Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems
The presence of Paleoproterozoic glacial diamictites deposited at low latitudes on different continents indicates that three or four worldwide glaciations occurred between 2.45 and 2.22 Ga. During that time period, the first atmospheric oxygen rise, known as the Great Oxidation Event (GOE), occurred...
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ftunivgeneve:oai:unige.ch:unige:94788 2023-05-15T17:01:11+02:00 Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems Zakharov, D.O. Bindeman, I.N. Slabunov, A.I. Ovtcharova, Maria Coble, M.A. Serebryakov, N.S. Schaltegger, Urs 2017 https://archive-ouverte.unige.ch/unige:94788 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1130/G38759.1 unige:94788 https://archive-ouverte.unige.ch/unige:94788 info:eu-repo/semantics/restrictedAccess ISSN: 0091-7613 Geology, Vol. 45, No 7 (2017) pp. 667-670 info:eu-repo/classification/ddc/550 Paleoproterozoic Snowball Earth Zircon U-Pb Great Oxidation Event Text info:eu-repo/semantics/article Article scientifique info:eu-repo/semantics/publishedVersion 2017 ftunivgeneve https://doi.org/10.1130/G38759.1 2022-02-08T22:36:24Z The presence of Paleoproterozoic glacial diamictites deposited at low latitudes on different continents indicates that three or four worldwide glaciations occurred between 2.45 and 2.22 Ga. During that time period, the first atmospheric oxygen rise, known as the Great Oxidation Event (GOE), occurred, implying a potential connection between these events. Herein we combine triple oxygen isotope systematics and in situ and high-precision U-Pb zircon ages of mafic intrusions to date two episodes of snowball Earth glaciations. Subglacial hydrothermal alteration was induced by intrusions of high- Mg and high-Fe gabbros during the early Paleoproterozoic rifting on the Baltic Shield, which at the time was located at low latitudes. The low d18O values of hydrothermally altered rocks associated with these intrusions are attributed to high-temperature isotopic exchange between hot rock and glacial meltwater, indicating the presence of glacial ice globally. The triple oxygen isotope approach is used here to show that the d18O of glacial meltwaters during the dated episodes of snowball Earth glaciation was approximately –40 permil VSMOW (Vienna standard mean ocean water). High-Mg gabbro intrusions and associated low-d18O hydrothermally altered rocks formed during the earliest episode of snowball Earth glaciation between 2.43 and 2.41 Ga. High-Fe gabbro from the Khitoostrov locality (Karelia, Russia) hosts a d18O value of −27.3 permil and is dated here at 2291 ± 8 Ma. This age is interpreted to reflect the interaction between the intrusion and glacial meltwaters during the third Paleoproterozoic glaciation, which occurred after the GOE. Article in Journal/Newspaper karelia* Université de Genève: Archive ouverte UNIGE Geology 45 7 667 670 |
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Université de Genève: Archive ouverte UNIGE |
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ftunivgeneve |
language |
English |
topic |
info:eu-repo/classification/ddc/550 Paleoproterozoic Snowball Earth Zircon U-Pb Great Oxidation Event |
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info:eu-repo/classification/ddc/550 Paleoproterozoic Snowball Earth Zircon U-Pb Great Oxidation Event Zakharov, D.O. Bindeman, I.N. Slabunov, A.I. Ovtcharova, Maria Coble, M.A. Serebryakov, N.S. Schaltegger, Urs Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems |
topic_facet |
info:eu-repo/classification/ddc/550 Paleoproterozoic Snowball Earth Zircon U-Pb Great Oxidation Event |
description |
The presence of Paleoproterozoic glacial diamictites deposited at low latitudes on different continents indicates that three or four worldwide glaciations occurred between 2.45 and 2.22 Ga. During that time period, the first atmospheric oxygen rise, known as the Great Oxidation Event (GOE), occurred, implying a potential connection between these events. Herein we combine triple oxygen isotope systematics and in situ and high-precision U-Pb zircon ages of mafic intrusions to date two episodes of snowball Earth glaciations. Subglacial hydrothermal alteration was induced by intrusions of high- Mg and high-Fe gabbros during the early Paleoproterozoic rifting on the Baltic Shield, which at the time was located at low latitudes. The low d18O values of hydrothermally altered rocks associated with these intrusions are attributed to high-temperature isotopic exchange between hot rock and glacial meltwater, indicating the presence of glacial ice globally. The triple oxygen isotope approach is used here to show that the d18O of glacial meltwaters during the dated episodes of snowball Earth glaciation was approximately –40 permil VSMOW (Vienna standard mean ocean water). High-Mg gabbro intrusions and associated low-d18O hydrothermally altered rocks formed during the earliest episode of snowball Earth glaciation between 2.43 and 2.41 Ga. High-Fe gabbro from the Khitoostrov locality (Karelia, Russia) hosts a d18O value of −27.3 permil and is dated here at 2291 ± 8 Ma. This age is interpreted to reflect the interaction between the intrusion and glacial meltwaters during the third Paleoproterozoic glaciation, which occurred after the GOE. |
format |
Article in Journal/Newspaper |
author |
Zakharov, D.O. Bindeman, I.N. Slabunov, A.I. Ovtcharova, Maria Coble, M.A. Serebryakov, N.S. Schaltegger, Urs |
author_facet |
Zakharov, D.O. Bindeman, I.N. Slabunov, A.I. Ovtcharova, Maria Coble, M.A. Serebryakov, N.S. Schaltegger, Urs |
author_sort |
Zakharov, D.O. |
title |
Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems |
title_short |
Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems |
title_full |
Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems |
title_fullStr |
Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems |
title_full_unstemmed |
Dating the Paleoproterozoic snowball Earth glaciations using contemporaneous subglacial hydrothermal systems |
title_sort |
dating the paleoproterozoic snowball earth glaciations using contemporaneous subglacial hydrothermal systems |
publishDate |
2017 |
url |
https://archive-ouverte.unige.ch/unige:94788 |
genre |
karelia* |
genre_facet |
karelia* |
op_source |
ISSN: 0091-7613 Geology, Vol. 45, No 7 (2017) pp. 667-670 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1130/G38759.1 unige:94788 https://archive-ouverte.unige.ch/unige:94788 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1130/G38759.1 |
container_title |
Geology |
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45 |
container_issue |
7 |
container_start_page |
667 |
op_container_end_page |
670 |
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1766054241694121984 |