Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica
The Early Jurassic Butcher Ridge Igneous Complex (BRIC) in the Transantarctic Mountains contains abundant and variably hydrated silicic glass which has the potential to preserve a rich paleoclimate record. Here we present Fourier Transform Infrared Spectroscopic data that indicates BRIC glasses cont...
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ftpubmed:oai:pubmedcentral.nih.gov:9452555 2023-05-15T13:54:00+02:00 Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica Nelson, Demian A. Cottle, John M. Bindeman, Ilya N. Camacho, Alfredo 2022-09-07 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9452555/ https://doi.org/10.1038/s41467-022-32736-9 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9452555/ http://dx.doi.org/10.1038/s41467-022-32736-9 © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Nat Commun Article Text 2022 ftpubmed https://doi.org/10.1038/s41467-022-32736-9 2022-09-11T01:01:16Z The Early Jurassic Butcher Ridge Igneous Complex (BRIC) in the Transantarctic Mountains contains abundant and variably hydrated silicic glass which has the potential to preserve a rich paleoclimate record. Here we present Fourier Transform Infrared Spectroscopic data that indicates BRIC glasses contain up to ~8 wt.% molecular water (H(2)O(m)), and low (<0.8 wt.%) hydroxyl (OH) component, interpreted as evidence for secondary hydration by meteoric water. BRIC glasses contain the most depleted hydrogen isotopes yet measured in terrestrial rocks, down to δD = −325 ‰. In situ (40)Ar/(39)Ar geochronology of hydrated glasses with ultra-depleted δD values yield ages from 105 Ma to 72 Ma with a peak at c. 91.4 Ma. Combined, these data suggest hydration of BRIC glasses by polar glacial ice and melt water during the Late Cretaceous, contradicting paleoclimate reconstructions of this period that suggest Antarctica was ice-free and part of a global hot greenhouse. Text Antarc* Antarctica PubMed Central (PMC) Butcher Ridge ENVELOPE(155.800,155.800,-79.200,-79.200) Transantarctic Mountains Nature Communications 13 1 |
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Article Nelson, Demian A. Cottle, John M. Bindeman, Ilya N. Camacho, Alfredo Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
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Article |
description |
The Early Jurassic Butcher Ridge Igneous Complex (BRIC) in the Transantarctic Mountains contains abundant and variably hydrated silicic glass which has the potential to preserve a rich paleoclimate record. Here we present Fourier Transform Infrared Spectroscopic data that indicates BRIC glasses contain up to ~8 wt.% molecular water (H(2)O(m)), and low (<0.8 wt.%) hydroxyl (OH) component, interpreted as evidence for secondary hydration by meteoric water. BRIC glasses contain the most depleted hydrogen isotopes yet measured in terrestrial rocks, down to δD = −325 ‰. In situ (40)Ar/(39)Ar geochronology of hydrated glasses with ultra-depleted δD values yield ages from 105 Ma to 72 Ma with a peak at c. 91.4 Ma. Combined, these data suggest hydration of BRIC glasses by polar glacial ice and melt water during the Late Cretaceous, contradicting paleoclimate reconstructions of this period that suggest Antarctica was ice-free and part of a global hot greenhouse. |
format |
Text |
author |
Nelson, Demian A. Cottle, John M. Bindeman, Ilya N. Camacho, Alfredo |
author_facet |
Nelson, Demian A. Cottle, John M. Bindeman, Ilya N. Camacho, Alfredo |
author_sort |
Nelson, Demian A. |
title |
Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
title_short |
Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
title_full |
Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
title_fullStr |
Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
title_full_unstemmed |
Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
title_sort |
ultra-depleted hydrogen isotopes in hydrated glass record late cretaceous glaciation in antarctica |
publisher |
Nature Publishing Group UK |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9452555/ https://doi.org/10.1038/s41467-022-32736-9 |
long_lat |
ENVELOPE(155.800,155.800,-79.200,-79.200) |
geographic |
Butcher Ridge Transantarctic Mountains |
geographic_facet |
Butcher Ridge Transantarctic Mountains |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Nat Commun |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9452555/ http://dx.doi.org/10.1038/s41467-022-32736-9 |
op_rights |
© The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
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CC-BY |
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https://doi.org/10.1038/s41467-022-32736-9 |
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Nature Communications |
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13 |
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