Articles | Volume 6, issue 4
https://doi.org/10.5194/gchron-6-697-2024
https://doi.org/10.5194/gchron-6-697-2024
Research article
 | 
20 Dec 2024
Research article |  | 20 Dec 2024

Interpreting cooling dates and histories from laser ablation in situ (U–Th–Sm) ∕ He thermochronometry: a modelling perspective

Christoph Glotzbach and Todd A. Ehlers

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Short summary
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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