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Marine diagenesis of tephra aided the Palaeocene-Eocene Thermal Maximum termination

Marine diagenesis of tephra aided the Palaeocene-Eocene Thermal Maximum termination
Marine diagenesis of tephra aided the Palaeocene-Eocene Thermal Maximum termination
The Palaeocene-Eocene Thermal Maximum (PETM) was a period of intense global warming that began ~55.9 million years ago and lasted about 170,000 years. Various mechanisms have been proposed to cause this warming, including the emplacement of the North Atlantic Igneous Province (NAIP). Equally, many mechanisms have been invoked to explain sequestration of carbon from the ocean-atmosphere system necessary to promote the recovery to more temperate conditions. Here we propose that an important path for carbon sequestration was tied to NAIP volcanism through the precipitation of calcium carbonate (CaCO3) cements within the tephra layers. These cements formed after the deposition and burial of tephra over a wide area of the North Atlantic Ocean during the late Palaeocene and early Eocene. We find strong evidence that authigenic CaCO3 cements formed shortly after tephra deposition. Monte Carlo simulations suggest that this process may have been responsible for a quarter of the carbon sequestered during the PETM recovery phase, providing a major, but previously unconsidered sink of isotopically-light carbon, and one
41 which may have persisted into the Eocene.
0012-821X
Longman, Jack
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Gernon, Thomas
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Palmer, Martin
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Jones, Morgan
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Stokke, Ella
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Svensen, Henrik
15fa7bc4-71fa-4962-a477-49b7e58584e4
Longman, Jack
26a3c4e3-79d6-4102-9708-a5b02b97121d
Gernon, Thomas
658041a0-fdd1-4516-85f4-98895a39235e
Palmer, Martin
d2e60e81-5d6e-4ddb-a243-602537286080
Jones, Morgan
cf1c7a87-0578-4e4b-8708-a22a5b9e7df4
Stokke, Ella
904b2cd8-bfcf-46e8-bf84-391762f9d4b7
Svensen, Henrik
15fa7bc4-71fa-4962-a477-49b7e58584e4

Longman, Jack, Gernon, Thomas, Palmer, Martin, Jones, Morgan, Stokke, Ella and Svensen, Henrik (2021) Marine diagenesis of tephra aided the Palaeocene-Eocene Thermal Maximum termination. Earth and Planetary Science Letters, [EPSL-D-21-00027]. (In Press)

Record type: Article

Abstract

The Palaeocene-Eocene Thermal Maximum (PETM) was a period of intense global warming that began ~55.9 million years ago and lasted about 170,000 years. Various mechanisms have been proposed to cause this warming, including the emplacement of the North Atlantic Igneous Province (NAIP). Equally, many mechanisms have been invoked to explain sequestration of carbon from the ocean-atmosphere system necessary to promote the recovery to more temperate conditions. Here we propose that an important path for carbon sequestration was tied to NAIP volcanism through the precipitation of calcium carbonate (CaCO3) cements within the tephra layers. These cements formed after the deposition and burial of tephra over a wide area of the North Atlantic Ocean during the late Palaeocene and early Eocene. We find strong evidence that authigenic CaCO3 cements formed shortly after tephra deposition. Monte Carlo simulations suggest that this process may have been responsible for a quarter of the carbon sequestered during the PETM recovery phase, providing a major, but previously unconsidered sink of isotopically-light carbon, and one
41 which may have persisted into the Eocene.

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EPSL-D-21-00027
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Accepted/In Press date: 2 July 2021

Identifiers

Local EPrints ID: 450250
URI: http://eprints.soton.ac.uk/id/eprint/450250
ISSN: 0012-821X
PURE UUID: 2d1cf4c0-5bbe-4b2c-b869-5df082391809

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Date deposited: 19 Jul 2021 16:36
Last modified: 19 Jul 2021 16:36

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Contributors

Author: Jack Longman
Author: Thomas Gernon
Author: Martin Palmer
Author: Morgan Jones
Author: Ella Stokke
Author: Henrik Svensen

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