230 Th ∕ U isochron dating of cryogenic cave carbonates
Cryogenic cave carbonates (CCCs) are a type of speleothem, typically dated with <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><mi/&...
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2022
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ftdoajarticles:oai:doaj.org/article:92af2640c5a44eb8985ffcd1e2b586ba 2023-05-15T17:58:10+02:00 230 Th ∕ U isochron dating of cryogenic cave carbonates P. Töchterle S. D. Steidle R. L. Edwards Y. Dublyansky C. Spötl X. Li J. Gunn G. E. Moseley 2022-09-01T00:00:00Z https://doi.org/10.5194/gchron-4-617-2022 https://doaj.org/article/92af2640c5a44eb8985ffcd1e2b586ba EN eng Copernicus Publications https://gchron.copernicus.org/articles/4/617/2022/gchron-4-617-2022.pdf https://doaj.org/toc/2628-3719 doi:10.5194/gchron-4-617-2022 2628-3719 https://doaj.org/article/92af2640c5a44eb8985ffcd1e2b586ba Geochronology, Vol 4, Pp 617-627 (2022) Geology QE1-996.5 Stratigraphy QE640-699 article 2022 ftdoajarticles https://doi.org/10.5194/gchron-4-617-2022 2022-12-30T21:59:16Z Cryogenic cave carbonates (CCCs) are a type of speleothem, typically dated with <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><mi/><mn mathvariant="normal">230</mn></msup><mi mathvariant="normal">Th</mi><mo>/</mo><mi mathvariant="normal">U</mi></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="43pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="9d0a396b451698ee2c327cdb6628050e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-4-617-2022-ie00004.svg" width="43pt" height="15pt" src="gchron-4-617-2022-ie00004.png"/></svg:svg> 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 Th 0 ) are often based on the bulk-earth-derived initial <math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><mi/><mn mathvariant="normal">230</mn></msup><mi mathvariant="normal">Th</mi><msup><mo>/</mo><mn mathvariant="normal">232</mn></msup><mi mathvariant="normal">Th</mi></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="61pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="9cdbb0c7f20e3abf3a8f3624d7bcd32e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-4-617-2022-ie00005.svg" width="61pt" height="15pt" src="gchron-4-617-2022-ie00005.png"/></svg:svg> activity ratio ( <math xmlns="http://www.w3.org/1998/Math/MathML" ... Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Geochronology 4 2 617 627 |
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Geology QE1-996.5 Stratigraphy QE640-699 P. Töchterle S. D. Steidle R. L. Edwards Y. Dublyansky C. Spötl X. Li J. Gunn G. E. Moseley 230 Th ∕ U isochron dating of cryogenic cave carbonates |
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Geology QE1-996.5 Stratigraphy QE640-699 |
description |
Cryogenic cave carbonates (CCCs) are a type of speleothem, typically dated with <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><mi/><mn mathvariant="normal">230</mn></msup><mi mathvariant="normal">Th</mi><mo>/</mo><mi mathvariant="normal">U</mi></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="43pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="9d0a396b451698ee2c327cdb6628050e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-4-617-2022-ie00004.svg" width="43pt" height="15pt" src="gchron-4-617-2022-ie00004.png"/></svg:svg> 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 Th 0 ) are often based on the bulk-earth-derived initial <math xmlns="http://www.w3.org/1998/Math/MathML" id="M9" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><mi/><mn mathvariant="normal">230</mn></msup><mi mathvariant="normal">Th</mi><msup><mo>/</mo><mn mathvariant="normal">232</mn></msup><mi mathvariant="normal">Th</mi></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="61pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="9cdbb0c7f20e3abf3a8f3624d7bcd32e"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="gchron-4-617-2022-ie00005.svg" width="61pt" height="15pt" src="gchron-4-617-2022-ie00005.png"/></svg:svg> activity ratio ( <math xmlns="http://www.w3.org/1998/Math/MathML" ... |
format |
Article in Journal/Newspaper |
author |
P. Töchterle S. D. Steidle R. L. Edwards Y. Dublyansky C. Spötl X. Li J. Gunn G. E. Moseley |
author_facet |
P. Töchterle S. D. Steidle R. L. Edwards Y. Dublyansky C. Spötl X. Li J. Gunn G. E. Moseley |
author_sort |
P. Töchterle |
title |
230 Th ∕ U isochron dating of cryogenic cave carbonates |
title_short |
230 Th ∕ U isochron dating of cryogenic cave carbonates |
title_full |
230 Th ∕ U isochron dating of cryogenic cave carbonates |
title_fullStr |
230 Th ∕ U isochron dating of cryogenic cave carbonates |
title_full_unstemmed |
230 Th ∕ U isochron dating of cryogenic cave carbonates |
title_sort |
230 th ∕ u isochron dating of cryogenic cave carbonates |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/gchron-4-617-2022 https://doaj.org/article/92af2640c5a44eb8985ffcd1e2b586ba |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Geochronology, Vol 4, Pp 617-627 (2022) |
op_relation |
https://gchron.copernicus.org/articles/4/617/2022/gchron-4-617-2022.pdf https://doaj.org/toc/2628-3719 doi:10.5194/gchron-4-617-2022 2628-3719 https://doaj.org/article/92af2640c5a44eb8985ffcd1e2b586ba |
op_doi |
https://doi.org/10.5194/gchron-4-617-2022 |
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Geochronology |
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627 |
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