Details
| Original language | English |
|---|---|
| Article number | e2020PA004159 |
| Journal | Paleoceanography and Paleoclimatology |
| Volume | 36 |
| Issue number | 3 |
| Publication status | Published - 17 Feb 2021 |
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-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).
Keywords
- atmosphere, cosmic, isotopes, oxygen, spherules
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Oceanography
- Earth and Planetary Sciences(all)
- Atmospheric Science
- Earth and Planetary Sciences(all)
- Palaeontology
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In: Paleoceanography and Paleoclimatology, Vol. 36, No. 3, e2020PA004159, 17.02.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - I-Type Cosmic Spherules as Proxy for the Δ′17O of the Atmosphere
T2 - A Calibration With Quraternary Air
AU - Fischer, Meike B.
AU - Oeser, Martin
AU - Weyer, Stefan
AU - Folco, Luigi
AU - Peters, Stefan T.M.
AU - Zahnow, Fabian
AU - Pack, Andreas
PY - 2021/2/17
Y1 - 2021/2/17
N2 - 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).
AB - 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).
KW - atmosphere
KW - cosmic
KW - isotopes
KW - oxygen
KW - spherules
UR - http://www.scopus.com/inward/record.url?scp=85103222977&partnerID=8YFLogxK
U2 - 10.1029/2020PA004159
DO - 10.1029/2020PA004159
M3 - Article
AN - SCOPUS:85103222977
VL - 36
JO - Paleoceanography and Paleoclimatology
JF - Paleoceanography and Paleoclimatology
SN - 2572-4517
IS - 3
M1 - e2020PA004159
ER -