Tomkins, Andrew; Weinberg, R; McFarlane, Christopher
We compare melting of potassic alteration zones in metamorphosed gold deposits with that of unaltered rocks of the same protolith to examine their relative contributions to crust-derived magmas and to investigate the implications for ore genesis. Potassic hydrothermal alteration, at the crustal levels where orogenic gold deposits form, stabilizes a higher proportion of muscovite and biotite than is possible in unaltered rocks at high metamorphic grades. Because these micas contain water, they...[Show more]
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