Articles | Volume 6, issue 1
https://doi.org/10.5194/gchron-6-107-2024
© Author(s) 2024. 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-6-107-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Bayesian integration of astrochronology and radioisotope geochronology
Department of Life and Environmental Sciences, University of California, Merced, CA, USA
Department of Geosciences, Boise State University, Boise, ID, USA
Stephen R. Meyers
Department of Geosciences, University of Wisconsin, Madison, WI, USA
Bradley B. Sageman
Department of Earth and Planetary Sciences, Northwestern University, Evanston, IL, USA
Mark D. Schmitz
Department of Geosciences, Boise State University, Boise, ID, USA
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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, https://doi.org/10.5194/gchron-8-85-2026, 2026
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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.
Trystan M. Herriott, James L. Crowley, Marwan A. Wartes, David L. LePain, and Mark D. Schmitz
Geochronology, 7, 513–543, https://doi.org/10.5194/gchron-7-513-2025, https://doi.org/10.5194/gchron-7-513-2025, 2025
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Paired moderate- and high-precision U–Pb geochronology is used to explore sources of young bias in laser-ablation-based detrital zircon maximum depositional ages (MDAs). We redefine the reference value for MDA accuracy as the age of the youngest analyzed population and reframe MDA algorithm assessments around validity. This study highlights opportunities to refine MDA research and anticipates continued community efforts to further improve accuracy of laser ablation zircon geochronology.
Dawid Szymanowski, Jörn-Frederik Wotzlaw, Maria Ovtcharova, Blair Schoene, Urs Schaltegger, Mark D. Schmitz, Ryan B. Ickert, Cyril Chelle-Michou, Kevin R. Chamberlain, James L. Crowley, Joshua H. F. L. Davies, Michael P. Eddy, Sean P. Gaynor, Alexandra Käßner, Michael T. Mohr, André N. Paul, Jahandar Ramezani, Simon Tapster, Marion Tichomirowa, Albrecht von Quadt, and Corey J. Wall
Geochronology, 7, 409–425, https://doi.org/10.5194/gchron-7-409-2025, https://doi.org/10.5194/gchron-7-409-2025, 2025
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We present the first community-wide evaluation of the reproducibility of U–Pb zircon geochronology by isotope dilution thermal ionisation mass spectrometry (ID-TIMS). Eleven labs analysed aliquots of the same, homogenised, pre-spiked solution of natural zircon, which removed geological bias inherent to using heterogeneous natural zircon grain populations. We discuss remaining sources of inter-lab bias and propose areas of improvement to analytical procedures.
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Short summary
Developing models that relate stratigraphic position to time are important because they allow the rock record to be understood in terms of absolute time, allowing global comparisons. We developed a novel method for developing these models (called age–depth models) that uses two different types of chronologic information, dated rocks, and records of variations in the Earth's orbit (astrochronology). The resulting models are very precise, which can improve understanding of past climates.
Developing models that relate stratigraphic position to time are important because they allow...