I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quraternary Air
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...
Published in: | Paleoceanography and Paleoclimatology |
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Format: | Article in Journal/Newspaper |
Language: | English French |
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2021
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Online Access: | http://hdl.handle.net/11568/1094340 https://doi.org/10.1029/2020PA004159 |
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ftunivpisairis:oai:arpi.unipi.it:11568/1094340 2023-11-12T04:04:11+01:00 I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quraternary 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 ELETTRONICO http://hdl.handle.net/11568/1094340 https://doi.org/10.1029/2020PA004159 eng fre eng fre volume:36 issue:3 journal:PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY http://hdl.handle.net/11568/1094340 doi:10.1029/2020PA004159 Microeteorites Oxygen isotopes Fractionation Paleo atmosphere info:eu-repo/semantics/article 2021 ftunivpisairis https://doi.org/10.1029/2020PA004159 2023-10-17T21:56:04Z 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- CO2 levels. We present a calibration of the proxy using Antarctic cosmic spherules. We further introduce Δ′56Fe and demonstrate that triple iron isotopes can be used to obtain information about the underlying fractionation mechanism (e.g., kinetic vs. equilibrium fractionation). Article in Journal/Newspaper Antarc* Antarctic ARPI - Archivio della Ricerca dell'Università di Pisa Antarctic Paleoceanography and Paleoclimatology 36 3 |
institution |
Open Polar |
collection |
ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English French |
topic |
Microeteorites Oxygen isotopes Fractionation Paleo atmosphere |
spellingShingle |
Microeteorites Oxygen isotopes Fractionation Paleo atmosphere 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 Quraternary Air |
topic_facet |
Microeteorites Oxygen isotopes Fractionation Paleo atmosphere |
description |
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- CO2 levels. We present a calibration of the proxy using Antarctic cosmic spherules. We further introduce Δ′56Fe and demonstrate that triple iron isotopes can be used to obtain information about the underlying fractionation mechanism (e.g., kinetic vs. equilibrium fractionation). |
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 |
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 Quraternary Air |
title_short |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quraternary Air |
title_full |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quraternary Air |
title_fullStr |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quraternary Air |
title_full_unstemmed |
I‐Type Cosmic Spherules as Proxy for the Δ′ 17 O of the Atmosphere—A Calibration With Quraternary Air |
title_sort |
i‐type cosmic spherules as proxy for the δ′ 17 o of the atmosphere—a calibration with quraternary air |
publishDate |
2021 |
url |
http://hdl.handle.net/11568/1094340 https://doi.org/10.1029/2020PA004159 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
volume:36 issue:3 journal:PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY http://hdl.handle.net/11568/1094340 doi:10.1029/2020PA004159 |
op_doi |
https://doi.org/10.1029/2020PA004159 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
36 |
container_issue |
3 |
_version_ |
1782340987873394688 |