Articles | Volume 4, issue 2
Geochronology, 4, 617–627, 2022
Geochronology, 4, 617–627, 2022
Research article
15 Sep 2022
Research article | 15 Sep 2022

230Th ∕ U isochron dating of cryogenic cave carbonates

Paul Töchterle et al.

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Cited articles

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Carolin, S. A., Cobb, K. M., Lynch-Stieglitz, J., Moerman, J. W., Partin, J. W., Lejau, S., Malang, J., Clark, B., Tuen, A. A., and Adkins, J. F.: Northern Borneo stalagmite records reveal West Pacific hydroclimate across MIS 5 and 6, Earth Planet. Sc. Lett., 439, 182–193,, 2016. 
Chaykovskiy, I. I. and Kadebskaya, O.: Morphology of cryogenic calcite from Rossiyskaya cave (Central Ural): Problems of mineralogy, petrography and metallogeny, Scientific readings in memory of P.N. Chirvinsky, 18, 102–112, 2015 (in Russian). 
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.