Isotope composition and volume of Earth´s early oceans
Oxygen and hydrogen isotope compositions of Earth´s seawater are controlled by volatile fluxes among mantle, lithospheric (oceanic and continental crust), and atmospheric reservoirs. Throughout geologic time the oxygen mass budget was likely conserved within these Earth system reservoirs, but hydrog...
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2012
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ftcopenhagenunip:oai:pure.atira.dk:publications/8c43e54c-e8ea-47f3-ace6-be5ae61f1609 2024-05-19T07:41:21+00:00 Isotope composition and volume of Earth´s early oceans Pope, Emily Catherine Bird, Dennis K. Rosing, Minik Thorleif 2012 https://curis.ku.dk/portal/da/publications/isotope-composition-and-volume-of-earths-early-oceans(8c43e54c-e8ea-47f3-ace6-be5ae61f1609).html https://doi.org/10.1073/pnas.1115705109 eng eng info:eu-repo/semantics/closedAccess Pope , E C , Bird , D K & Rosing , M T 2012 , ' Isotope composition and volume of Earth´s early oceans ' , Proceedings of the National Academy of Science of the United States of America , vol. 109 , no. 12 , pp. 4371-4376 . https://doi.org/10.1073/pnas.1115705109 article 2012 ftcopenhagenunip https://doi.org/10.1073/pnas.1115705109 2024-05-02T00:33:08Z Oxygen and hydrogen isotope compositions of Earth´s seawater are controlled by volatile fluxes among mantle, lithospheric (oceanic and continental crust), and atmospheric reservoirs. Throughout geologic time the oxygen mass budget was likely conserved within these Earth system reservoirs, but hydrogen´s was not, as it can escape to space. Isotopic properties of serpentine from the approximately 3.8 Ga Isua Supracrustal Belt in West Greenland are used to characterize hydrogen and oxygen isotope compositions of ancient seawater. Archaean oceans were depleted in deuterium [expressed as δD relative to Vienna standard mean ocean water (VSMOW)] by at most 25± 5‰, but oxygen isotope ratios were comparable to modern oceans. Mass balance of the global hydrogen budget constrains the contribution of continental growth and planetary hydrogen loss to the secular evolution of hydrogen isotope ratios in Earth´s oceans. Our calculations predict that the oceans of early Earth were up to 26% more voluminous, and atmospheric CH4 and CO2 concentrations determined from limits on hydrogen escape to space are consistent with clement conditions on Archaean Earth. Article in Journal/Newspaper Greenland University of Copenhagen: Research Proceedings of the National Academy of Sciences 109 12 4371 4376 |
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University of Copenhagen: Research |
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ftcopenhagenunip |
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English |
description |
Oxygen and hydrogen isotope compositions of Earth´s seawater are controlled by volatile fluxes among mantle, lithospheric (oceanic and continental crust), and atmospheric reservoirs. Throughout geologic time the oxygen mass budget was likely conserved within these Earth system reservoirs, but hydrogen´s was not, as it can escape to space. Isotopic properties of serpentine from the approximately 3.8 Ga Isua Supracrustal Belt in West Greenland are used to characterize hydrogen and oxygen isotope compositions of ancient seawater. Archaean oceans were depleted in deuterium [expressed as δD relative to Vienna standard mean ocean water (VSMOW)] by at most 25± 5‰, but oxygen isotope ratios were comparable to modern oceans. Mass balance of the global hydrogen budget constrains the contribution of continental growth and planetary hydrogen loss to the secular evolution of hydrogen isotope ratios in Earth´s oceans. Our calculations predict that the oceans of early Earth were up to 26% more voluminous, and atmospheric CH4 and CO2 concentrations determined from limits on hydrogen escape to space are consistent with clement conditions on Archaean Earth. |
format |
Article in Journal/Newspaper |
author |
Pope, Emily Catherine Bird, Dennis K. Rosing, Minik Thorleif |
spellingShingle |
Pope, Emily Catherine Bird, Dennis K. Rosing, Minik Thorleif Isotope composition and volume of Earth´s early oceans |
author_facet |
Pope, Emily Catherine Bird, Dennis K. Rosing, Minik Thorleif |
author_sort |
Pope, Emily Catherine |
title |
Isotope composition and volume of Earth´s early oceans |
title_short |
Isotope composition and volume of Earth´s early oceans |
title_full |
Isotope composition and volume of Earth´s early oceans |
title_fullStr |
Isotope composition and volume of Earth´s early oceans |
title_full_unstemmed |
Isotope composition and volume of Earth´s early oceans |
title_sort |
isotope composition and volume of earth´s early oceans |
publishDate |
2012 |
url |
https://curis.ku.dk/portal/da/publications/isotope-composition-and-volume-of-earths-early-oceans(8c43e54c-e8ea-47f3-ace6-be5ae61f1609).html https://doi.org/10.1073/pnas.1115705109 |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Pope , E C , Bird , D K & Rosing , M T 2012 , ' Isotope composition and volume of Earth´s early oceans ' , Proceedings of the National Academy of Science of the United States of America , vol. 109 , no. 12 , pp. 4371-4376 . https://doi.org/10.1073/pnas.1115705109 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1073/pnas.1115705109 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
109 |
container_issue |
12 |
container_start_page |
4371 |
op_container_end_page |
4376 |
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1799480954411024384 |