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Economic Geology; December 1964; v. 59; no. 8; p. 1588-1595
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The possible role of oxygen in the anomalous pyrite-pyrrhotite relation

Charles A. Salotti

Common occurrence of pyrite before pyrrhotite in deep-seated sulfide deposits is attributed to decrease from initially high oxygen content of ore-forming fluid rather than to decrease in availability of sulfur or increase in temperature. The high content of oxygen, early in sequence and presumably associated with high content of CO 2 , is indicated by common presence of sulfate (barite) in gangue. Late pyrite, following pyrrhotite is consequence of increased sulfur activity.

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