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- W2114631444 endingPage "855" @default.
- W2114631444 startingPage "833" @default.
- W2114631444 abstract "Phase relations involving hydrous melting, volatile and mineral solubility and supercritical fluid phenomena at high pressure for mineral--H~2~O systems are generally not completely constrained by experimental data or adequately treated in thermodynamic models. Here we examine geometric relations in pressure (*P*)-temperature (*T*)-composition (*X*) topologies of simple hydrous *A*--H~2~O binaries, thus avoiding some of the pitfalls associated with other approaches. The relations between mineral solubility surfaces, wet melting and critical L=V behavior are shown explicitly in a series of *PT*, *TX* and isopleth contoured *PT* projections. Our analysis highlights the significance of Clapeyron slopes of melt- and fluid-solubility isopleths for L+V coexistence, supercritical-fluid phenomena and the geometry of phase-equilibrium boundaries. The results are useful for understanding wet melting, magma degassing and fluid behavior in high-pressure metamorphic and subduction-zone environments. The diagrams illustrate the general pattern of mineral solubility in aqueous fluids and volatile solubility in silicate melts. We discuss the significance of the critical-curve geometry for phase relations and fluid/melt densities. We examine a continuum of phase relation topologies for *A*--H~2~O, and show that these can result from subtle but important differences in the compositional behavior of melt coexisting with H~2~O-rich fluid. The systems SiO~2~(quartz)--H~2~O and NaAlSi~3~O~8~(albite)--H~2~O are taken as examples for which there is experimental data available to calibrate a complete phase relation topology." @default.
- W2114631444 created "2016-06-24" @default.
- W2114631444 creator A5012370500 @default.
- W2114631444 creator A5024102957 @default.
- W2114631444 creator A5057210065 @default.
- W2114631444 date "2007-05-01" @default.
- W2114631444 modified "2023-10-17" @default.
- W2114631444 title "Mineral solubility and hydrous melting relations in the deep earth: Analysis of some binary A H2O system pressure-temperature-composition topologies" @default.
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