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• W2051257684 abstract "We use granular inclusions and phenocrysts in the Little Glass Mountain rhyolite flows to estimate temperature, pressure and the fugacities of O2, H2 and H2O. The compositions of magnetite-ilmenite are used to estimate temperature and oxygen fugacity. Fugacities of H2 and H2O are estimated from the compositions of associated biotite-sanidine-magnetite. PTotal depends on the compositions of magnetite -ferrosilite-silica. Lastly, hydrothermal experiments were conducted at the estimated T, P and fO2 to establish the beginning of melting of the most evolved of the inclusions in CO2-H2O fluids. The data suggest that the most evolved inclusions formed at ∼ 830°C, a total pressure of 5200 bars, fO2 of 10−13 and PH2O ∼ 1000 bars. Of these variables total pressure is most difficult to estimate accurately. The values of T, P etc., previously stated produce a maximum estimate of the depth of equilibration between host magma and the inclusions whereas, assuming PH2O = PTotal yields a minimum estimate. The physical conditions together with texture suggest a plutonic origin at a minimum depth of 3.4 km but no deeper than 15–18 km beneath the Medicine Lake Highland. The composition and mineralogy suggest that the rhyolite was derived from the dacite by crystal fractionation. The relation between dacite and associated basaltic or andesitic rocks is uncertain. The 87Sr86Sr ratios (essentially 0.7040 for both inclusions and lavas) do not require involvement of crustal rocks. A source in the uppermost mantle or lower lithosphere is considered most probable for the parental liquid which gave rise to the dacite." @default.
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• W2051257684 date "1981-09-01" @default.
• W2051257684 modified "2023-09-24" @default.
• W2051257684 title "Genesis of Recent silicic magmatism in the Medicine Lake Highland, California: evidence from cognate inclusions found at Little Glass Mountain" @default.
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• W2051257684 doi "https://doi.org/10.1016/0016-7037(81)90279-9" @default.
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