Articles | Volume 8, issue 3
https://doi.org/10.5194/gchron-8-567-2026
© Author(s) 2026. 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-8-567-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Sep 2026
Research article |
| 15 Sep 2026
| 15 Sep 2026
In situ apatite U-Pb, fission track and (U-Th) ∕ He triple dating using a simple embedding approach
Christoph Glotzbach
CORRESPONDING AUTHOR
Department of Geosciences, University of Tuebingen, Germany
Alexander Neely
Arizona Geological Survey, Tucson, Arizona, USA
Todd Alan Ehlers
School of Geographical and Earth Sciences, University of Glasgow, Scotland, UK
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(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.
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(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.
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The (U–Th–Sm) / He dating method helps understand the cooling history of rocks. Synthetic modelling 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.
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The thickness of palaeo-ice on the calving front around the LGM was estimated to be at least 305 to 320 m.
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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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Short summary
We present a simple, robust method for triple dating (U–Pb, fission track, and in-situ (U–Th)/He) of apatite using Teflon mounts. The approach increases analytical throughput and ensures data quality via a decision matrix. Validation with Durango apatite and application to the Odenwald demonstrates its reliability and the ability to resolve complex thermal histories.
We present a simple, robust method for triple dating (U–Pb, fission track, and in-situ...
