Articles | Volume 4, issue 2
https://doi.org/10.5194/gchron-4-617-2022
https://doi.org/10.5194/gchron-4-617-2022
Research article
 | 
15 Sep 2022
Research article |  | 15 Sep 2022

230Th ∕ U isochron dating of cryogenic cave carbonates

Paul Töchterle, Simon D. Steidle, R. Lawrence Edwards, Yuri Dublyansky, Christoph Spötl, Xianglei Li, John Gunn, and Gina E. Moseley

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Latest update: 26 May 2024
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Short summary
Cryogenic cave carbonates (CCCs) provide a marker for past permafrost conditions. Their formation age is determined by Th / U dating. However, samples can be contaminated with small amounts of Th at formation, which can cause inaccurate ages and require correction. We analysed multiple CCCs and found that varying degrees of contamination can cause an apparent spread of ages, when samples actually formed within distinguishable freezing events. A correction method using isochrons is presented.