I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air
Abstract Remnants of shooting stars are preserved in form of cosmic spherules in ice and sediments. The extraterrestrial material is heated and melted upon atmospheric entry and is collected at the Earth's surface as cosmic spherules. A fraction of cosmic spherules (I‐type cosmic spherules) sou...
Published in: | Paleoceanography and Paleoclimatology |
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Language: | English |
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2021
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Online Access: | https://resolver.sub.uni-goettingen.de/purl?gro-2/133812 https://doi.org/10.1029/2020PA004159 |
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ftsubgoettingen:oai:publications.goettingen-research-online.de:2/133812 2023-11-05T03:37:04+01:00 I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air Fischer, Meike B. Oeser, Martin Weyer, Stefan Folco, Luigi Peters, Stefan T. M. Zahnow, Fabian Pack, Andreas Fischer, Meike B. Oeser, Martin Weyer, Stefan Folco, Luigi Peters, Stefan T. M. Zahnow, Fabian Pack, Andreas 2021 https://resolver.sub.uni-goettingen.de/purl?gro-2/133812 https://doi.org/10.1029/2020PA004159 en eng https://resolver.sub.uni-goettingen.de/purl?gro-2/133812 doi:10.1029/2020PA004159 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/article journal_article yes 2021 ftsubgoettingen https://doi.org/10.1029/2020PA004159 2023-10-08T16:57:58Z Abstract Remnants of shooting stars are preserved in form of cosmic spherules in ice and sediments. The extraterrestrial material is heated and melted upon atmospheric entry and is collected at the Earth's surface as cosmic spherules. A fraction of cosmic spherules (I‐type cosmic spherules) sources from extraterrestrial Fe,Ni metal. These metal particles melt and become oxidized in the atmosphere. The oxygen in the resulting oxides (magnetite, wüstite) sources entirely from the atmosphere. Here, we demonstrate that I‐type cosmic spherules can be used to reconstruct the triple oxygen isotope anomaly of the past atmosphere, which provides information on the gross primary productivity and/or paleo‐CO 2 levels. We present a calibration of the proxy using Antarctic cosmic spherules. We further introduce Δ′ 56 Fe and demonstrate that triple iron isotopes can be used to obtain information about the underlying fractionation mechanism (e.g., kinetic vs. equilibrium fractionation). Key Points We demonstrate that I‐type cosmic spherules can be used to determine the isotope composition of air Article in Journal/Newspaper Antarc* Antarctic Georg-August-Universität Göttingen: GoeScholar Paleoceanography and Paleoclimatology 36 3 |
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Open Polar |
collection |
Georg-August-Universität Göttingen: GoeScholar |
op_collection_id |
ftsubgoettingen |
language |
English |
description |
Abstract Remnants of shooting stars are preserved in form of cosmic spherules in ice and sediments. The extraterrestrial material is heated and melted upon atmospheric entry and is collected at the Earth's surface as cosmic spherules. A fraction of cosmic spherules (I‐type cosmic spherules) sources from extraterrestrial Fe,Ni metal. These metal particles melt and become oxidized in the atmosphere. The oxygen in the resulting oxides (magnetite, wüstite) sources entirely from the atmosphere. Here, we demonstrate that I‐type cosmic spherules can be used to reconstruct the triple oxygen isotope anomaly of the past atmosphere, which provides information on the gross primary productivity and/or paleo‐CO 2 levels. We present a calibration of the proxy using Antarctic cosmic spherules. We further introduce Δ′ 56 Fe and demonstrate that triple iron isotopes can be used to obtain information about the underlying fractionation mechanism (e.g., kinetic vs. equilibrium fractionation). Key Points We demonstrate that I‐type cosmic spherules can be used to determine the isotope composition of air |
author2 |
Fischer, Meike B. Oeser, Martin Weyer, Stefan Folco, Luigi Peters, Stefan T. M. Zahnow, Fabian Pack, Andreas |
format |
Article in Journal/Newspaper |
author |
Fischer, Meike B. Oeser, Martin Weyer, Stefan Folco, Luigi Peters, Stefan T. M. Zahnow, Fabian Pack, Andreas |
spellingShingle |
Fischer, Meike B. Oeser, Martin Weyer, Stefan Folco, Luigi Peters, Stefan T. M. Zahnow, Fabian Pack, Andreas I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air |
author_facet |
Fischer, Meike B. Oeser, Martin Weyer, Stefan Folco, Luigi Peters, Stefan T. M. Zahnow, Fabian Pack, Andreas |
author_sort |
Fischer, Meike B. |
title |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air |
title_short |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air |
title_full |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air |
title_fullStr |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air |
title_full_unstemmed |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quaternary Air |
title_sort |
i‐type cosmic spherules as proxy for the δ′ 17 o of the atmosphere—a calibration with quaternary air |
publishDate |
2021 |
url |
https://resolver.sub.uni-goettingen.de/purl?gro-2/133812 https://doi.org/10.1029/2020PA004159 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://resolver.sub.uni-goettingen.de/purl?gro-2/133812 doi:10.1029/2020PA004159 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.1029/2020PA004159 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
3 |
_version_ |
1781692533351383040 |