Calcium isotope constraints on the end-Permian mass extinction

Payne, Jonathan L. and Turchyn, Alexandra V. and Paytan, Adina and DePaolo, Donald J. and Lehrmann, Daniel J. and Yu, Meiyi and Wei, Jiayong (2010) Calcium isotope constraints on the end-Permian mass extinction. Proceedings of the National Academy of Sciences of the United States of America, 107 (19). 8543 -8548. ISSN 0027-8424 Online ISSN 1091-6490 DOI 10.1073/pnas.0914065107

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Official URL: http://www.pnas.org/content/107/19/8543.abstract

Abstract

The end-Permian mass extinction horizon is marked by an abrupt shift in style of carbonate sedimentation and a negative excursion in the carbon isotope (δ13C) composition of carbonate minerals. Several extinction scenarios consistent with these observations have been put forward. Secular variation in the calcium isotope (δ44/40Ca) composition of marine sediments provides a tool for distinguishing among these possibilities and thereby constraining the causes of mass extinction. Here we report δ44/40Ca across the Permian-Triassic boundary from marine limestone in south China. The δ44/40Ca exhibits a transient negative excursion of ∼0.3‰ over a few hundred thousand years or less, which we interpret to reflect a change in the global δ44/40Ca composition of seawater. CO2-driven ocean acidification best explains the coincidence of the δ44/40Ca excursion with negative excursions in the δ13C of carbonates and organic matter and the preferential extinction of heavily calcified marine animals. Calcium isotope constraints on carbon cycle calculations suggest that the average δ13C of CO2 released was heavier than -28‰ and more likely near -15‰; these values indicate a source containing substantial amounts of mantle- or carbonate-derived carbon. Collectively, the results point toward Siberian Trap volcanism as the trigger of mass extinction.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA62;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Proceedings of the National Academy of Sciences of the United States of America
Volume: 107
Page Range: 8543 -8548
Identification Number: 10.1073/pnas.0914065107
Depositing User: Sarah Humbert
Date Deposited: 28 Feb 2011 22:37
Last Modified: 23 Jul 2013 10:01
URI: http://eprints.esc.cam.ac.uk/id/eprint/2022

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