Oxygen potential and PGE geochemistry of alkaline-ultramafic complexes |
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| Authors: | I D Ryabchikov L N Kogarko |
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| Institution: | 1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 199017, Russia
2. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119975, Russia
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| Abstract: | At the oxygen fugacity characteristic of meimechite and olivine-bearing rocks of the Maimecha-Kotui province, sulfides are unstable at the magmatic stage, and metallic alloys are the main mode of PGE occurrence in these magmas. The estimated PGE contents in olivine aggregates of meimechite are close to the average PGE composition of dunite in the Guli massif. The nano-sized inclusions of metallic alloy are the most probable mode of PGE occurrence in meimechite. The formation of sufficiently large metallic PGE grains may be a result of mixing of partly fractionated melt with a new portion of primitive magma, as was suggested during interpretation of chromite lodes. |
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