat. Softw., 31, 1–24, 2009.
Guerin, G., Mercier, N., and Adamiec, G.: Dose-rate conversion factors:
update, Ancient TL, 29, 5–8, 2011.
Hagen, C. J., Reilly, B. T., Stoner, J. S., and Creveling, J. R.: Dynamic
Time Warping of Paleomagnetic Secular Variation Data, Geophys. J. Int.,
1–45, 2020.
Hatfield, R. G., Stoner, J. S., Solada, K. E., Morey, A. E., Woods, A.,
Chen, C. Y., McGee, D., Abbott, M. B., and Rodbell, D. T.: Paleomagnetic
Constraint of the Brunhes Age Sedimentary Record From Lake Junín, Peru,
Front. Earth Sci., 8, 1–18, https://doi.org/10.3389/feart.2020.00147, 2020.
Hay, C. C., Creveling, J. R., Hagen, C. J., Maloof, A. C., and Huybers, P.: A
library of early Cambrian chemostratigraphic correlations from a
reproducible algorithm, Geology, 47, 457–460, 2019.
Hayward, B. W., Morley, M. S., Sabaa, A. T., Grenfell, H. R., Daymond-King,
R., Molloy, C., Shane, P. A., and Augustinus, P. A.: Fossil Record Of The
Post-Glacial Marine Breaching Of Auckland's Volcanic Maar Craters, Rec.
Auckl. Museum, 45, 79–99, 2008.
Hayward, C. M. and Hayward, B. W.: Human Impact On Orakei Basin, Auckland,
Tane, 37, 137–152, 1999.
Heiken, G.: Morphology and Petrography of Volcanic Ashes, Geol. Soc. Am.
Bull., 83, 1961–1988, 1972.
Hessell, J. W. D.: The climate and weather of the Auckland region, New Zealand Meteorological Service,
1988.
Hogg, A. G., Heaton, T. J., Hua, Q., Palmer, J. G., Turney, C. S. M.,
Southon, J., Bayliss, A., Blackwell, P. G., Boswijk, G., Bronk Ramsey, C.,
Pearson, C., Petchey, F., Reimer, P., Reimer, R., and Wacker, L.: Shcal20
Southern Hemisphere Calibration, 0–55 000 YEARS CAL BP, Radiocarbon, 62,
759–778, https://doi.org/10.1017/RDC.2020.59, 2020.
Hopkins, J. L., Millet, M. A., Timm, C., Wilson, C. J. N., Leonard, G. S.,
Palin, J. M., and Neil, H.: Tools and techniques for developing tephra
stratigraphies in lake cores: A case study from the basaltic Auckland
Volcanic Field, New Zealand, Quat. Sci. Rev., 123, 58–75,
https://doi.org/10.1016/j.quascirev.2015.06.014, 2015.
Hopkins, J. L., Wilson, C. J. N., Millet, M. A., Leonard, G. S., Timm, C.,
McGee, L. E., Smith, I. E. M., and Smith, E. G. C.: Multi-criteria
correlation of tephra deposits to source centres applied in the Auckland
Volcanic Field, New Zealand, Bull. Volcanol., 79, 55,
https://doi.org/10.1007/s00445-017-1131-y, 2017.
Hurnard, S. M.: Auckland's climate, in: Natural History of Auckland: an
Introduction, edited by: Brook, P. J., Auckland Institute and
Museum, Auckland, 31–34, 1979.
Ingham, E., Turner, G. M., Conway, C. E., Heslop, D., Roberts, A. P.,
Leonard, G., Townsend, D., and Calvert, A.: Volcanic records of the Laschamp
geomagnetic excursion from Mt Ruapehu, New Zealand, Earth Planet. Sc. Lett., 472, 131–141, https://doi.org/10.1016/j.epsl.2017.05.023, 2017.
Kemp, C. W., Tibby, J., Arnold, L. J., Barr, C., Gadd, P. S., Marshall, J.
C., Mcgregor, G. B., and Jacobsen, G. E.: Climates of the last three
interglacials in subtropical eastern Australia inferred from wetland
sediment geochemistry, Palaeogeogr. Palaeoclimatol. Palaeoecol.,
538, 109463, https://doi.org/10.1016/j.palaeo.2019.109463, 2020.
Kidson, J. W.: An Analysis of New Zealand Synoptic Types and Their Use in
Defining Weather Regimes, Int. J. Climatol., 20, 299–316, 2000.
King, R. F.: The Remanent Magnetism Of Artificially Deposited Sediments,
eophysical Supplements to the Monthly Notices of the Royal Astronomical Society, 7, 115–134,
https://doi.org/10.1111/j.1365-246X.1955.tb06558.x, 1955.
Kirschvink, J. L.: The least-squares line and plane and the analysis of
palaeomagnetic data, Geophys. J. Int., 62, 699–718, 1980.
Laj, C. and Channell, J. E. T.: Geomagnetic Excursions, in: Treatise on
Geophysics, Elsevier B.V., 343–383, 2015.
Laj, C., Kissel, C., and Beer, J.: High Resolution Global Paleointensity
Stack Since 75 kyr (GLOPIS-75) Calibrated to Absolute Values, in: Timescales
of the paleomagnetic field, vol. 145, edited by: Channell, J. E. T.,
Kent, D. V., Lowrie, W., and Meert, J. G., American Geophysical Union,
Washington, DC, 255–265, 2004.
Laj, C., Guillou, H., and Kissel, C.: Dynamics of the earth magnetic field in
the 10–75 kyr period comprising the Laschamp and Mono Lake excursions: New
results from the French Chaîne des Puys in a global perspective, Earth Planet. Sc. Lett., 387, 184–197, https://doi.org/10.1016/j.epsl.2013.11.031, 2014.
Lascu, I., Feinberg, J. M., Dorale, J. A., Cheng, H., and Edwards, R. L.: Age
of the Laschamp excursion determined by U-Th dating of a speleothem
geomagnetic record from North America, Geology, 44, 139–142,
https://doi.org/10.1130/G37490.1, 2016.
Leonard, G. S., Calvert, A. T., Hopkins, J. L., Wilson, C. J. N., Smid, E.
R., Lindsay, J. M., and Champion, D. E.: High-precision 40Ar ∕ 39Ar dating of
Quaternary basalts from Auckland Volcanic Field, New Zealand, with
implications for eruption rates and paleomagnetic correlations, J. Volcanol.
Geotherm. Res., 343, 60–74, https://doi.org/10.1016/j.jvolgeores.2017.05.033, 2017.
Lézine, A., Grafenstein, U. Von, Andersen, N., Belmecheri, S., Bordon,
A., Caron, B., and Cazet, J.: Lake Ohrid, Albania, provides an exceptional
multi-proxy record of environmental changes during the last glacial –
interglacial cycle, Palaeogeogr. Palaeoclimatol. Palaeoecol., 287, 116–127,
https://doi.org/10.1016/j.palaeo.2010.01.016, 2010.
Lindsay, J., Leonard, G., Smid, E., and Hayward, B.: Age of the Auckland
Volcanic Field: a review of existing data, New Zeal. J. Geol. Geophys.,
54, 379–401, https://doi.org/10.1080/00288306.2011.595805, 2011.
Liu, E. J., Cashman, K. V., and Rust, A. C.: Optimising shape analysis to
quantify volcanic ash morphology, GeoResJ, 8, 14–30,
https://doi.org/10.1016/j.grj.2015.09.001, 2015.
Liu, J., Nowaczyk, N. R., Panovska, S., Korte, M., and Arz, H. W.: The
Norwegian-Greenland Sea, the Laschamps, and the Mono Lake Excursions
Recorded in a Black Sea Sedimentary Sequence, J. Geophys. Res.-Sol. Ea.,
125, 1–22, https://doi.org/10.1029/2019JB019225, 2020.
Loame, R. C., Villamor, P., Lowe, D. J., Milicich, S. D., Pittari, A.,
Barker, S. L. L., Rae, A., Gomez-vasconcelos, M. G., Martinez-Martos, M., and Ries,
W. F.: Using paleoseismology and tephrochronology to reconstruct fault
rupturing and hydrothermal activity since ca. 40 ka in Taupo Rift, New
Zealand, Quat. Int., 500, 52–70, https://doi.org/10.1016/j.quaint.2019.02.031, 2019.
Løvlie, R.: Palaeomagnetic excursions during the last
interglacial/glacial cycle: A synthesis, Quat. Int., 3/4, 5–11, 1989.
Lowe, D. J.: Tephrochronology and its application: A review, Quat.
Geochronol., 6, 107–153, https://doi.org/10.1016/j.quageo.2010.08.003, 2011.
Lowe, D. J., Blaauw, M., Hogg, A. G., and Newnham, R. M.: Ages of 24
widespread tephras erupted since 30 000 years ago in New Zealand, with
re-evaluation of the timing and palaeoclimatic implications of the
Lateglacial cool episode recorded at Kaipo bog, Quat. Sci. Rev., 74,
170–194, https://doi.org/10.1016/j.quascirev.2012.11.022, 2013.
Lowick, S. E. and Preusser, F.: A method for retrospectively calculating the
water content for silt-dominated desiccated core samples, Ancient TL, 27,
9–14, 2009.
Lund, S., Schwartz, M., and Stott, L.: Long-term palaeomagnetic secular
variation and excursions from the western Equatorial Pacific Ocean (MIS2-4),
Geophys. J. Int., 209, 587–596, https://doi.org/10.1093/gji/ggx029, 2017.
Mauz, B. and Lang, A.: Removal of the feldspar-derived luminescence
component from polymineral fine silt samples for optical dating
applications: evaluation of chemical treatment protocols and quality control
procedures, Ancient TL, 22, 1–8, 2004.
McHargue, L. R., Damon, P. E., and Donahue, D. J.: Enhanced cosmic-ray
production of 10Be coincident with the Mono Lake and Laschamp Geomagnetic
Excursions, Geophys. Res. Lett., 22, 659–662, https://doi.org/10.1029/95GL00169,
1995.
Mejdahl, V.: Thermoluminescence Dating: Beta-Dose Attenuation in Quartz
Grains, Archaeometry, 21, 61–72, 1979.
Ménabréaz, L., Thouveny, N., Bourlès, D. L., Deschamps, P.,
Hamelin, B., and Demory, F.: The Laschamp geomagnetic dipole low expressed as
a cosmogenic 10Be atmospheric overproduction at ∼ 41 ka, Earth Planet. Sc. Lett., 312, 305–317, https://doi.org/10.1016/j.epsl.2011.10.037,
2011.
Mochizuki, N., Tsunakawa, H., Shibuya, H., Cassidy, J., and Smith, I. E. M.:
Palaeointensities of the Auckland geomagnetic excursions by the LTD-DHT Shaw
method, Phys. Earth Planet. Int., 154, 168–179,
https://doi.org/10.1016/j.pepi.2005.09.005, 2006.
Molloy, C., Shane, P., and Augustinus, P.: Eruption recurrence rates in a
basaltic volcanic field based on tephralayers in maar sediments:
Implications for hazards in the Auckland volcanic field, Bull. Geol. Soc.
Am., 121, 1666–1677, https://doi.org/10.1130/B26447.1, 2009.
Muscheler, R., Beer, J., Kubik, P. W., and Synal, H.-A.: Geomagnetic field
intensity during the last 60 000 years based on 10Be and 36Cl from the
Summit ice cores and 14C, Quat. Sci. Rev., 24, 1849–1860,
https://doi.org/10.1016/j.quascirev.2005.01.012, 2005.
Needham, A. J., Lindsay, J. M., Smith, I. E. M., Augustinus, P., and Shane,
P. A.: Sequential eruption of alkaline and sub-alkaline magmas from a small
monogenetic volcano in the Auckland Volcanic Field, New Zealand, J.
Volcanol. Geotherm. Res., 201, 126–142,
https://doi.org/10.1016/j.jvolgeores.2010.07.017, 2011.
Newnham, R., Lowe, D. J., Gehrels, M., and Augustinus, P.: Two-step human–environmental impact history for northern New Zealand linked to
late-Holocene climate change, Holocene, 28, 1093–1106, 2018.
NGRIP Members: High-resolution record of Northern Hemisphere climate
extending into the last interglacial period, Nature, 431, 147–151,
2004.
Nilsson, A., Muscheler, R., Snowball, I., Aldahan, A., Possnert, G.,
Augustinus, P., Atkin, D., and Stephens, T.: Multi-proxy identification of
the Laschamp geomagnetic field excursion in Lake Pupuke, New Zealand, Earth Planet. Sc. Lett., 311, 155–164, https://doi.org/10.1016/j.epsl.2011.08.050,
2011.
Nishiizumi, K., Imamura, M., Caffee, M. W., Southon, J. R., Finkel, R. C.,
and Mcaninch, J.: Absolute calibration of 10Be AMS standards Kunihiko, Nucl.
Instruments Methods Phys. Res. B, 258, 403–413,
https://doi.org/10.1016/j.nimb.2007.01.297, 2007.
Nowaczyk, N. R. and Baumann, M.: Combined high-resolution
magnetostratigraphy and nannofossil biostratigraphy for late Quaternary
Arctic Ocean sediments, Deep-Sea Res., 39, S567–S601, 1992.
Nowaczyk, N. R. and Frederichs, T. W.: Geomagnetic events and relative
palaeointensity variations during the past 300 ka as recorded in Kolbeinsey
Ridge sediments, Iceland Sea?: indication for a strongly variable
geomagnetic field, Int. J. Earth Sci., 88, 116–131, 1999.
Nowaczyk, N. R., Frederichs, T. W., Eisenhauer, A., and Gard, G.:
Magnetostratigraphic data from late Quaternary sediments from the Yermak
Plateau , Arctic Ocean: evidence for four geomagnetic polarity events within
the last 170 Ka of the Brunhes Chron, Geophys. J. Int., 117, 453–471, 1994.
Nowaczyk, N. R., Antonow, M., Knies, J., and Spielhagen, R. F.: Further rock
magnetic and chronostratigraphic results on reversal excursions during the
last 50 ka as derived from northern high latitudes and discrepancies in
precise AMS 14C dating, Geophys. J. Int., 155, 1065–1080, 2003.
Nowaczyk, N. R., Frank, U., Kind, J., and Arz, H. W.: A high-resolution
paleointensity stack of the past 14 to 68 ka from Black Sea sediments, Earth Planet. Sc. Lett., 384, 1–16, https://doi.org/10.1016/j.epsl.2013.09.028, 2013.
Olley, J. M., Pietsch, T., and Roberts, R. G.: Optical dating of Holocene
sediments from a variety of geomorphic settings using single grains of
quartz, Geomorphology, 60, 337–358,
https://doi.org/10.1016/j.geomorph.2003.09.020, 2004.
Osete, M.-L., Martin-Chivelet, J., Rossi, C., Edwards, R. L., Egli, R.,
Munoz-Garcia, M. B., Wang, X., Pavon-Carrasco, F. J., and Heller, F.: The
Blake geomagnetic excursion recorded in a radiometrically dated speleothem,
Earth Planet. Sc. Lett., 353–354, 173–181,
https://doi.org/10.1016/j.epsl.2012.07.041, 2012.
Pepper, A. C., Shulmeister, J., Nobes, D. C., and Augustinus, P. A.: Possible
ENSO signals prior to the Last Glacial Maximum, during the last deglaciation
and the early Holocene, from New Zealand, Geophys. Res. Lett., 31, 1–4,
https://doi.org/10.1029/2004GL020236, 2004.
Peters, C. and Thompson, R.: Magnetic identification of selected natural
iron oxides and sulphides, J. Magn. Magn. Mater., 183, 365–374, 1998.
Peti, L. and Augustinus, P. C.: Stratigraphy and sedimentology of the Orakei
maar lake sediment sequence (Auckland Volcanic Field , New Zealand), Sci.
Drill., 25, 47–56, 2019.
Peti, L., Gadd, P. S., Hopkins, J. L., and Augustinus, P. C.: Itrax μ-XRF core scanning for rapid tephrostratigraphic analysis: a case study
from the Auckland Volcanic Field maar lakes, J. Quat. Sci., 1–12,
https://doi.org/10.1002/jqs.3133, 2019.
Peti, L., Nilsson, A., Muscheler, R., Fitzsimmons, K. E., Fink, D., Fujioka, T., Mifsud, C., Hopkins, J. L., Christl, M., andAugustinus, P. C.: Beryllium-10 in sediment cores OB16A and OB16B from Orakei maar, Auckland, New Zealand, PANGAEA, https://doi.org/10.1594/PANGAEA.920773, 2020a.
Peti, L., Nilsson, A., Muscheler, R., Fitzsimmons, K. E., Fink, D., Fujioka, T., Mifsud, C., Hopkins, J. L., Christl, M., andAugustinus, P. C.: Rhyolitic tephra composition in sediment cores OB16A and OB16B from Orakei maar, Auckland, New Zealand, PANGAEA, https://doi.org/10.1594/PANGAEA.921121, 2020b.
Peti, L., Nilsson, A., Muscheler, R., Fitzsimmons, K. E., Fink, D., Fujioka, T., Mifsud, C., Hopkins, J. L., Christl, M., andAugustinus, P. C.: Basaltic tephra composition in sediment cores OB16A and OB16B from Orakei maar, Auckland, New Zealand, PANGAEA, https://doi.org/10.1594/PANGAEA.921122, 2020c.
Peti, L., Nilsson, A., Muscheler, R., Fitzsimmons, K. E., Fink, D., Fujioka, T., Mifsud, C., Hopkins, J. L., Christl, M., and Augustinus, P. C.: Paleomagnetic data from sediment cores OB16A and OB16B from Orakei maar, Auckland, New Zealand, PANGAEA, https://doi.org/10.1594/PANGAEA.921134, 2020d.
Philippsen, B.: The freshwater reservoir effect in radiocarbon dating,
Herit. Sci., 1, 1–19, https://doi.org/10.1186/2050-7445-1-24, 2013.
Pickarski, N., Kwiecien, O., Djamali, M., and Litt, T.: Vegetation and
environmental changes during the last interglacial in eastern Anatolia (Turkey): a new high-resolution pollen record from Lake Van, Palaeogeogr.
Palaeoclimatol. Palaeoecol., 435, 145–158,
https://doi.org/10.1016/j.palaeo.2015.06.015, 2015.
Prescott, J. R. and Hutton, J. T.: Cosmic ray contributions to dose rates
for luminescence and ESR dating: Large depths and long-term time variations,
Radiat. Meas., 23, 497–500, https://doi.org/10.1016/1350-4487(94)90086-8, 1994.
R Core Team: R: A Language and Environment for Statistical Computing, R
Foundation for Statistical Computing, Vienna, Austria, available
at: https://www.r-project.org, last access: 30 October 2020.
Rasmussen, S. O., Bigler, M., Blockley, S. P., Blunier, T., Buchardt, S. L.,
Clausen, H. B., Cvijanovic, I., Dahl-Jensen, D., Johnsen, S. J., Fischer,
H., Gkinis, V., Guillevic, M., Hoek, W. Z., Lowe, J. J., Pedro, J. B., Popp,
T., Seierstad, I. K., Peder Steffensen, J., Svensson, A. M., Vallelonga, P.,
Vinther, B. M., Walker, M. J. C., Wheatley, J. J., and Winstrup, M.: A
stratigraphic framework for abrupt climatic changes during the Last Glacial
period based on three synchronized Greenland ice-core records: refining and
extending the INTIMATE event stratigraphy, Quat. Sci. Rev., 106, 14–28,
https://doi.org/10.1016/j.quascirev.2014.09.007, 2014.
Rees-Jones, J.: Optical dating of young sediments using fine-grain quartz,
Ancient TL, 13, 9–14, 1995.
Rees-Jones, J. and Tite, M. S.: Optical Dating Results for British
Archaeological Sediments, Archaeometry, 39, 177–187,
https://doi.org/10.1111/j.1475-4754.1997.tb00797.x, 1997.
Roberts, H. M., Bryant, C. L., Huws, D. G., and Lamb, H. F.: Generating long chronologies for lacustrine sediments using luminescence dating: a 250,000 year record from Lake Tana, Ethiopia, Quaternary Sci. Rev., 202, 66–77, https://doi.org/10.1016/j.quascirev.2018.10.037, 2018.
Roperch, P., Bonhommet, N., and Levi, S.: Paleointensity of the earth's
magnetic field during the Laschamp excursion and its geomagnetic
implications, Earth Planet. Sc. Lett., 88, 209–219, 1988.
Seelos, K., Sirocko, F., and Dietrich, S.: A continuous high-resolution dust
record for the reconstruction of wind systems in central Europe (Eifel,
Western Germany) over the past 133 ka, Geophys. Res. Lett., 36, L20712,
https://doi.org/10.1029/2009GL039716, 2009.
Shanahan, T. M., Overpeck, J. T., Anchukaitis, K. J., Beck, J. W., Cole, J.
E., Dettman, D. L., Peck, J. A., Scholz, C. A., and King, J. W.: Atlantic
Forcing of Persistent Drought in West Africa, Science, 324,
377–380, 2009.
Shane, P.: Tephrochronology: a New Zealand case study,
Earth-Sci. Rev., 49, 223–259, 2000.
Shane, P. and Hoverd, J.: Distal record of multi-sourced tephra in Onepoto Basin, Auckland, New Zealand: Implications for volcanic chronology, frequency and hazards, Bull. Volcanol., 64, 441–454, 2002.
Shane, P. and Sandiford, A.: Paleovegetation of marine isotope stages 4 and
3 in Northern New Zealand and the age of the widespread Rotoehu tephra,
Quat. Res., 59, 420–429, https://doi.org/10.1016/S0033-5894(03)00044-9, 2003.
Simon, Q., St-Onge, G., and Hillaire-Marcel, C.: Late Quaternary
chronostratigraphic framework of deep Baffin Bay glaciomarine sediments from
high-resolution paleomagnetic data, Geochem. Geophy. Geosy.,
13, 1–24, 2012.
Simon, Q., Bourlès, D. L., Bassinot, F., Nomade, S., Marino, M.,
Ciaranfi, N., Girone, A., Maiorano, P., Thouveny, N., Choy, S., Dewilde, F.,
Scao, V., Isguder, G., and Blamart, D.: Authigenic 10Be/9Be ratio signature
of the Matuyama–Brunhes boundary in the Montalbano Jonico marine
succession, Earth Planet. Sc. Lett., 460, 255–267,
https://doi.org/10.1016/j.epsl.2016.11.052, 2016.
Simon, Q., Ledru, M.-P., Oliveira Sawakuchi, A., Favier, C., Mineli, T. D.,
Grohmann, C. H., Guedes, M., Bard, E., Thouveny, N., Garcia, M., Tachikawa,
K., Rodríguez-Zorro, P. A., and ASTER Team: Chronostratigraphy of a
1.5 ± 0.1 Ma composite sedimentary record from Colônia basin (SE
Brazil): Bayesian modeling based on paleomagnetic, authigenic 10Be/9Be, radiocarbon and luminescence dating, Quat. Geochronol., 58, 101081, https://doi.org/10.1016/j.quageo.2020.101081, 2020a.
Simon, Q., Thouveny, N., Bourlès, D. L., and Valet, J.: Cosmogenic 10Be production records reveal dynamics of geomagnetic dipole moment (GDM) over the Laschamp excursion (20–60 ka), Earth Planet. Sc. Lett., 550,
116547, https://doi.org/10.1016/j.epsl.2020.116547, 2020b.
Smith, J. D. and Foster, J. H.: Geomagnetic Reversal in Brunhes Normal
Polarity Epoch, Science, 163,
565–567, 1969.
Stanley, D. J. and Hait, A. K.: Deltas, radiocarbon dating, and measurements
of sediment storage and subsidence, Geology, 28, 295–298, 2000.
Stanton, T., Nilsson, A., Snowball, I., and Muscheler, R.: Assessing the
reliability of Holocene relative palaeointensity estimates: a case study
from Swedish varved lake sediments, Geophys. J. Int., 187, 1195–1214,
https://doi.org/10.1111/j.1365-246X.2011.05049.x, 2011.
Stephens, T., Atkin, D., Cochran, U., Augustinus, P., Reid, M., Lorrey, A.,
Shane, P., and Street-Perrott, A.: A diatom-inferred record of reduced
effective precipitation during the Last Glacial Coldest Phase (28.8–18.0 cal kyr BP) and increasing Holocene seasonality at Lake Pupuke, Auckland, New
Zealand, J. Paleolimnol., 48, 801–817, https://doi.org/10.1007/s10933-012-9645-y,
2012.
Stockhecke, M., Kwiecien, O., Vigliotti, L., Anselmetti, F. S., Beer, J.,
Çağatay, M. N., Channell, J. E. T., Kipfer, R., Lachner, J., Litt,
T., Pickarski, N., and Sturm, M.: Chronostratigraphy of the 600 000 year old
continental record of Lake Van (Turkey), Quat. Sci. Rev., 104, 8–17,
https://doi.org/10.1016/j.quascirev.2014.04.008, 2014.
Tauxe, L.: Sedimentary records of relative paleointensity of the geomagnetic
field: Theory and practice, Rev. Geophys., 31, 319–354, 1993.
Thiel, C., Buylaert, J. P., Murray, A., Terhorst, B., Hofer, I., Tsukamoto,
S., and Frechen, M.: Luminescence dating of the Stratzing loess profile
(Austria) – Testing the potential of an elevated temperature post-IR IRSL
protocol, Quat. Int., 234, 23–31, https://doi.org/10.1016/j.quaint.2010.05.018,
2011.
Thiel, C., Horváth, E., and Frechen, M.: Revisiting the loess/palaeosol
sequence in Paks, Hungary: A post-IR IRSL based chronology for the “Young
Loess Series”, Quat. Int., 319, 88–98, https://doi.org/10.1016/j.quaint.2013.05.045,
2014.
Thompson, R. and Oldfield, F.: Environmental magnetism, 1st edn., Allen &
Unwin, London, 1986.
Thouveny, N., Carcaillet, J., Moreno, E., Leduc, G., and Nérini, D.:
Geomagnetic moment variation and paleomagnetic excursions since 400 kyr BP:
a stacked record from sedimentary sequences of the Portuguese margin, Earth Planet. Sc. Lett., 219, 377–396, https://doi.org/10.1016/S0012-821X(03)00701-5, 2004.
Tric, E., Laj, C., Valet, J. P., Tucholka, P., Paterne, M., and Guichard, F.:
The Blake geomagnetic event: transition geometry, dynamical characteristics
and geomagnetic significance, Earth Planet. Sc. Lett., 102, 1–13,
https://doi.org/10.1016/0012-821X(91)90013-8, 1991.
Valet, J.-P. and Meynadier, L.: A comparison of different techniques for
relative paleointensity, Geophys. Res. Lett., 25, 89–92, 1998.
van den Boogaart, K. G., Tolosana-Delgado, R., and Bren, M.: compositions:
Compositional Data Analysis R package version 1.40-2, available
at: https://cran.r-project.org/package=compositions (last access: 10 July 2020), 2018.
Vandergoes, M. J., Newnham, R. M., Preusser, F., Hendy, C. H., Lowell, T. V,
Fitzsimons, S. J., Hogg, A. G., Kasper, H. U., and Schluchter, C.: Regional
insolation forcing of late Quaternary climate change in the Southern
Hemisphere, Nature, 436, 242–245, https://doi.org/10.1038/nature03826, 2005.
Vandergoes, M. J., Hogg, A. G., Lowe, D. J., Newnham, R. M., Denton, G. H.,
Southon, J., Barrell, D. J. A., Wilson, C. J. N., McGlone, M. S., Allan, A.
S. R., Almond, P. C., Petchey, F., Dabell, K., Dieffenbacher-Krall, A. C.,
and Blaauw, M.: A revised age for the Kawakawa/Oruanui tephra, a key marker
for the Last Glacial Maximum in New Zealand, Quat. Sci. Rev., 74, 195–201,
https://doi.org/10.1016/j.quascirev.2012.11.006, 2013.
Wagner, G., Masarik, J., Beer, J., Baumgartner, S., Imboden, D., Kubik, P.
W., Synal, H.-A., and Suter, M.: Reconstruction of the geomagnetic field
between 20 and 60 kyr BP from cosmogenic radionuclides in the GRIP ice core,
Nucl. Instruments Methods Phys. Res. Sect. B Beam Interact. with Mater.
Atoms, 172, 597–604, https://doi.org/10.1016/S0168-583X(00)00285-8, 2000.
White, D. A., Fink, D., Post, A. L., Simon, K., Galton-Fenzi, B., Foster,
S., Fujioka, T., Jeromson, M. R., Blaxell, M., and Yokoyama, Y.: Beryllium
isotope signatures of ice shelves and sub-ice shelf circulation, Earth Planet. Sc. Lett., 505, 86–95, 2019.
Wilcken, K. M., Fujioka, T., Fink, D., Fülöp, R. H., Codilean, A.
T., Simon, K., Mifsud, C., and Kotevski, S.: SIRIUS Performance: 10Be, 26Al
and 36Cl measurements at ANSTO, Nucl. Inst . Methods Phys. Res. B,
455, 300–304, https://doi.org/10.1016/j.nimb.2019.02.009, 2019.
Willenbring, J. K. and von Blanckenburg, F.: Meteoric cosmogenic
Beryllium-10 adsorbed to river sediment and soil: Applications for
Earth-surface dynamics, Earth-Sci. Rev., 98, 105–122,
https://doi.org/10.1016/j.earscirev.2009.10.008, 2010.
Wittmann, H., Blanckenburg, F. Von, Bouchez, J., Dannhaus, N., Naumann, R.,
Christl, M., and Gaillardet, J.: The dependence of meteoric 10Be
concentrations on particle size in Amazon River bed sediment and the
extraction of reactive 10Be/9Be ratios, Chem. Geol., 318–319, 126–138,
https://doi.org/10.1016/j.chemgeo.2012.04.031, 2012.
Wittmann, H., Blanckenburg, F., Dannhaus, N., Bouchez, J., Gaillardet, J.,
Guyot, J. L., Maurice, L., Roig, H., Filizola, N., and Christl, M.: A test of
the cosmogenic 10Be(meteoric)/9Be proxy for simultaneously determining
basin-wide erosion rates, denudation rates, and the degree of weathering in
the Amazon basin, J. Geophys. Res.-Earth Surf., 120, 2498–2528,
https://doi.org/10.1002/2015JF003581.Received, 2015.
Xuan, C., Channell, J. E. T., Polyak, L., and Darby, D. A.: Paleomagnetism of
Quaternary sediments from Lomonosov Ridge and Yermak Plateau: implications
for age models in the Arctic Ocean, Quat. Sci. Rev., 32, 48–63,
https://doi.org/10.1016/j.quascirev.2011.11.015, 2012.
Zawalna-Geer, A., Lindsay, J. M., Davies, S., Augustinus, P., and Davies, S.: Extracting a primary Holocene crytoptephra record from Pupuke maar sediments, Auckland, New Zealand, J. Quaternary Sci., 31, 442–457, https://doi.org/10.1002/jqs.2866, 2016.
Zhu, R. X., Zhou, L. P., Laj, C., Mazaud, A., and Ding, Z. L.: The Blake
geomagnetic polarity episode recorded in Chinese loess, Geophys. Res. Lett.,
21, 697–700, 1994.
Zolitschka, B., Anselmetti, F., Ariztegui, D., Corbella, H., Francus, P.,
Lücke, A., Maidana, N. I., Ohlendorf, C., Schäbitz, F., and
Wastegård, S.: Environment and climate of the last 51 000 years – new
insights from the Potrok Aike maar lake Sediment Archive Drilling prOject
(PASADO), Quat. Sci. Rev., 71, 1–12, https://doi.org/10.1016/j.quascirev.2012.11.024,
2013.
Short summary
Orakei Basin – a former maar lake in Auckland, New Zealand – provides an outstanding sediment record over the last ca. 130 000 years, but an age model is required to allow the reconstruction of climate change and volcanic eruptions contained in the sequence. To construct a relationship between depth in the sediment core and age of deposition, we combined tephrochronology, radiocarbon dating, luminescence dating, and the relative intensity of the paleomagnetic field in a Bayesian age–depth model.
Orakei Basin – a former maar lake in Auckland, New Zealand – provides an outstanding sediment...
