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- W2041532412 abstract "On the basis of a systematic thermodynamic evaluation of some 250 gas analyses for 100 to 800°C fumaroles on White Island, New Zealand, the gas discharges were found to be made up of two source components: (1) a primary “magmatic” component high in SO2, rising rapidly and directly from the underlying magma; and (2) a secondary “hydrothermal” component rising slowly from a two-phase, saline brine-vapor envelope surrounding the magmatic system. Relative rates of equilibration for individual species decrease from H2, to CO, to CH4 and NH3. The two “slow” species, CH4 and NH3, are formed at depth within the hydrothermal zones where redox conditions are governed by the Fe(II)-Fe(III) buffer of the rock system; redox conditions within the rapidly rising magmatic component are governed by the SO2-H2S buffer, but only the “fast” system H2-H2O is able to repond. Both systems are bridged by CO-CO2. The overall redox process corresponds to the more or less succesful conversion of initially oxidised (SO2, CO2), high temperature magmatic gases to their reduced counterparts (H2S, CH4), which are stable in the presence of lower temperature rock. The highly acid and oxidising conditions within the hydrothermal zones give rise to intensive fluid-rock interaction, the dissolution of cationic rock components, and the formation of highly mineralised brines, that are potential source fluids for volcanic-hosted precious metal deposits." @default.
- W2041532412 created "2016-06-24" @default.
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- W2041532412 date "1987-03-01" @default.
- W2041532412 modified "2023-10-04" @default.
- W2041532412 title "Redox processes governing the chemistry of fumarolic gas discharges from White Island, New Zealand" @default.
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- W2041532412 doi "https://doi.org/10.1016/0883-2927(87)90030-8" @default.
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