High pressure, near-liquidus phase equilibria of the Home Plate basalt Fastball and melting in the Martian mantle

Details High pressure, near-liquidus phase equilibria of the Home Plate basalt Fastball and melting in the Martian mantle High pressure, near-liquidus phase equilibria of the Home Plate basalt Fastball and melting in the Martian mantle

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3713201f&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 13, CiteID L13201

Physics

5

Planetary Sciences: Solar System Objects: Mars, Mineralogy And Petrology: Geochemical Modeling (1009, 8410), Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineralogy And Petrology: Magma Genesis And Partial Melting (1037), Mineralogy And Petrology: Planetary Mineralogy And Petrology (5410)

Scientific paper

Near-liquidus phase equilibria experiments have been conducted on a synthetic Fastball basalt composition, as analyzed at Home Plate plateau of Mars (Gusev Crater), to test if it represents a primitive mantle derived melt and place constraints on the temperature of the ancient mantle and on the lithosphere-asthenosphere boundary of Mars. The Fastball basalt is multiply saturated with olivine and orthopyroxene at ˜1.2 GPa and 1430°C. Based on melting models, we predict that the Fastball composition could be produced by 13-23% equilibrium melting of the Martian mantle, with extraction of melt from the base of ˜105 km thick lithosphere. The multiple saturation for Fastball also constrains the potential temperature of the Martian mantle to be approximately 1480-1530°C with an initial melting pressure of 4.0-4.7 GPa. This potential temperature is much lower than that of the terrestrial mantle derived from similarly ancient magmas, i.e., komatiites.

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