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Photic zone euxinia during the permian-triassic superanoxic event

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Grice, Kliti
Cao, C.
Love, G.
Bottcher, M.
Twitchett, R.
Grosjean, E.
Summons, R.
Turgeon, S.
Dunning, William
Jin, Y.
Date
2005
Type
Journal Article

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Grice, Kliti and Cao, C. and Love, G. and Bottcher, M. and Twitchett, Richard and Grosjean, E. and Summons, R. and Turgeon, Steven and Dunning, William and Jin, Y. 2005. Photic zone euxinia during the permian-triassic superanoxic event. Science. 307: pp. 706-709.
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Science
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Department of Applied Chemistry
School of Science
Faculty of Science and Engineering
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The link to the journal’s home page is: http://www.sciencemag.org/magazine.dtl

Copyright ©2005 by the American Association for the Advancement of Science; all rights reserved

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Abstract

Carbon and sulfur isotopic data, together with biomarker and iron speciation analyses of the Hovea-3 core that was drilled in the Perth Basin, Western Australia, indicate that euxinic conditions prevailed in the paleowater column during the Permian-Triassic superanoxic event. Biomarkers diagnostic for anoxygenic photosynthesis by Chlorobiaceae are particularly abundant at the boundary and into the Early Triassic. Similar conditions prevailed in the contemporaneous seas off South China. Our evidence for widespread photiczone euxinic conditions suggests that sulfide toxicity was a driver of the extinction and a factor in the protracted recovery.