Calibration of Sulfate Levels in the Archean Ocean-Reference-Cited by-同舟云学术

Calibration of Sulfate Levels in the Archean Ocean

Published:2002-12-20 Issue:5602 Volume:298 Page:2372-2374
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Habicht Kirsten S.¹,Gade Michael¹,Thamdrup Bo¹,Berg Peter²,Canfield Donald E.¹

Affiliation:

1. Danish Center for Earth System Science and Institute of Biology, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark.

2. Department of Environmental Sciences, Clark Hall, University of Virginia, VA 22903, USA.

Abstract

The size of the marine sulfate reservoir has grown through Earth's history, reflecting the accumulation of oxygen into the atmosphere. Sulfur isotope fractionation experiments on marine and freshwater sulfate reducers, together with the isotope record, imply that oceanic Archean sulfate concentrations were <200 μM, which is less than one-hundredth of present marine sulfate levels and one-fifth of what was previously thought. Such low sulfate concentrations were maintained by volcanic outgassing of SO 2 gas, and severely suppressed sulfate reduction rates allowed for a carbon cycle dominated by methanogenesis.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference30 articles.

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4. Mechanism of the bacterial reduction of sulphate from isotope fractionation studies

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