Technical Comments

Response to Comment on "Early Archaean Microorganisms Preferred Elemental Sulfur, Not Sulfate"

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Science  07 Mar 2008:
Vol. 319, Issue 5868, pp. 1336
DOI: 10.1126/science.1151414

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Our knowledge of the sulfur cycle on early Earth is still in its infancy. Nevertheless, there exist enough geochemical constraints from the rock record to show that the theoretical mixing models proposed by Bao et al. are highly unlikely to account for the range of δ34S and Δ33S values recorded for the microscopic sulfides at the North Pole.

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