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Episodic photic zone euxinia in the northeastern Panthalassic Ocean during the end-Triassic extinction

Episodic photic zone euxinia in the northeastern Panthalassic Ocean during the end-Triassic extinction
Episodic photic zone euxinia in the northeastern Panthalassic Ocean during the end-Triassic extinction
Severe changes in ocean redox, nutrient cycling, and marine productivity accompanied most Phanerozoic mass extinctions. However, evidence for marine photic zone euxinia (PZE) as a globally important extinction mechanism for the end-Triassic extinction (ETE) is currently lacking. Fossil molecular (biomarker) and nitrogen isotopic records from a sedimentary sequence in western Canada provide the first conclusive evidence of PZE and disrupted biogeochemistry in neritic waters of the Panthalassic Ocean during the end Triassic. Increasing water-column stratification and deoxygenation across the ETE led to PZE in the Early Jurassic, paralleled by a perturbed nitrogen cycle and ecological turnovers among noncalcifying groups, including eukaryotic algae and prokaryotic plankton. If such conditions developed widely in the Panthalassic Ocean, PZE might have been a potent mechanism for the ETE.
0091-7613
307-310
Kasprak, A.H.
ff41f7f1-c19a-4c1d-b8c4-f472fdec4912
Sepulveda, J.
a184604b-2516-4d6c-91c4-df798db062f5
Price-Waldman, R.
6c0a52f3-ca98-4c49-83da-8bffcb79750a
Williford, K.H.
cbc9e998-2bc4-4159-b0bc-bce0651deae1
Schoepfer, S.D.
e7723162-b77c-46ff-8f25-b81cf4b7cc49
Haggart, J.W.
1aefeade-df78-400f-8099-a93b96a83ace
Ward, P.D.
aa238378-9574-4a5b-a301-3814bc8fe35d
Summons, R.E.
f90b1f29-1d83-493d-9277-0f627d8a178d
Whiteside, J.H.
5d9ad7aa-eba3-4ad9-9f6f-81be71b6829b
Kasprak, A.H.
ff41f7f1-c19a-4c1d-b8c4-f472fdec4912
Sepulveda, J.
a184604b-2516-4d6c-91c4-df798db062f5
Price-Waldman, R.
6c0a52f3-ca98-4c49-83da-8bffcb79750a
Williford, K.H.
cbc9e998-2bc4-4159-b0bc-bce0651deae1
Schoepfer, S.D.
e7723162-b77c-46ff-8f25-b81cf4b7cc49
Haggart, J.W.
1aefeade-df78-400f-8099-a93b96a83ace
Ward, P.D.
aa238378-9574-4a5b-a301-3814bc8fe35d
Summons, R.E.
f90b1f29-1d83-493d-9277-0f627d8a178d
Whiteside, J.H.
5d9ad7aa-eba3-4ad9-9f6f-81be71b6829b

Kasprak, A.H., Sepulveda, J., Price-Waldman, R., Williford, K.H., Schoepfer, S.D., Haggart, J.W., Ward, P.D., Summons, R.E. and Whiteside, J.H. (2015) Episodic photic zone euxinia in the northeastern Panthalassic Ocean during the end-Triassic extinction. Geology, 43 (4), 307-310. (doi:10.1130/G36371.1).

Record type: Article

Abstract

Severe changes in ocean redox, nutrient cycling, and marine productivity accompanied most Phanerozoic mass extinctions. However, evidence for marine photic zone euxinia (PZE) as a globally important extinction mechanism for the end-Triassic extinction (ETE) is currently lacking. Fossil molecular (biomarker) and nitrogen isotopic records from a sedimentary sequence in western Canada provide the first conclusive evidence of PZE and disrupted biogeochemistry in neritic waters of the Panthalassic Ocean during the end Triassic. Increasing water-column stratification and deoxygenation across the ETE led to PZE in the Early Jurassic, paralleled by a perturbed nitrogen cycle and ecological turnovers among noncalcifying groups, including eukaryotic algae and prokaryotic plankton. If such conditions developed widely in the Panthalassic Ocean, PZE might have been a potent mechanism for the ETE.

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More information

Published date: April 2015
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 376387
URI: http://eprints.soton.ac.uk/id/eprint/376387
ISSN: 0091-7613
PURE UUID: 17962b6a-c843-4f33-b378-09e788a5c18e

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Date deposited: 20 Apr 2015 13:06
Last modified: 14 Mar 2024 19:42

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Contributors

Author: A.H. Kasprak
Author: J. Sepulveda
Author: R. Price-Waldman
Author: K.H. Williford
Author: S.D. Schoepfer
Author: J.W. Haggart
Author: P.D. Ward
Author: R.E. Summons
Author: J.H. Whiteside

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