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Neocarchean carbonate-associated sulfate records positive Δ^(33)S anomalies

Paris, G. and Adkins, J. F. and Sessions, A. L. and Webb, S. M. and Fischer, W. W. (2014) Neocarchean carbonate-associated sulfate records positive Δ^(33)S anomalies. Science, 346 (6410). pp. 739-741. ISSN 0036-8075.

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Mass-independent fractionation of sulfur isotopes (reported as Δ^(33S) recorded in Archean sedimentary rocks helps to constrain the composition of Earth’s early atmosphere and the timing of the rise of oxygen ~2.4 billion years ago. Although current hypotheses predict uniformly negative Δ^(33)S for Archean seawater sulfate, this remains untested through the vast majority of Archean time.We applied x-ray absorption spectroscopy to investigate the low sulfate content of particularly well-preserved Neoarchean carbonates and mass spectrometry to measure their Δ^(33)S signatures. We report unexpected, large, widespread positive Δ^(33)S values from stratigraphic sections capturing over 70 million years and diverse depositional environments. Combined with the pyrite record, these results show that sulfate does not carry the expected negative Δ^(33)S from sulfur mass-independent fractionation in the Neoarchean atmosphere.

Item Type:Article
Related URLs:
URLURL TypeDescription 10.1126/science.1258211 PublisherArticle Material
Paris, G.0000-0001-8368-1224
Adkins, J. F.0000-0002-3174-5190
Sessions, A. L.0000-0001-6120-2763
Fischer, W. W.0000-0002-8836-3054
Alternate Title:Neocarchean carbonate-associated sulfate records positive 33S anomalies
Additional Information:© 2014 American Association for the Advancement of Science. Received for publication 2 July 2014. Accepted for publication 22 September 2014. We thank J. Johnson for help with stratigraphic sample collection and fruitful comments; N. Beukes and I. Halevy for helpful discussions; K. Bergmann for assistance with C and O analyses; and C. Ma, T. Present, and J. Johnson for assistance with scanning electron microscopy. We acknowledge support from NSF Division of Earth Sciences award no. EAR-1349858. Assistance from N. Dalleska and use of IC instrumentation in the Environmental Analysis Center at the California Institute of Technology is gratefully acknowledged. G.P. was funded by the Henry and Camille Dreyfus Postdoctoral Program in Environmental Chemistry. W.W.F. acknowledges support from the David and Lucile Packard Foundation. Drill core GKP01 was sampled with support from the Agouron Institute. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. The SSRL Structural Molecular Biology Program is supported by the DOE Office of Biological and Environmental Research and by the National Institutes of Health, National Institute of General Medical Sciences (including P41GM103393).
Funding AgencyGrant Number
Camille and Henry Dreyfus FoundationUNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Agouron InstituteUNSPECIFIED
Department of Energy (DOE)DE-AC02-76SF00515
Issue or Number:6410
Record Number:CaltechAUTHORS:20141009-161941084
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50323
Deposited By: George Porter
Deposited On:06 Nov 2014 19:40
Last Modified:09 Mar 2020 13:19

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