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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ftcdlib:oai:escholarship.org:ark:/13030/qt01g8c0x2 2023-11-12T04:06:26+01:00 Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica Nelson, Demian A Cottle, John M Bindeman, Ilya N Camacho, Alfredo 5209 2022-01-01 application/pdf https://escholarship.org/uc/item/01g8c0x2 unknown eScholarship, University of California qt01g8c0x2 https://escholarship.org/uc/item/01g8c0x2 public Nature Communications, vol 13, iss 1 Earth Sciences Physical Geography and Environmental Geoscience Geochemistry Geology article 2022 ftcdlib 2023-10-16T18:05:26Z 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 (H2Om), 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 40Ar/39Ar 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. Article in Journal/Newspaper Antarc* Antarctica University of California: eScholarship Transantarctic Mountains Butcher Ridge ENVELOPE(155.800,155.800,-79.200,-79.200) |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Geochemistry Geology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Geochemistry Geology Nelson, Demian A Cottle, John M Bindeman, Ilya N Camacho, Alfredo Ultra-depleted hydrogen isotopes in hydrated glass record Late Cretaceous glaciation in Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Geochemistry Geology |
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 (H2Om), 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 40Ar/39Ar 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 |
Article in Journal/Newspaper |
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 |
eScholarship, University of California |
publishDate |
2022 |
url |
https://escholarship.org/uc/item/01g8c0x2 |
op_coverage |
5209 |
long_lat |
ENVELOPE(155.800,155.800,-79.200,-79.200) |
geographic |
Transantarctic Mountains Butcher Ridge |
geographic_facet |
Transantarctic Mountains Butcher Ridge |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Nature Communications, vol 13, iss 1 |
op_relation |
qt01g8c0x2 https://escholarship.org/uc/item/01g8c0x2 |
op_rights |
public |
_version_ |
1782327527253999616 |