Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle
The Paleocene‐Eocene Thermal Maximum (PETM, ca. 56 Ma) is marked by a negative carbon isotope excursion (CIE) and increased global temperatures. The CIE is thought to result from the release of 13C‐depleted carbon, although the source(s) of carbon and triggers for its release, its rate of release, a...
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fttriple:oai:gotriple.eu:10670/1.tyacro 2023-05-15T17:34:42+02:00 Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle Fontorbe, Guillaume Frings, Patrick J. De La Rocha, Christina L. Hendry, Katharine R. Conley, Daniel J. 2020-01-01 https://doi.org/10.1029/2020PA003873 https://archimer.ifremer.fr/doc/00627/73939/73287.pdf https://archimer.ifremer.fr/doc/00627/73939/73288.pdf https://archimer.ifremer.fr/doc/00627/73939/ en eng American Geophysical Union (AGU) doi:10.1029/2020PA003873 10670/1.tyacro https://archimer.ifremer.fr/doc/00627/73939/73287.pdf https://archimer.ifremer.fr/doc/00627/73939/73288.pdf https://archimer.ifremer.fr/doc/00627/73939/ other Archimer, archive institutionnelle de l'Ifremer Paleoceanography and Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2020-05 , Vol. 35 , N. 5 , P. e2020PA003873 (22p.) geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2020 fttriple https://doi.org/10.1029/2020PA003873 2023-01-22T17:55:43Z The Paleocene‐Eocene Thermal Maximum (PETM, ca. 56 Ma) is marked by a negative carbon isotope excursion (CIE) and increased global temperatures. The CIE is thought to result from the release of 13C‐depleted carbon, although the source(s) of carbon and triggers for its release, its rate of release, and the mechanisms by which the Earth system recovered are all debated. Many of the proposed mechanisms for the onset and recovery phases of the PETM make testable predictions about the marine silica cycle, making silicon isotope records a promising tool to address open questions about the PETM. We analyzed silicon isotope ratios (δ30Si) in radiolarian tests and sponge spicules from the Western North Atlantic (ODP Site 1051) across the PETM. Radiolarian δ30Si decreases by 0.6‰ from a background of 1‰ coeval with the CIE, while sponge δ30Si remains consistent at 0.2‰. Using a box model to test the Si cycle response to various scenarios, we find the data are best explained by a weak silicate weathering feedback, implying the recovery was mostly driven by nondiatom organic carbon burial, the other major long‐term carbon sink. We find no resolvable evidence for a volcanic trigger for carbon release, or for a change in regional oceanography. Better understanding of radiolarian Si isotope fractionation and more Si isotope records spanning the PETM are needed to confirm the global validity of these conclusions, but they highlight how the coupling between the silica and carbon cycles can be exploited to yield insight into the functioning of the Earth system. Text North Atlantic Unknown Paleoceanography and Paleoclimatology 35 5 |
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geo envir Fontorbe, Guillaume Frings, Patrick J. De La Rocha, Christina L. Hendry, Katharine R. Conley, Daniel J. Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle |
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geo envir |
description |
The Paleocene‐Eocene Thermal Maximum (PETM, ca. 56 Ma) is marked by a negative carbon isotope excursion (CIE) and increased global temperatures. The CIE is thought to result from the release of 13C‐depleted carbon, although the source(s) of carbon and triggers for its release, its rate of release, and the mechanisms by which the Earth system recovered are all debated. Many of the proposed mechanisms for the onset and recovery phases of the PETM make testable predictions about the marine silica cycle, making silicon isotope records a promising tool to address open questions about the PETM. We analyzed silicon isotope ratios (δ30Si) in radiolarian tests and sponge spicules from the Western North Atlantic (ODP Site 1051) across the PETM. Radiolarian δ30Si decreases by 0.6‰ from a background of 1‰ coeval with the CIE, while sponge δ30Si remains consistent at 0.2‰. Using a box model to test the Si cycle response to various scenarios, we find the data are best explained by a weak silicate weathering feedback, implying the recovery was mostly driven by nondiatom organic carbon burial, the other major long‐term carbon sink. We find no resolvable evidence for a volcanic trigger for carbon release, or for a change in regional oceanography. Better understanding of radiolarian Si isotope fractionation and more Si isotope records spanning the PETM are needed to confirm the global validity of these conclusions, but they highlight how the coupling between the silica and carbon cycles can be exploited to yield insight into the functioning of the Earth system. |
format |
Text |
author |
Fontorbe, Guillaume Frings, Patrick J. De La Rocha, Christina L. Hendry, Katharine R. Conley, Daniel J. |
author_facet |
Fontorbe, Guillaume Frings, Patrick J. De La Rocha, Christina L. Hendry, Katharine R. Conley, Daniel J. |
author_sort |
Fontorbe, Guillaume |
title |
Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle |
title_short |
Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle |
title_full |
Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle |
title_fullStr |
Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle |
title_full_unstemmed |
Constraints on Earth System Functioning at the Paleocene‐Eocene Thermal Maximum From the Marine Silicon Cycle |
title_sort |
constraints on earth system functioning at the paleocene‐eocene thermal maximum from the marine silicon cycle |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020PA003873 https://archimer.ifremer.fr/doc/00627/73939/73287.pdf https://archimer.ifremer.fr/doc/00627/73939/73288.pdf https://archimer.ifremer.fr/doc/00627/73939/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Archimer, archive institutionnelle de l'Ifremer Paleoceanography and Paleoclimatology (2572-4517) (American Geophysical Union (AGU)), 2020-05 , Vol. 35 , N. 5 , P. e2020PA003873 (22p.) |
op_relation |
doi:10.1029/2020PA003873 10670/1.tyacro https://archimer.ifremer.fr/doc/00627/73939/73287.pdf https://archimer.ifremer.fr/doc/00627/73939/73288.pdf https://archimer.ifremer.fr/doc/00627/73939/ |
op_rights |
other |
op_doi |
https://doi.org/10.1029/2020PA003873 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
5 |
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1766133621328969728 |