<sup>230</sup>Th ∕ U isochron dating of cryogenic cave carbonates
Abstract 230 Th/U disequilibrium methods, that provide evidence of palaeo-permafrost conditions. In the field, CCCs occur as distinct patches of millimetre- to centimetre-sized loose crystals and crystal aggregates on the floors of cave chambers, so they lack a framework that would allow ages to be validated by stratigraphic order. Correction factors for the initial 230 Th (230 Th0) are often based on the bulk-earth-derived initial 230 Th/232 Th activity ratio ((230 Th/232 Th) 0 230 Th0 is moderately low. For samples with elevated levels of 230 Th0, however, accuracy can be improved by constraining (230 Th/232 Th) 0 230 Th/U analyses. We find that individual CCC crystals show a range of morphologies that arise from non-crystallographic branching in response to the chemical evolution of the freezing solution. Results of 230 Th/U dating indicate that samples with a large surface area relative to the sample volume are systematically more affected by contamination with 230 Th0. By fitting isochrons to these results, we test whether the CCCs in a patch formed during the same freezing event, and demonstrate that (230 Th/232 Th) 0 230 Th0, isochrons are a useful tool to constrain (230 Th/232 Th) 0 230 Th0. Our results suggest that some previously published CCC ages may merit re-assessment, and we provide suggestions on how to approach future dating efforts.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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230Th ∕ U isochron dating of cryogenic cave carbonates ; volume:4 ; number:2 ; year:2022 ; pages:617-627 ; extent:11
Geochronology ; 4, Heft 2 (2022), 617-627 (gesamt 11)
- Creator
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Töchterle, Paul
Steidle, Simon D.
Edwards, R. Lawrence
Dublyansky, Yuri
Spötl, Christoph
Li, Xianglei
Gunn, John
Moseley, Gina
- DOI
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10.5194/gchron-4-617-2022
- URN
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urn:nbn:de:101:1-2022092205271612639513
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:34 AM CEST
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Associated
- Töchterle, Paul
- Steidle, Simon D.
- Edwards, R. Lawrence
- Dublyansky, Yuri
- Spötl, Christoph
- Li, Xianglei
- Gunn, John
- Moseley, Gina
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