Metal-Sulfide Melt Non-Interconnectivity in Silicates, Even at High Pressure, High Temperature, and High Melt Fractions

Details Metal-Sulfide Melt Non-Interconnectivity in Silicates, Even at High Pressure, High Temperature, and High Melt Fractions Metal-Sulfide Melt Non-Interconnectivity in Silicates, Even at High Pressure, High Temperature, and High Melt Fractions

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..881m&link_type=abstract

Lunar and Planetary Science, volume 27, page 881

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Cores: Formation, Interfacial Angle, Silicate Melt, Sulfide Melt

Scientific paper

We have investigated the textural microstructure of iron-nickel-sulfur melts in contact with olivine, pyroxene, and the modified-spinel polymorph of olivine. The experiments were conducted at 1500 degrees C and pressures ranging from 1 to 17 GPa. For compositions more metal-rich than the monosulfide, including the eutectic composition, the metal sulfide melt has a dihedral angle greater than 60 degrees and does not form an interconnected grain-edge fluid. Increasing pressure does not measurably alter the dihedral angles. Textural evolution results in coarsening of the sulfide melt pockets, resulting in large pockets surrounded by many silicate grains and separated from one another by melt-free grain edges. Chemical communication between these large pockets is limited to lattice and grain-boundary diffusion. Due to the large interfacial energy between sulfide melt and silicates, sulfide melts are unable to separate from solid silicate via grain-boundary percolation and remain stranded in isolated melt pockets. Sulfide melt in excess of the critical melt fraction (5-25%) will develop a transient interconnectivity as sulfide collects into larger melt pockets and interconnectivity is pinched off. Efficient separation of core-forming sulfide melts from silicate requires either melting of the silicate matrix or a very large fraction of metal-sulfide melt (perhaps as large as 40%).

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