Chromite deposits in the ophiolite complex of Northern Oman |
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Authors: | Tj. Peters J. D. Kramers |
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Affiliation: | 1. Min.-petr. Inst. University Bern, Switzerland 2. Bernhard Price Inst. of Geophysical Research, University of Witwatersrand, Johannesburg
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Abstract: | In the ophiolite series of N. Oman numerous small and large elongated podiform chromite deposits occur within the peridotite complex at a certain level of 100–200 meters below the layered zone, which grades into the overlying gabbro complex. The chromite grains were corroded after their deposition; their composition shows a large variation in Cr/Al ratio and a small variation in Cr/Fe ratio. The chromium is thought to have been liberated from clino-pyroxenes during partial melting of lherzolitic upper mantle material. Precipitation of large quantities of chromite at the specific level below the gabbro complex is related to the plagioclase- /spinel-lherzolite transition, but the influence of a change in oxygen fugacity is also considered. |
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