Mineral solubility and hydrous melting relations in the deep earth: Analysis of some binary A H2O system pressure-temperature-composition topologies

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ID: 299934
2007
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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.
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openalex_W2114631444 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors A. C. Hack, Jörg Hermann, John Mavrogenes
Journal american journal of science
Year 2007
DOI
10.2475/05.2007.03
URL
https://ajs.scholasticahq.com/article/61643.pdf
Keywords Keywords not found

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