https://gchron.copernicus.org/articles/ Combined list of the recent articles of the journal Geochronology and the recent discussion forum Geochronology Discussions en https://doi.org/10.5194/gchron-8-329-2026 Testing current estimates of the in situ cosmogenic 10Be production rate in the north-western British Isles, with implications for ice sheet behaviour during Termination 1 Gordon R. M. Bromley, Brenda L. Hall, Aaron E. Putnam, and Thomas V. Lowell Geochronology, 8, 329–349, https://doi.org/10.5194/gchron-8-329-2026, 2026 Cosmogenic surface-exposure dating relies on accurate constraint of nuclide production rates. To improve dating resolution, we compare 10Be concentrations in deglacial surfaces in Scotland to local 14C targets to test the performance of 8 production rates. Of these, the Rannoch Moor rate from central Scotland gives the best fit with the 14C; others under-predict exposure age by up to 7 %. Our 10Be record also shows retreat of the last ice sheet was disrupted by a brief pause ~16 200 years ago. Fri, 05 Jun 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-313-2026 Response of the Rb–Sr system in biotite during contact metamorphism in the aureole of the Makhavinekh Lake Pluton, Labrador Christopher R. M. McFarlane Geochronology, 8, 313–327, https://doi.org/10.5194/gchron-8-313-2026, 2026 The mineral biotite is a common rock-forming mineral and notable for its ability to incorporate Rb into its structure. Microanalytical tools such a laser ablation and tandem mass spectrometry, allows Rb-Sr biotite dating with context preserved. This study reveals Sr mobility that is controlled by location in a rock. Reconstructing the timing of geological events using biotite Rb-Sr geochronology is, therefore, contingent on grain-scale evaluation of biotite textures. Thu, 28 May 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-297-2026 Novel insights into the post-IR IRSL200 signal bleachability of single-grain K-feldspars in fluvial modern analogues from the Southern Central Andes, Chile Arindam Biswas, Svenja Riedesel, Louise Karman-Besson, Max Hellers, Anne Guyez, Stéphane Bonnet, and Tony Reimann Geochronology, 8, 297–312, https://doi.org/10.5194/gchron-8-297-2026, 2026 We evaluate luminescence signal resetting in single-grain K-feldspar from modern fluvial analogues in Chile. Our results show a uniform sample-average bleaching trend but strong grain-scale variability. Residual doses are independent of feldspar geochemistry and catchment lithology but scale with natural dose. Taken together, these findings refine palaeodose correction strategies and support defining sample‑specific bleaching thresholds for luminescence‑based sediment tracing. Wed, 27 May 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-279-2026 40Ar ∕ 39Ar constraints on the eruption history of the Christiana Volcano of the Christiana-Santorini-Kolumbo volcanic field, Greece Pieter Z. Vroon, Teun Beemster, Xiaolong Zhou, Paraskevi Nomikou, Martijn Klaver, Jan R. Wijbrans, and Klaudia F. Kuiper Geochronology, 8, 279–295, https://doi.org/10.5194/gchron-8-279-2026, 2026 The Christiana Islands represents the oldest subaerial volcanism in the Christiana-Santorini-Kolombo volcanic field, but the exact age of this volcano has been unknown. This study reports new 40Ar/39Ar ages of ten volcanic samples from Christiana Island that cluster between 2.5–2.7 Ma with small uncertainties (0.02–0.14 Ma). One sample dated much younger: 133 ka; this is most likely derived from the Middle Pumice Plinian eruption of Santorini. Wed, 27 May 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-255-2026 Paired 14C–10Be exposure ages from Mount Murphy, West Antarctica: Implications for accurate and precise deglacial chronologies Jonathan R. Adams, Dylan H. Rood, Klaus Wilcken, Stephen J. Roberts, and Joanne S. Johnson Geochronology, 8, 255–277, https://doi.org/10.5194/gchron-8-255-2026, 2026 Ice sheet mass loss is adding to sea-level rise, and is expected to increase, but by how much and how fast remains uncertain. Isotopes produced in rock at the Earth’s surface provide records of past ice sheet thinning which help predict future change but are more effective if they are precise enough to determine past changes to the nearest thousand years. Carbon-14 is a unique isotope that provides an accurate record of past change since the last ice age, however, its precision can be improved. Tue, 05 May 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-223-2026 Dating Late Pleistocene pluvial lake shorelines in the Great Basin, USA using rock surface luminescence dating techniques: developing new approaches for challenging lithologies Christina M. Neudorf, Teresa Wriston, Geraint T. H. Jenkins, and Sebastien Huot Geochronology, 8, 223–253, https://doi.org/10.5194/gchron-8-223-2026, 2026 This study examines the feasibility of dating beach ridges associated with pluvial lake highstands in the Great Basin, USA, using rock surface luminescence dating techniques. Limestone and volcanic rock lithologies prominent in this region pose challenges, but preliminary measurements show promise. We show that ages derived from beach ridge gravel rocks record the timing of lake highstands as well as climatically driven soil formation processes. Tue, 07 Apr 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-209-2026 Technical note: Geodynamic Thermochronology (GDTchron) – A Python package to calculate low-temperature thermochronometric ages from geodynamic numerical models Dylan A. Vasey, Peter M. Scully, John B. Naliboff, and Sascha Brune Geochronology, 8, 209–222, https://doi.org/10.5194/gchron-8-209-2026, 2026 We present an open-access Python package (GDTchron) designed to forward model apatite (U-Th)/He, apatite fission track, and zircon (U-Th)/He ages using temperatures output by geodynamic numerical models. The software can be used in a parallelized workflow to calculate large numbers of ages. We present two examples of potential applications of GDTchron: a simple model of exhumation and a complex model of continental rifting followed by mountain building. Wed, 01 Apr 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-191-2026 The conflict between sampling resolution and stratigraphic constraints from a Bayesian perspective: OSL and radiocarbon case studies Guillaume Guérin, Pierre Guitton-Boussion, Imène Bouafia, and Anne Philippe Geochronology, 8, 191–207, https://doi.org/10.5194/gchron-8-191-2026, 2026 Bayesian modelling is often used to refine numerically dated chronological sequences, e.g., by making use of stratigraphic constraints. First, a high-resolution dataset based on luminescence dating is modelled with the dedicated R package BayLum. Then, three Bayesian modelling tools – namely BayLum, Chronomodel and OxCal – are compared using a high-resolution, radiocarbon dataset. Modelling artefacts are identified; the strengths and weaknesses of the models are discussed. Mon, 30 Mar 2026 11:33:51 +0200 https://doi.org/10.5194/gchron-8-165-2026 Analytical and modelling strategies for thermal histories from in situ (U-Th-Sm) ∕ He data of single apatites Ann-Kathrin Maier, Christoph Glotzbach, and Sarah Falkowski Geochronology, 8, 165–189, https://doi.org/10.5194/gchron-8-165-2026, 2026 (U-Th-Sm)/He dating is a tool to investigate when and how rocks cooled through the upper Earth’s crust. We explore strategies to reconstruct thermal histories of individual apatite crystals by direct measurement of their helium concentration profile and radionuclide distribution. This approach allows for the inclusion of inhomogeneous grains in thermal modelling, which is often problematic in traditional (U-Th-Sm)/He methods. Fri, 27 Mar 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-143-2026 U-Pb dating of chrysocolla from supergene copper deposits in the Coastal Cordillera of northern Chile, Atacama Desert Juan Ríos-Contesse, Richard Albert, Benedikt Ritter-Prinz, Axel Gerdes, Tibor Dunai, and Eduardo Campos Geochronology, 8, 143–164, https://doi.org/10.5194/gchron-8-143-2026, 2026 This study dated chrysocolla, a supergene copper mineral, from copper deposits hosted in the Coastal Cordillera of northern Chile, with ages between 8.0 and 0.045 million years. Results show that from the Late Miocene to the Pleistocene, short periods of moisture triggered mineral formation despite the hyperarid climate. These wetter periods were likely caused by occasional rainfall or stronger coastal fog, causing repeated pulses of supergene activity in the Coastal Cordillera. Wed, 11 Mar 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-119-2026 In situ cosmogenic 10Be and 26Al reveal the complex exposure and erosion history of the landscape once covered by the Quebec-Labrador Ice Dome Peyton M. Cavnar, Paul R. Bierman, Jeremy D. Shakun, Lee B. Corbett, Danielle LeBlanc, Gillian L. Galford, Pierre-Olivier Couette, Jean-Francois Ghienne, Patrick Lajeunesse, Jérôme van der Woerd, and Marc Caffee Geochronology, 8, 119–141, https://doi.org/10.5194/gchron-8-119-2026, 2026 To investigate the Laurentide Ice Sheet’s erosivity before and during the Last Glacial Maximum, we sampled sand deposited by ice in eastern Canada before final deglaciation. We also sampled modern river sand. The 26Al and 10Be measured in glacial deposited sediments suggests that ice remained during some Pleistocene warm periods and was an inefficient eroder. Similar concentrations of 26Al and 10Be in modern sand suggests that most modern river sediment is sourced from glacial deposits.  Tue, 03 Mar 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-109-2026 FAIR fission track analysis with geochron@home Pieter Vermeesch, Tim Band, Jiangping He, Rex Galbraith, and Andrew Carter Geochronology, 8, 109–118, https://doi.org/10.5194/gchron-8-109-2026, 2026 geochron@home is a free and open-source platform that makes fission track dating more transparent and reliable. It combines a virtual microscope with an online database to share images and data openly, following FAIR principles. Researchers can analyse tracks privately, archive data for peer review, teach students, or involve citizen scientists. By improving data access and reproducibility, geochron@home helps build trust and supports future advances in Earth science. Wed, 25 Feb 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-85-2026 Global and regional Pleistocene benthic δ18O stacks with a comparison of different age modeling strategies Yuxin Zhou, Lorraine E. Lisiecki, Stephen R. Meyers, Taehee Lee, and Charles Lawrence Geochronology, 8, 85–107, https://doi.org/10.5194/gchron-8-85-2026, 2026 Marine sediments contain valuable information about past climate changes. However, dating Pleistocene marine sediments can be difficult, and the accuracy of the age model depends on the quality of the stratigraphic alignment target. We introduce three targets – Atlantic, Pacific, and global – with three distinct chronologies for the global target that incorporate astronomical forcing constraints to various degrees. This suite of targets offers flexibility in age model construction. Thu, 05 Feb 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-63-2026 Improving crystallization and eruption age estimation using U-Th disequilibrium dating of young volcanic zircon Zoe Moser, Marcel Guillong, Chetan Nathwani, Kurumi Iwahashi, Razvan-Gabriel Popa, and Olivier Bachmann Geochronology, 8, 63–84, https://doi.org/10.5194/gchron-8-63-2026, 2026 To improve U-Th zircon dating, we optimized a U-Th-Pb double-dating strategy for young zircon (150–300 ka). We found that the overall U-Th age spectrum is consistent whether assuming a constant melt composition or constant U/Th fractionation between zircon and melt, but testing the representability of the measured glass with the youngest isochron intercept proved essential. A Bayesian model with a uniform prior distribution gave the most accurate estimates of eruption timing for U-Th datasets. Mon, 26 Jan 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-37-2026 Exploring the relationships between Electron Spin Resonance (ESR)/Luminescence (OSL/TL) properties and trace element composition from quartz in various bedrocks (Strengbach catchment, Vosges) Hélène Tissoux, Magali Rizza, Claire Aupart, Gilles Rixhon, Pierre G. Valla, Manon Boulay, Philippe Lach, and Pierre Voinchet Geochronology, 8, 37–61, https://doi.org/10.5194/gchron-8-37-2026, 2026 In this study, Optically Stimulated Luminescence (OSL), Electron Spin Resonance (ESR) and Laser Ablation-Induced Coupled Plasma-Mass Spectroscopy (La-ICPMS) trace element (TE) analyses shows that TE composition may influence OSL and ESR-Ti sensitivities in quartz, which vary with bedrock type. Pressure may take a part in OSL/ESR-Ti sensitivities variability while ESR-Al intensities could be linked to initial fluid composition and crystallization conditions Mon, 19 Jan 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-19-2026 Cosmogenic 3He exposure dating in mafic rocks by “Virtual mineral separation” of pyroxene Marie Bergelin, Greg Balco, and Richard A. Ketcham Geochronology, 8, 19–35, https://doi.org/10.5194/gchron-8-19-2026, 2026 We developed a faster and simpler method to measure helium gas in targeted minerals within whole rocks to determine how long they have been exposed at Earth's surface. Instead of manually separating minerals, our method uses heat to release gas from the specific minerals of interest. This reduces time, cost, and physical effort, making it easier to collect large amounts of data when studying landscape change or when only small rock samples are available. Fri, 16 Jan 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-8-1-2026 Rapid dose rate estimation for trapped charge dating using pXRF measurements of potassium concentration Sam Woor, Mitch K. D'Arcy, Olav B. Lian, Maria Schaarschmidt, and Julie A. Durcan Geochronology, 8, 1–18, https://doi.org/10.5194/gchron-8-1-2026, 2026 We show that portable X-ray fluorescence can be used to rapidly (ca. 90 s) estimate the rate of background radioactivity in sediment used to calculate burial ages in trapped charge dating studies. This procedure involves inputting a measurement of potassium concentration into a set of simple regression equations, defined by a large radionuclide dataset. Results show good agreement with high-precision methods. Our rapid method will help to quickly generate burial age estimates. Wed, 07 Jan 2026 11:33:51 +0100 https://doi.org/10.5194/gchron-7-591-2025 Technical note: Investigation into the relationship between zircon structural damage and Pb mobility using chemical abrasion, SIMS, Raman spectroscopy, and atom probe tomography Charles W. Magee Jr., Lutz Nasdala, Renelle Dubosq, Baptiste Gault, and Simon Bodorkos Geochronology, 7, 591–602, https://doi.org/10.5194/gchron-7-591-2025, 2025 Chemical abrasion (CA) is a two-step method for reducing Pb loss where zircon is annealed then partially dissolved. We use secondary ion mass spectrometry (SIMS) to find closed- and open-system zircon domains in zircon that has been chemically abraded, annealed only, or untreated. Raman mapping identifies lattice damage in SIMS spots. Atom probe tomography (APT) results from both the discordant spots and the concordant ones are all homogeneous and identical. Thus, APT cannot distinguish discordant and concordant zircon. Thu, 04 Dec 2025 11:33:51 +0100 https://doi.org/10.5194/gchron-7-583-2025 Short communication: Estimating radiocarbon reservoir effects in Bolivian Amazon freshwater lakes Asier García-Escárzaga, Umberto Lombardo, Patricia M. Bello-Alonso, José M. Capriles, André Colonese, Kate Dudgeon, Carlos D. Simões, and Ricardo Fernandes Geochronology, 7, 583–589, https://doi.org/10.5194/gchron-7-583-2025, 2025 The Llanos de Moxos (Bolivian Amazon) host thousands of anthropogenic forest islands from the Holocene. These sites contain shell middens primarily composed of freshwater snails (Pomacea spp.), often used for ¹⁴C dating. To evaluate potential radiocarbon reservoir effects (RRE), modern Pomacea shells and coeval tree leaves were analysed. Results reveal no significant RRE, supporting their reliability for dating archaeological and paleoecological records in the region. Mon, 24 Nov 2025 11:33:51 +0100 https://doi.org/10.5194/gchron-7-571-2025 Technical note: Improved calculation of volume, FT correction, and other derived data for polished zircon (U-Th)/He thermochronology Barra A. Peak Geochronology, 7, 571–582, https://doi.org/10.5194/gchron-7-571-2025, 2025 Conventional (U-Th)/He thermochronology requires accurate calculation of mineral grain volume, often based on approximations to idealized geometries. However, there are many instances where knowingly altering the geometry by polishing grains for additional in situ data collection is desirable. This contribution provides a new method to calculate volume and other data for polished grains used in zircon (U-Th)/He thermochronology analysis using no-added-cost modifications of existing workflows. Mon, 03 Nov 2025 11:33:51 +0100