Science. 2004 Apr 2;304(5667):87-90. Epub 2004 Mar 4.

Molybdenum isotope evidence for widespread anoxia in mid-Proterozoic oceans.

Arnold GL, Anbar AD, Barling J, Lyons TW.

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Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA. gail@earth.rochester.edu

Abstract

How much dissolved oxygen was present in the mid-Proterozoic oceans between 1.8 and 1.0 billion years ago is debated vigorously. One model argues for oxygenation of the oceans soon after the initial rise of atmospheric oxygen approximately 2.3 billion years ago. Recent evidence for H(2)S in some mid-Proterozoic marine basins suggests, however, that the deep ocean remained anoxic until much later. New molybdenum isotope data from modern and ancient sediments indicate expanded anoxia during the mid-Proterozoic compared to the present-day ocean. Consequently, oxygenation of the deep oceans may have lagged that of the atmosphere by over a billion years.

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Science. 2005 Aug 12;309(5737):1017; author reply 1017.

PMID:: 15066776; [PubMed]

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Molybdenum isotope evidence for widespread anoxia in mid-Proterozoic oceans.

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