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Interstitial sea water in buried arkosic sediments at temperatures as low as 200° C may derive more than a part per million lead from K-feldspar as the solution phase equilibrates with its environment. The amounts of pore solution, source rock, and time required to derive and transport sufficient quantities of lead for subsequent deposition of major ore deposits of galena are geologically realistic. Calculations for lead derived from metamorphism of arkosic sediments provide an insight into the general requirements for "source bed" genesis of hydothermal ore-forming solutions.

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