Articles | Volume 5, issue 1
https://doi.org/10.5194/gchron-5-181-2023
© Author(s) 2023. 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-5-181-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
20 Apr 2023
Research article |
| 20 Apr 2023
| 20 Apr 2023
DQPB: software for calculating disequilibrium U–Pb ages
Timothy Pollard
CORRESPONDING AUTHOR
School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
EDYTEM UMR CNRS 5204, Université Savoie Mont Blanc, Le Bourget du Lac, CEDEX 73376, France
Jon Woodhead
School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
John Hellstrom
School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
John Engel
School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
Roger Powell
School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
Russell Drysdale
School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Victoria 3010, Australia
EDYTEM UMR CNRS 5204, Université Savoie Mont Blanc, Le Bourget du Lac, CEDEX 73376, France
Related authors
No articles found.
Timothy J. Pollard, Jon D. Woodhead, Russell N. Drysdale, R. Lawrence Edwards, Xianglei Li, Ashlea N. Wainwright, Mathieu Pythoud, Hai Cheng, John C. Hellstrom, Ilaria Isola, Eleonora Regattieri, Giovanni Zanchetta, and Dylan S. Parmenter
Geochronology, 7, 335–355, https://doi.org/10.5194/gchron-7-335-2025, https://doi.org/10.5194/gchron-7-335-2025, 2025
Short summary
Short summary
The uranium–thorium (U–Th) and uranium–lead (U–Pb) radiometric dating methods are both suitable for dating carbonate samples ranging in age from about 400 000 to 650 000 years. Here we test agreement between the two methods by dating speleothems (i.e. secondary cave mineral deposits) that are well-suited to both methods. We demonstrate excellent agreement between them and discuss their relative strengths and weaknesses.
Georgina Falster, Gab Abramowitz, Sanaa Hobeichi, Cath Hughes, Pauline Treble, Nerilie J. Abram, Michael I. Bird, Alexandre Cauquoin, Bronwyn Dixon, Russell Drysdale, Chenhui Jin, Niels Munksgaard, Bernadette Proemse, Jonathan J. Tyler, Martin Werner, and Carol Tadros
EGUsphere, https://doi.org/10.5194/egusphere-2025-2458, https://doi.org/10.5194/egusphere-2025-2458, 2025
This preprint is open for discussion and under review for Hydrology and Earth System Sciences (HESS).
Short summary
Short summary
We used a random forest approach to produce estimates of monthly precipitation stable isotope variability from 1962–2023, at high resolution across the entire Australian continent. Comprehensive skill and sensitivity testing shows that our random forest models skilfully predict precipitation isotope values in places and times that observations are not available. We make all outputs publicly available, facilitating use in fields from ecology and hydrology to archaeology and forensic science.
Maddalena Passelergue, Isabelle Couchoud, Russell N. Drysdale, John Hellstrom, Dirk L. Hoffmann, and Alan Greig
EGUsphere, https://doi.org/10.5194/egusphere-2025-2945, https://doi.org/10.5194/egusphere-2025-2945, 2025
This preprint is open for discussion and under review for Climate of the Past (CP).
Short summary
Short summary
The Holocene is marked at 8.2 ka by a North Atlantic freshening event. We investigate its climatic impact in SW France using high-resolution speleothem multiproxy analysis. While the event is seen in some European records, no clear signal appears in ours. This may reflect either limited regional impact, and/or low speleothem sensitivity to the Atlantic event, possibly masked by Mediterranean influence.
Himadri Saini, David K. Hutchinson, Josephine R. Brown, Russell N. Drysdale, Yanxuan Du, and Laurie Menviel
EGUsphere, https://doi.org/10.5194/egusphere-2025-1990, https://doi.org/10.5194/egusphere-2025-1990, 2025
Short summary
Short summary
This study examines how large ice sheets during the last Ice Age influenced global weather patterns. We found that the presence of these ice sheets affected rainfall patterns in regions like Eurasia and Australia. By altering wind and weather systems, they shifted the position of the tropical rainbelt and impacted the circulation of air in both the Northern and Southern Hemispheres. Our research helps us understand past climate changes and their potential effects on future climate patterns.
Calla N. Gould-Whaley, Russell N. Drysdale, Pauline C. Treble, Jan-Hendrik May, Stacey C. Priestley, John C. Hellstrom, Christopher R. Vardanega, and Clare C. Buswell
Clim. Past, 21, 857–876, https://doi.org/10.5194/cp-21-857-2025, https://doi.org/10.5194/cp-21-857-2025, 2025
Short summary
Short summary
Climate change is causing enhanced aridity across many regions of the globe, leading to increased reliance on groundwater resources. We need to understand how groundwater recharge behaves in arid regions over long timescales; unfortunately, arid landscapes tend to preserve very little evidence of their climatic past. We present evidence to suggest that carbonate formations that grow in groundwater can be used as archives of past groundwater recharge in Australia's arid zone.
Hubert B. Vonhof, Sophie Verheyden, Dominique Bonjean, Stéphane Pirson, Michael Weber, Denis Scholz, John Hellstrom, Hai Cheng, Xue Jia, Kévin Di Modica, Gregory Abrams, Marjan A. P. van Nunen, Joost Ruiter, Michèlle van der Does, Daniel Böhl, and Jeroen H. J. L. van der Lubbe
Clim. Past, 20, 2741–2758, https://doi.org/10.5194/cp-20-2741-2024, https://doi.org/10.5194/cp-20-2741-2024, 2024
Short summary
Short summary
The sedimentary sequence in Scladina Cave (Belgium) is well-known for its rich archeological assemblages and its numerous faunal remains. Of particular interest is the presence of a nearly complete jaw bone of a Neanderthal child. In this study, we present new uranium series ages of stalagmites from the archeological sequence that allow more precise dating of the archeological finds. One key result is that the Neanderthal child may be slightly older than previously thought.
Frédéric Parrenin, Marie Bouchet, Christo Buizert, Emilie Capron, Ellen Corrick, Russell Drysdale, Kenji Kawamura, Amaëlle Landais, Robert Mulvaney, Ikumi Oyabu, and Sune Olander Rasmussen
Geosci. Model Dev., 17, 8735–8750, https://doi.org/10.5194/gmd-17-8735-2024, https://doi.org/10.5194/gmd-17-8735-2024, 2024
Short summary
Short summary
The Paleochrono-1.1 probabilistic dating model allows users to derive a common and optimized chronology for several paleoclimatic sites from various archives (ice cores, speleothems, marine cores, lake cores, etc.). It combines prior sedimentation scenarios with chronological information such as dated horizons, dated intervals, stratigraphic links and (for ice cores) Δdepth observations. Paleochrono-1.1 is available under an open-source license.
Candan U. Desem, Patrice de Caritat, Jon Woodhead, Roland Maas, and Graham Carr
Earth Syst. Sci. Data, 16, 1383–1393, https://doi.org/10.5194/essd-16-1383-2024, https://doi.org/10.5194/essd-16-1383-2024, 2024
Short summary
Short summary
Lead (Pb) isotopes form a potent tracer in studies of provenance, mineral exploration and environmental remediation. Previously, however, Pb isotope analysis has rarely been deployed at a continental scale. Here we present a new regolith Pb isotope dataset for Australia, which includes 1119 large catchments encompassing 5.6 × 106 km2 or close to ~75 % of the continent. Isoscape maps have been produced for use in diverse fields of study.
Miguel Bartolomé, Ana Moreno, Carlos Sancho, Isabel Cacho, Heather Stoll, Negar Haghipour, Ánchel Belmonte, Christoph Spötl, John Hellstrom, R. Lawrence Edwards, and Hai Cheng
Clim. Past, 20, 467–494, https://doi.org/10.5194/cp-20-467-2024, https://doi.org/10.5194/cp-20-467-2024, 2024
Short summary
Short summary
Reconstructing past temperatures at regional scales during the Common Era is necessary to place the current warming in the context of natural climate variability. We present a climate reconstruction based on eight stalagmites from four caves in the Pyrenees, NE Spain. These stalagmites were dated precisely and analysed for their oxygen isotopes, which appear dominated by temperature changes. Solar variability and major volcanic eruptions are the two main drivers of observed climate variability.
Hege Kilhavn, Isabelle Couchoud, Russell N. Drysdale, Carlos Rossi, John Hellstrom, Fabien Arnaud, and Henri Wong
Clim. Past, 18, 2321–2344, https://doi.org/10.5194/cp-18-2321-2022, https://doi.org/10.5194/cp-18-2321-2022, 2022
Short summary
Short summary
The analysis of stable carbon and oxygen isotopic ratios, trace element ratios, and growth rate from a Spanish speleothem provides quantitative information on past hydrological conditions during the early Holocene in south-western Europe. Our data show that the cave site experienced increased effective recharge during the 8.2 ka event. Additionally, the oxygen isotopes indicate a change in the isotopic composition of the moisture source, associated with the meltwater flux to the North Atlantic.
Zuorui Liu, Amy Prendergast, Russell Drysdale, and Jan-Hendrik May
E&G Quaternary Sci. J., 71, 227–241, https://doi.org/10.5194/egqsj-71-227-2022, https://doi.org/10.5194/egqsj-71-227-2022, 2022
Short summary
Short summary
Past studies used two sampling strategies, the "bulk" and "sequential" drilling methods, for stable isotopic analysis of mammoth tooth enamel and paleoenvironmental reconstruction. This study applied both methods to the same enamel ridges of multiple mammoth teeth and compared their respective δ18O values. Offsets were detected between the bulk and average sequential δ18O values. The potential reasons for the offsets and their impacts on cross-method data comparison were discussed.
Cinthya Esther Nava Fernandez, Tobias Braun, Bethany Fox, Adam Hartland, Ola Kwiecien, Chelsea Pederson, Sebastian Hoepker, Stefano Bernasconi, Madalina Jaggi, John Hellstrom, Fernando Gázquez, Amanda French, Norbert Marwan, Adrian Immenhauser, and Sebastian Franz Martin Breitenbach
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-172, https://doi.org/10.5194/cp-2021-172, 2022
Manuscript not accepted for further review
Short summary
Short summary
We provide a ca. 1000 year long (6.4–5.4 ka BP) stalagmite-based reconstruction of mid-Holocene rainfall variability in the tropical western Pacific. The annually laminated multi-proxy (δ13C, δ18O, X/Ca, gray values) record comes from Niue island and informs on El Nino-Southern Oscillation and South Pacific Convergence Zone dynamics. Our data suggest that ENSO was active and influenced rainfall seasonality over the covered time interval. Rainfall seasonality was subdued during active ENSO phases
Inken Heidke, Adam Hartland, Denis Scholz, Andrew Pearson, John Hellstrom, Sebastian F. M. Breitenbach, and Thorsten Hoffmann
Biogeosciences, 18, 2289–2300, https://doi.org/10.5194/bg-18-2289-2021, https://doi.org/10.5194/bg-18-2289-2021, 2021
Short summary
Short summary
We analyzed lignin oxidation products (LOPs) in leaf litter and different soil horizons as well as dripwater and flowstone samples from four different cave sites from different vegetation zones in New Zealand using liquid chromatography coupled to mass spectrometry. We test whether the original source-dependent LOP signal of the overlying vegetation is preserved and can be recovered from flowstone samples and investigate how the signal is altered by the transport from the soil to the cave.
Matej Lipar, Andrea Martín-Pérez, Jure Tičar, Miha Pavšek, Matej Gabrovec, Mauro Hrvatin, Blaž Komac, Matija Zorn, Nadja Zupan Hajna, Jian-Xin Zhao, Russell N. Drysdale, and Mateja Ferk
The Cryosphere, 15, 17–30, https://doi.org/10.5194/tc-15-17-2021, https://doi.org/10.5194/tc-15-17-2021, 2021
Short summary
Short summary
The U–Th ages of subglacial carbonate deposits from a recently exposed surface previously occupied by the disappearing glacier in the SE European Alps suggest the glacier’s presence throughout the entire Holocene. These thin deposits, formed by regelation, would have been easily eroded if exposed during previous Holocene climatic optima. The age data indicate the glacier’s present unprecedented level of retreat and the potential of subglacial carbonates to act as palaeoclimate proxies.
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
Short summary
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.
Cited articles
Albarède, F. (Ed.):
Introduction to Geochemical Modelling, Cambridge University Press, Cambridge, https://doi.org/10.1017/CBO9780511622960, 1995. a, b
Bajo, P., Drysdale, R., Woodhead, J., Hellstrom, J., and Zanchetta, G.:
High-resolution U-Pb dating of an early Pleistocene stalagmite from Corchia Cave (Central Italy), Quat. Geochronol., 14, 5–17, https://doi.org/10.1016/j.quageo.2012.10.005, 2012. a
Barlow, R. J.:
A Guide to the Use of Statistical Methods in the Physical Sciences, in: The Manchester physics
series, edited by: Sandiford, D. J., Mandl, F., and Phillips, A. C., John Wiley and Sons, Chichester, England, ISBN 0471922943, 1989. a
Catchen, G.:
Application of the equations of radioactive growth and decay to geochronological models and explicit solution of the equations by Laplace transformation, Isot. Geosci., 2, 181–195, 1984. a
Chew, D. M., Sylvester, P. J., and Tubrett, M. N.:
U–Pb and Th–Pb Dating of apatite by LA-ICPMS, Chem. Geol., 280, 200–216, https://doi.org/10.1016/j.chemgeo.2010.11.010, 2011. a, b
Crowley, J. L., Schoene, B., Bowring, S. A.:
U-Pb dating of zircon in the Bishop Tuff at the millennial scale, Geology, 35, 1123–1126, https://doi.org/10.1130/G24017A.1, 2007. a, b
Drysdale, R. N., Paul, B. T., Hellstrom, J. C., Couchoud, I., Greig, A., Bajo, P., Zanchetta, G., Isola, I., Spötl, C., Baneschi, I., Regattieri, E., and Woodhead, J. D.:
Precise microsampling of poorly laminated speleothems for U-series dating, Quat. Geochronol., 14, 38–47, https://doi.org/10.1016/j.quageo.2012.06.009, 2012. a
Engel, J. and Pickering, R.:
The role of inherited Pb in controlling the quality of speleothem U-Pb ages, Quat. Geochronol., 67, 101243, https://doi.org/10.1016/j.quageo.2021.101243, 2022. a
Engel, J., Woodhead, J., Hellstrom, J., Maas, R., Drysdale, R., and Ford, D.:
Corrections for initial isotopic disequilibrium in the speleothem U-Pb dating method, Quat. Geochronol., 54, 101009, https://doi.org/10.1016/j.quageo.2019.101009, 2019. a, b, c
Engel, J., Maas, R., Woodhead, J., Tympel, J., and Greig, A.:
A single-Column extraction chemistry for isotope dilution U-Pb dating of carbonate, Chem. Geol., 531, 119311, https://doi.org/10.1016/j.chemgeo.2019.119311, 2020. a
Fuller, W. R.:
Measurement error models, John Wiley and Sons, 440 pp., https://doi.org/10.1002/9780470316665, 1987. a
Getty, S. R. and DePaolo, D. J.:
Quaternary geochronology using the U-Th-Pb method, Geochim. Cosmochim. Ac., 59, 3267–3272, https://doi.org/10.1016/0016-7037(95)00197-8, 1995. a, b
Getty, S. R., Asmerom, Y., Quinn, T. M., and Budd, A. F.:
Accelerated Pleistocene coral extinctions in the Caribbean Basin shown by uranium-lead (U-Pb) dating, Geology, 29, 639–642, https://doi.org/10.1130/0091-7613(2001)029<0639:APCEIT>2.0.CO;2, 2001. a
Guillong, M., von Quadt, A., Sakata, S., Peytcheva, I., and Bachmann, O.:
LA-ICP-MS Pb-U Dating of young zircons from the Kos–Nisyros volcanic centre, SE Aegean Arc, J. Anal. Atom. Spectrom., 29, 963–970, https://doi.org/10.1039/C4JA00009A, 2014. a, b
Harris, C. R., Millman, K. J., van der Walt, S. J., Gommers, R., Virtanen, P., Cournapeau, D.,
Wieser, E., Taylor, J., Berg, S., Smith, N. J., Kern, R., Picus, M., Hoyer, S., van Kerkwijk, M. H.,
Brett, M., Haldane, A., del Río, J. F., Wiebe, M., Peterson, P., Gérard-Marchant, P., Sheppard,
K., Reddy, T., Weckesser, W., Abbasi, H., Gohlke, C., and Oliphant, T. E.: Array programming with NumPy, Nature, 585, 357–362, 2020. a
Hattori, K., Sakata, S., Tanaka, M., Orihashi, Y., and Hirata, T.:
U-Pb age determination for zircons using laser ablation-ICP-mass spectrometry equipped with six multiple-ion counting detectors, J. Anal. Atom. Spectrom., 32, 88–95, https://doi.org/10.1039/C6JA00311G, 2017. a
Hayes, K.:
Finite-sample bias-correction factors for the median absolute deviation, Commun. Stat. Simulat., 43, 2205–2212, https://doi.org/10.1080/03610918.2012.748913, 2014. a
Hellstrom, J. C.:
Rapid and accurate
Hunter, J. D.:
Matplotlib: A 2D-graphics environment, Comput. Sci. Eng., 9, 90–95, https://doi.org/10.1109/MCSE.2007.55, 2007. a
Ickert, R. B., Mundil, R., Magee, C. W., and Mulcahy, S. R.:
The U–Th–Pb systematics of zircon from the Bishop Tuff: A case study in challenges to high-precision
Ivanovich, M. and Harmon, R. S.:
Uranium-Series Disequilibrium: Applications to Earth, Marine, and Environmental Sciences, 2nd Edn., Clarendon Press, United Kingdom, ISBN 019854278X, 1992. a
Joint Committee for Guides in Metrology (JCGM):
Evaluation of measurement data–Supplement 1 to the 'Guide to the expression of uncertainty in measurement' Propagation of Distributions Using a Monte Carlo Method, International Bureau of Weights and Measures (BIPM), Sèvres, France, 2008. a
Ludwig, K. R.: Calculation of uncertainties of U-Pb isotope data, Earth Planet. Sc.
Lett., 46, 212–220, 1980. a
Ludwig, K. R.:
On the treatment of concordant uranium-lead ages, Geochim. Cosmochim. Ac., 62, 665–676, https://doi.org/10.1016/S0016-7037(98)00059-3, 1998. a, b
Ludwig, K. R.: Mathematical–statistical treatment of data and errors for
Maronna, R. A., Martin, D., Yohai, V. J., and Salibián-Barrera, M.: Robust statistics: Theory and
Methods (with R), 2nd Edn., Hoboken, New Jersey, USA, ISBN 9781119214687, 2019. a
Mattinson, J. M.:
Anomalous isotopic composition of lead in young zircons, in: Carnegie Institution Washington Yearbook 72, Carnegie Institution of Washington, 613–616, 1973. a
Neymark, L. A., Amelin, Y. V., and Paces, J. B.:
206Pb-230Th-234U-238U and 207Pb-235U geochronology of Quaternary opal, Yucca Mountain, Nevada, Geochim. Cosmochim. Ac., 64, 2913–2928, https://doi.org/10.1016/S0016-7037(00)00408-7, 2000. a
Oliphant, T. E.:
Python for scientific computing, Comput. Sci. Eng., 9, 10–20, https://doi.org/10.1109/MCSE.2007.58, 2007. a
Osmond, J. K. and Cowart, J. B.:
Groundwater, in: Uranium-Series Disequilibrium and Applications to Environmental Problems, 2nd Edn., edited by: Ivanovich, M. and Harmon, R. S., Oxford Science Publications, Oxford, ISBN 019854278X, 1992. a
Paquette, J. L., Médard, E., Francomme, J., Bachèlery, P., and Hénot, J.-M.:
LA-ICP-MS
Parrish, R. R.:
U-Pb dating of monazite and its application to geological problems, Can. J. Earth Sci., 27, 1431–1450, 1990. a
Pickering, R., Dirks, P. H. G. M., Jinnah, Z., de Ruiter, D. J., Churchill, S. E., Herries, A. I. R., Woodhead, J. D., Hellstrom, J. C., and Berger, L. R.:
Australopithecus sediba at 1.977 Ma and implications for the origins of the genus Homo, Science, 333, 1421–1423, https://doi.org/10.1126/science.1203697, 2011. a
Pollard, T. J.: DQPB, Zenodo [code], https://doi.org/10.5281/zenodo.7804190, 2023a. a
Pollard, T. J.: pysoplot, Zenodo [code], https://doi.org/10.5281/zenodo.7804162, 2023b. a
Powell, R. and Holland, T.:
An internally consistent dataset with uncertainties and correlations: 3. Applications to geobarometry, worked examples and a computer program, J. Metamorph. Geol., 6, 173–204, https://doi.org/10.1111/j.1525-1314.1988.tb00415.x, 1988. a, b
Rasbury, E. T. and Cole, J. M.:
Directly dating geologic events: U-Pb dating of carbonates, Rev. Geophys., 47, 261–27, https://doi.org/10.1029/2007RG000246, 2009. a
Renne, P. R., Mundil, R., Balco, G., Min, K., Ludwig, K. R.:
Joint determination of 40K decay constants and
Richards, D. A., Bottrell, S. H., Cliff, R. A., Ströhle, K., and Rowe, P. J.:
U-Pb Dating of a speleothem of Quaternary age, Geochim. Cosmochim. Ac., 62, 3683–3688, https://doi.org/10.1016/S0016-7037(98)00256-7, 1998. a, b
Rioux, M., Johan Lissenberg, C., McLean, N. M., Bowring, S. A., MacLeod, C. J., Hellebrand, E., and Shimizu, N.:
Protracted Timescales of lower crustal growth at the fast-spreading East Pacific Rise, Nat. Geosci., 5, 275–278, https://doi.org/10.1038/ngeo1378, 2012. a
Rock, N. and Duffy, T.:
REGRES: A FORTRAN-77 program to calculate nonparametric and “structural” parametric solutions to bivariate regression equations, Comput. Geosci., 12, 807–818, https://doi.org/10.1016/0098-3004(86)90031-2, 1986.
Rock, N., Webb, J., McNaughton, N., and Bell, G.:
Nonparametric estimation of averages and errors for small data-sets in isotope geoscience: A proposal, Chemical Geology: Isotope Geoscience Section, 66, 163–177, https://doi.org/10.1016/0168-9622(87)90038-8, 1987. a, b
Sakata, S.:
A practical method for calculating the U-Pb age of Quaternary zircon: Correction for common Pb and initial disequilibria, Geochem. J., 52, 281–286, https://doi.org/10.2343/geochemj.2.0508, 2018. a, b
Sakata, S., Hattori, K., and and, H. I. G.:
Determination of U–Pb ages for young zircons using laser ablation-ICP-mass spectrometry coupled with an ion detection attenuator device, Wiley Online Library, https://doi.org/10.1111/j.1751-908X.2014.00320.x, 2014. a
Sakata, S., Hirakawa, S., Iwano, H., Danhara, T., Guillong, M., and Hirata, T.:
A new approach for constraining the magnitude of initial disequilibrium in Quaternary zircons by coupled uranium and thorium decay series dating, Quat. Geochronol., 38, 1–12, https://doi.org/10.1016/j.quageo.2016.11.002, 2017. a
Schoene, B.:
U–Th–Pb Geochronology, in: Treatise on Geochemistry, Vol. 4, edited by: Rudnick, R. L., 2nd Edn., Elsevier, 341–378, https://doi.org/10.1016/B978-0-08-095975-7.00310-7, 2014. a
Schmitt, A. K.:
Ion microprobe analysis of
Schmitz, M. D. and Schoene, B.:
Derivation of isotope ratios, errors, and error correlations for U-Pb geochronology using 205Pb-235U-(233U)-spiked isotope dilution thermal ionization mass spectrometric data, Geochem. Geophy. Geosy., 8, 1–20, https://doi.org/10.1029/2006GC001492, 2007.
Siegel, A. F.: Robust regression Using repeated medians, Biometrika, 69, 242–244, 1982. a
Stacey, J. S. and Kramers, J. D.:
Approximation of terrestrial lead isotope evolution by a two-stage model, Earth Planet. Sc. Lett., 26, 207–221, https://doi.org/10.1016/0012-821X(75)90088-6, 1975. a, b
Tera, F. and Wasserburg, G. J.:
U-Th-Pb Systematics in lunar highland samples from the Luna 20 and Apollo 16 missions, Earth Planet. Sc. Lett., 17, 36–51, https://doi.org/10.1016/0012-821X(72)90257-9, 1972. a, b
Titterington, D. M. and Halliday, A. N.:
On the fitting of parallel isochrons and the method of maximum likelihood, Chem. Geol., 26, 183–195, 1979. a
Vermeesch, P.:
IsoplotR: A free and open toolbox for Geochronology, Geosci. Front., 9, 1479–1493, https://doi.org/10.1016/j.gsf.2018.04.001, 2018. a
Virtanen, P., Gommers, R., Oliphant, T. E., Haberland, M., Reddy, T., Cournapeau, D., Burovski, E., Peterson, P., Weckesser, W., Bright, J., van der Walt, S. J., Brett, M., Wilson, J., Millman, K. J., Mayorov, N., Nelson, A. R. J., Jones, E., Kern, R., Larson, E., Carey, C. J., Polat, I., Feng, Y., Moore, E. W., VanderPlas, J., Laxalde, D., Perktold, J., Cimrman, R., Henriksen, I., Quintero, E. A., Harris, C. R., Archibald, A. M., Ribeiro, A. H., Pedregosa, F., van Mulbregt, P., and SciPy 1.0 Contributors: SciPy 1.0: Fundamental algorithms for scientific computing in Python, Nat. Methods, 17, 261–272, https://doi.org/10.1038/s41592-019-0686-2, 2020.
a
von Quadt, A., Gallhofer, D., Guillong, M., Peytcheva, I., Waelle, M., and Sakata, S.:
U–Pb dating of CA/non-CA treated zircons obtained by LA-ICP-MS and CA-TIMS techniques: Impact for their geological interpretation, J. Anal. Atom. Spectrom., 29, 1618–1629, https://doi.org/10.1039/C4JA00102H, 2014. a
Wendt, I. and Carl, C.:
The statistical distribution of the mean squared weighted deviation, Chemical Geology: Isotope Geoscience section, 86, 275–285, https://doi.org/10.1016/0168-9622(91)90010-T, 1991.
Williams, I. S.:
U-Th-Pb geochronology by ion microprobe, in: Applications of Microanalytical Techniques to Understanding Mineralizing Processes, edited by: McKibben, M. A., Shanks III, W. C., and Ridley, W. I., Review of Econonomic Geolology, 7, 1–35, 1998. a
Woodhead, J. and Pickering, R.:
Beyond 500ka: Progress and Prospects in the U-Pb chronology of speleothems, and their application to studies in palaeoclimate, human evolution, biodiversity and tectonics, Chem. Geol., 322–323, 290–299, https://doi.org/10.1016/j.chemgeo.2012.06.017, 2012. a
Woodhead, J., Hellstrom, J., Maas, R., Drysdale, R., Zanchetta, G., Devine, P., and Taylor, E.:
U–Pb Geochronology of speleothems by MC-ICPMS, Quat. Geochronol., 1, 208–221, https://doi.org/10.1016/j.quageo.2006.08.002, 2006. a, b, c
Woodhead, J., Hellstrom, J., Pickering, R., Drysdale, R., Paul, B., Bajo, P.:
U and Pb variability in older speleothems and strategies for their chronology, Quat. Geochronol., 14, 105–113, https://doi.org/10.1016/j.quageo.2012.02.028, 2012. a, b, c
York, D.:
Least-squares fitting of a straight line with correlated errors, Earth Planet. Sc. Lett., 5, 320–324, 1969. a
York, D., Evensen, N. M., Martínez, M. L., and De Basabe Delgado, J.:
Unified equations for the slope, intercept, and standard errors of the best straight line, Am. J. Phys., 72, 367–375, https://doi.org/10.1119/1.1632486, 2004. a
Short summary
When using the uranium–lead (U–Pb) radiometric dating method on very young materials (e.g. Quaternary age zircon and carbonate minerals), it is important to accurately account for the production and decay of intermediate
daughterisotopes in the uranium-series decay chain. DQPB is open-source software that allows users to easily perform such calculations for a variety of sample types and produce publication-ready graphical outputs of the resulting age information.
When using the uranium–lead (U–Pb) radiometric dating method on very young materials (e.g....
