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• W2017495845 endingPage "73" @default.
• W2017495845 startingPage "57" @default.
• W2017495845 abstract "Forty samples of harzburgites and dunites from the Maqsad oceanic mantle diapir, southern Oman, have been investigated for the Cu-Fe-Ni sulfide component and analyzed for sulfur. The residual harzburgites contain less than 180 ppm of S. The sulfide component is considered to be residual and to have survived the partial melting event giving rise to S-saturated MORB-type magma. The primary sulfide assemblage is closely associated with orthopyroxene, dominated by pentlandite and chalcopyrite and very poor in pyrrhotite; it has been partly altered into secondary sulfides and native metals (awaruite and native copper) by serpentinization-related reducing fluids. Residual peridotites infiltrated by silicate melts subsequent to plastic deformation are strongly enriched in sulfur, this applying especially to the dunites, which contain up to 570 ppm S. In this case, the sulfide component has a metasomatic origin, as demonstrated by its close association with the impregnation silicates (clinopyroxene and, to a lesser degree, plagioclase) and with Cr spinel re-equilibrated with the percolating silicate melts. Moreover, the sulfide assemblage of the impregnated rocks differs from that of the harzburgites by virtue of a high CuNi bulk ratio. The primary sulfide assemblage included in Cr spinel has resisted low-temperature alteration and is composed of pentlandite, chalcopyrite, bornite and very small amounts of pyrrhotite. The metasomatic sulfide component of impregnated rocks is ascribed to S-saturated silicate melts coming from deeper parts of the mantle and trapped at the top of the mantle diapir. Nevertheless, sulfide precipitation differs from a simple gravity-settling model and seems to be dependent on the precipitation of Fe-Mg non-sulfide minerals, probably because the latter were capable of modifying the Fe activity of the silicate melt, which controls the S solubility." @default.
• W2017495845 created "2016-06-24" @default.
• W2017495845 creator A5087050250 @default.
• W2017495845 date "1988-09-01" @default.
• W2017495845 modified "2023-10-12" @default.
• W2017495845 title "FeNiCu sulfides in tectonite peridotites from the Maqsad district, Sumail ophiolite, southern Oman: Implications for the origin of the sulfide component in the oceanic upper mantle" @default.
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• W2017495845 doi "https://doi.org/10.1016/0040-1951(88)90240-5" @default.
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