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Abstract

Mass-independent isotopic signatures for δ33S, δ34S, and δ36S from sulfide and sulfate in Precambrian rocks indicate that a change occurred in the sulfur cycle between 2090 and 2450 million years ago (Ma). Before 2450 Ma, the cycle was influenced by gas-phase atmospheric reactions. These atmospheric reactions also played a role in determining the oxidation state of sulfur, implying that atmospheric oxygen partial pressures were low and that the roles of oxidative weathering and of microbial oxidation and reduction of sulfur were minimal. Atmospheric fractionation processes should be considered in the use of sulfur isotopes to study the onset and consequences of microbial fractionation processes in Earth's early history.

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Those quantities are as follows: Δ33S = 1000*[(1 + δ33S/1000) − (1 + δ34S/1000)0.518 − 1], Δ36S = 1000*[(1 + δ36S/1000) − (1 + δ34S/1000)1.91 − 1], and Δ17O = 1000*[(1 + δ17O/1000) − (1 + δ18O/1000)0.52 − 1]. Uncertainties for Δ33S, Δ36S, and Δ17O are better than ±0.05, 0.3, and 0.05‰, respectively.
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Supported by grants from NSF, NASA, and Calspace. Samples used in this study were supplied and/or collected by J. W. Schopf, B. Runnegar, D. Lowe, H. Baadsgaard, and S. J. Mojzsis. The interpretations herein are our responsibility, but they have benefited from interesting conversations and questions from R. N. Clayton, K. Boering, T. Chacko, D. DePaolo, H. D. Holland, M. Humayun, J. Kasting, A. Knoll, S. J. Mojzsis, A. Payton, G. Retallack, and K. K. Turekian. We thank D. Canfield and J. Kasting for providing copies of in press and unpublished materials.

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Published In

Science
Volume 289 | Issue 5480
4 August 2000

Submission history

Received: 12 May 2000
Accepted: 9 June 2000
Published in print: 4 August 2000

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James Farquhar*
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA. E-mail: [email protected] (J.F.); [email protected] (H.B.); and [email protected] (M.T.)
Huiming Bao
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA. E-mail: [email protected] (J.F.); [email protected] (H.B.); and [email protected] (M.T.)
Mark Thiemens
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA. E-mail: [email protected] (J.F.); [email protected] (H.B.); and [email protected] (M.T.)

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