Calibration of Sulfate Levels in the Archean Ocean

Details Calibration of Sulfate Levels in the Archean Ocean Calibration of Sulfate Levels in the Archean Ocean

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sci...298.2372h&link_type=abstract

Science, Volume 298, Issue 5602, pp. 2372-2374 (2002).

Physics

63

Scientific paper

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 SO2 gas, and severely suppressed sulfate reduction rates allowed for a carbon cycle dominated by methanogenesis.

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