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- W2247853811 abstract "Detailed mineralogical, paragenetic, and geochemical studies in the southern Ohio vein at Creede, Colorado, a Tertiary volcanic hosted Pb-Zn-Ag epithermal deposit, indicate that two hypogene vein fluids with distinct redox characteristics alternately precipitated oxidized and reduced assemblages. Oxidized assemblages are characterized by barite and hematite, whereas the reduced fluids appear responsible for the base and precious metal, as well as gangue deposition. The oxidizing fluid was generated either through shallow level boiling or volatile exsolution (CO/sub 2/, H/sub 2/S) of an initially reduced primary hydrothermal fluid or through mixing with an oxidized groundwater. Hypogene events in the wallrock, contemporaneous with vein mineralization, have the following paragenesis: 1) pervasive bleaching of the wallrock via pyritization of groundmass hematite with introduction of reduced hydrothermal vein fluids, 2) argillization (illite with 3-15 +/- 2% interlayered smectite) of the wallrock and disseminated sulfide mineralization, and 3) vein related silicification overprinting earlier events. These reactions result from the introduction of low pH (approx. 5.0), sulfur poor (10/sup -3/ - 10/sup -3.5/ m), reduced (H/sub 2/S) hydrothermal fluids into the wallrock. Mineralization occurred over a decreasing temperature regime (approx. 250 to 180/sup 0/C) possibly coupled with a pH increase related to argillization. The nature and distributionmore » of wallrock alteration is controlled by permeability, fluid composition, and temperature.« less" @default.
- W2247853811 created "2016-06-24" @default.
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- W2247853811 date "1985-01-01" @default.
- W2247853811 modified "2023-09-26" @default.
- W2247853811 title "Geochemical environment of mineralization and alteration in the southern Ohio vein, Creede, Colorado" @default.
- W2247853811 hasPublicationYear "1985" @default.
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