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A simple, obvious mechanism for the deposition of the Mississippi Valley-type sulfide ores is proposed. Rising hot brines, carrying heavy metals in solution as chloride complexes, cause the thermal degradation of the sulfur-containing organic compounds found in all organic matter, and particularly in petroliferous materials. The thermal degradation slowly releases sulfur, probably as H2S, which causes the Mississippi Valley-type sulfide ores to be precipitated.

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