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- W2012102044 abstract "Hydrothermal alteration of rhyolite porphyry wall rock along a vertical fissure in the Broken Hills Range, Nevada, has produced a zoned deposit of sericite-talc-chlorite. Chemical analyses of a series of specimens show a progressive enrichment in MgO and a corresponding impoverishment in , and across the alteration zone from the host rhyolite porphyry toward the fissure. The minerals in the host rhyolite have been selectively replaced; the feldspars and ferromagnesian minerals first and quartz last. The alteration is attributed to ascending MgO-bearing hydrothermal solutions. Alteration by MgO-bearing hydrothermal solutions first removed , and from feldspars and ferromagnesian minerals. Sericite was formed first. Later, was removed from sericite, and, with the introduction of and structural rearrangement, a talc-pyrophyllite mixture was formed. With continued introduction, considerable amounts of talc and pyrophyllite were replaced by chlorite. The nature of the changes in chemical composition indicates that chlorite should be the final equilibrium phase. The presence of mixtures of chlorite with talc and pyrophyllite indicate that this equilibrium phase was never attained." @default.
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- W2012102044 date "1957-03-01" @default.
- W2012102044 modified "2023-09-25" @default.
- W2012102044 title "Wall-Rock Alteration in the Broken Hills Range, Nevada" @default.
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- W2012102044 doi "https://doi.org/10.1086/626420" @default.
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