Low marine sulphate and protracted oxygenation of the Proterozoic biosphere

Linda C. Kah (), Timothy W. Lyons and Tracy D. Frank
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Linda C. Kah: University of Tennessee
Timothy W. Lyons: University of Missouri
Tracy D. Frank: University of Nebraska

Nature, 2004, vol. 431, issue 7010, 834-838

Abstract: Abstract Progressive oxygenation of the Earth's early biosphere is thought to have resulted in increased sulphide oxidation during continental weathering, leading to a corresponding increase in marine sulphate concentration1. Accurate reconstruction of marine sulphate reservoir size is therefore important for interpreting the oxygenation history of early Earth environments. Few data, however, specifically constrain how sulphate concentrations may have changed during the Proterozoic era (2.5–0.54 Gyr ago). Prior to 2.2 Gyr ago, when oxygen began to accumulate in the Earth's atmosphere2,3, sulphate concentrations are inferred to have been

Date: 2004
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DOI: 10.1038/nature02974

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