The role of oxidation-reduction and C-H-O fluids in determining melting conditions and magma compositions in the upper mantle

Mathematics – Logic

Scientific paper

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Earth Mantle, Geophysical Fluids, Magma, Oxidation-Reduction Reactions, Petrology, Amphiboles, Carbon, Chemical Composition, Peridotite, Water

Scientific paper

The nature of interactions between the oxidized and reduced C-H-O fluilds and the upper-mantle mineralogy is invesitgated using the results of a high-pressure and high-temperature experiment in which the melting behavior of several peridotite systems was investigated. The following systems were considered: (1) peridotite melting (the C,H-free solidus); (2) peridotite-CH4-H2O (the 'reduced' solidus); (3) peridotite-H2O (the water-maximum solidus); and (4) peridotite-H2O-CO2 (the 'oxidized' solidus). It was found that melting in the periodite-(C-H-O) system is very sensitive to oxygen fugacity. The periodite-(C-H-O) melting relations are complex and offer reasonable petrological constraints to asthenosphere/lithosphere models and to models of petrogenesis of magmas.

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