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Evidence for shelf acidification during the onset of the Paleocene-Eocene Thermal Maximum

Evidence for shelf acidification during the onset of the Paleocene-Eocene Thermal Maximum
Evidence for shelf acidification during the onset of the Paleocene-Eocene Thermal Maximum
A transect of paleoshelf cores from Maryland and New Jersey contains an ~0.19‐ to 1.61‐m‐thick interval with reduced percentages of carbonate during the onset of the Paleocene‐Eocene Thermal Maximum (PETM). Outer paleoshelf cores are barren of nannofossils and correspond to two minor disconformities. Middle paleoshelf cores contain a mixture of samples devoid of nannofossils and those with rare specimens characterized by significant dissolution (i.e., etching). The magnitude of the decrease in carbonate cannot be explained by dilution by clastic material or dissolution resulting from the oxidation of organic matter during early diagenesis. The observed preservation pattern implies a shoaling of the calcite compensation depth and lysocline to the middle shelf. This reduced carbonate interval is observed during the onset of the PETM on other continental margins raising the possibility that extreme shoaling of the calcite compensation depth and lysocline was a global signal, which is more significant than in previous estimates for the PETM. An alternative scenario is that shoaling was restricted to the northwest Atlantic, enhanced by regional and local factors (eutrophication from rivers and microbial activity associated with warming) that exacerbated the impact of acidification on the shelf.
2572-4517
Bralower, Timothy J.
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Kump, Lee R.
55a44fcd-b2fd-4123-bdff-c3ab5087e9c5
Self-trail, Jean M.
19d9a8ae-7deb-4a7e-b55e-10a4d010252f
Robinson, Marci M.
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Lyons, Shelby
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Babila, Tali
a59f9473-d145-4d43-92c0-ea682f29fdcc
Ballaron, Edward
6bd2a732-3c36-42db-9f3e-cc5f757acade
Freeman, Katherine H.
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Hajek, Elizabeth
1be7f375-3112-473d-b498-0e853d48488d
Rush, William
042939e9-5074-4a84-aa57-c5eaf38b218d
Zachos, James C.
c262d59f-aadc-4e09-b844-098db9a0e3c5
Bralower, Timothy J.
8d16a733-85c8-4837-aa95-f070d61494a7
Kump, Lee R.
55a44fcd-b2fd-4123-bdff-c3ab5087e9c5
Self-trail, Jean M.
19d9a8ae-7deb-4a7e-b55e-10a4d010252f
Robinson, Marci M.
59f40b6d-1f67-4d3a-aadd-aa75393c9237
Lyons, Shelby
5f8312e6-99dd-4155-90f0-1af8aebbbfaa
Babila, Tali
a59f9473-d145-4d43-92c0-ea682f29fdcc
Ballaron, Edward
6bd2a732-3c36-42db-9f3e-cc5f757acade
Freeman, Katherine H.
d9200932-f523-44ed-a2de-da760d145ff0
Hajek, Elizabeth
1be7f375-3112-473d-b498-0e853d48488d
Rush, William
042939e9-5074-4a84-aa57-c5eaf38b218d
Zachos, James C.
c262d59f-aadc-4e09-b844-098db9a0e3c5

Bralower, Timothy J., Kump, Lee R., Self-trail, Jean M., Robinson, Marci M., Lyons, Shelby, Babila, Tali, Ballaron, Edward, Freeman, Katherine H., Hajek, Elizabeth, Rush, William and Zachos, James C. (2018) Evidence for shelf acidification during the onset of the Paleocene-Eocene Thermal Maximum. Paleoceanography and Paleoclimatology. (doi:10.1029/2018PA003382).

Record type: Article

Abstract

A transect of paleoshelf cores from Maryland and New Jersey contains an ~0.19‐ to 1.61‐m‐thick interval with reduced percentages of carbonate during the onset of the Paleocene‐Eocene Thermal Maximum (PETM). Outer paleoshelf cores are barren of nannofossils and correspond to two minor disconformities. Middle paleoshelf cores contain a mixture of samples devoid of nannofossils and those with rare specimens characterized by significant dissolution (i.e., etching). The magnitude of the decrease in carbonate cannot be explained by dilution by clastic material or dissolution resulting from the oxidation of organic matter during early diagenesis. The observed preservation pattern implies a shoaling of the calcite compensation depth and lysocline to the middle shelf. This reduced carbonate interval is observed during the onset of the PETM on other continental margins raising the possibility that extreme shoaling of the calcite compensation depth and lysocline was a global signal, which is more significant than in previous estimates for the PETM. An alternative scenario is that shoaling was restricted to the northwest Atlantic, enhanced by regional and local factors (eutrophication from rivers and microbial activity associated with warming) that exacerbated the impact of acidification on the shelf.

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More information

Accepted/In Press date: 2 October 2018
e-pub ahead of print date: 12 October 2018

Identifiers

Local EPrints ID: 427331
URI: https://eprints.soton.ac.uk/id/eprint/427331
ISSN: 2572-4517
PURE UUID: 6f0eeee6-85d8-4c0e-9909-45d4f4f6cee9

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Date deposited: 14 Jan 2019 17:30
Last modified: 14 Jan 2019 17:30

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Contributors

Author: Timothy J. Bralower
Author: Lee R. Kump
Author: Jean M. Self-trail
Author: Marci M. Robinson
Author: Shelby Lyons
Author: Tali Babila
Author: Edward Ballaron
Author: Katherine H. Freeman
Author: Elizabeth Hajek
Author: William Rush
Author: James C. Zachos

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