Articles | Volume 12, issue 7
https://doi.org/10.5194/bg-12-2131-2015
https://doi.org/10.5194/bg-12-2131-2015
Research article
 | 
10 Apr 2015
Research article |  | 10 Apr 2015

Reconstruction of secular variation in seawater sulfate concentrations

T. J. Algeo, G. M. Luo, H. Y. Song, T. W. Lyons, and D. E. Canfield

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Thomas Algeo on behalf of the Authors (24 Jan 2015)  Author's response   Manuscript 
ED: Referee Nomination & Report Request started (08 Feb 2015) by Caroline P. Slomp
RR by Anonymous Referee #2 (13 Feb 2015)
RR by Ulrich Wortmann (03 Mar 2015)
ED: Publish subject to technical corrections (18 Mar 2015) by Caroline P. Slomp
AR by Thomas Algeo on behalf of the Authors (20 Mar 2015)  Manuscript 
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Short summary
Seawater sulfate concentrations are closely related to the oxygenation history of Earth's surface environment. We develop two approaches for quantification of ancient seawater sulfate concentrations based on the sulfur isotopic composition of pyrite and carbonate-associated sulfur (CAS). Our analysis indicates low seawater sulfate (<5mM) at 635 million years ago, rising in a stepwise manner to near-modern levels (~20-30mM) by about 250 million years ago.
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