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• W1994240717 endingPage "1093" @default.
• W1994240717 startingPage "1074" @default.
• W1994240717 abstract "The mineral-fluid equilibria that govern silica redistribution by aqueous fluids in subduction zones were evaluated at constant pressure and temperature in the model system MgO-SiO2-H2O (MSH). At <20 kbar and <1000° C, model H2O-SiO2 fluids liberated via devolatilization in subducting crust will be buffered at or near quartz saturation along any specified subduction P-T path, whereas fluids in equilibrium with model metaperidotites, ranging from dunite to orthopyroxenite protoliths, have silica concentrations significantly below quartz saturation. Isothermalisobaric flow of fluid from the slab to the mantle wedge therefore drives metasomatic reactions that increase the bulk silica content of metaperidotites and decrease the silica content of the fluid. The potential for silica metasomatism increases with depth for all subduction paths and model bulk compositions. At a given depth, the capacity for silica metasomatism increases with temperature and with abundance of forsterite relative to enstatite. Water-rock ratios required to produce metasomatic mineral assemblages decrease with increasing pressure and temperature. Mineral assemblages diagnostic of silica metasomatism at shallow subduction levels require water-rock ratios of >100 moles fluid/cm3 rock; but at depth, flow of only several moles fluid/cm3 rock is sufficient to produce assemblages characteristic of silica metasomatism. Decreasing temperature with time in most subduction zones suggests that the potential for silica metasomatism is greatest at early stages of convergence. Subducted ultramafic rocks showing evidence of high-temperature silica metasomatism therefore may provide windows into early subduction processes. In general, temporal changes in subduction parameters favoring increasing temperatures will enhance the potential for silica metasomatism, whereas those leading to lower temperatures should be expected to decrease the capacity for silica transfer with time." @default.
• W1994240717 created "2016-06-24" @default.
• W1994240717 creator A5048828311 @default.
• W1994240717 date "1995-12-01" @default.
• W1994240717 modified "2023-09-30" @default.
• W1994240717 title "Phase-Equilibrium Controls on SiO₂Metasomatism by Aqueous Fluid in Subduction Zones: Reaction at Constant Pressure and Temperature" @default.
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• W1994240717 doi "https://doi.org/10.1080/00206819509465440" @default.
• W1994240717 hasPublicationYear "1995" @default.
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