Massive sulfide deposits of copper, zinc, and iron and associated stringer deposits. Multicomponent equilibrium calculations of the reaction of seawater with tholeiitic basalt at 300 degrees C, followed by calculation of the effects of cooling the resultant solution to 25 degrees C and mixing it with seawater. The calculated mineralogy and zoning patterns resemble many natural ore assemblages observed in deposits of the kuroko-type, East Pacific Rise, West Shasta District. According to the calculations, silica should be abundant in the massive sulfide deposits.--Modified journal abstract.

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