Ru, Re, Os, Pt and AU in iron meteorites

Computer Science

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Iron Meteorites, Magma, Meteoritic Composition, Neutron Activation Analysis, Noble Metals, Volatility, Gold Alloys, Osmium Compounds, Platinum Compounds, Rhenium Compounds, Ruthenium Compounds, Meteorites, Iron Meteorites, Composition, Chemistry, Ruthenium, Rhenium, Osmium, Platinum, Gold, Refractory Material, Siderophiles, Iiif Irons, Samples, Meteorite, Neutron Activation Analysis, Iid Irons, Magmatism, Formation, Origin, Iiicd Irons, Iab Irons, Nickel, Laboratory Studies, Iiab Irons, Iiiab Irons, Compari

Scientific paper

Neutron activation analysis is used to ascertain the proportions of Ru, Re, Os, and Pt refractory siderophiles, and moderately volatile Au, in 41 iron meteorites. The Ni-element trends defined for groups IID and IIIF support a magmatic origin; in addition, the results obtained for groups IAB and IIICD contrast with trends observed in magmatic groups, where the Ru and Pt slopes are substantially less steep. In group IIIAB, at Ni concentrations above 90 mg/g, the steep decrease of Re, Os, and Ir with Ni levels off, and the interelement ratios exhibit considerable scatter. These observations may be explained in terms of the contamination of the residual molten core with small amounts of late primitive melts draining from the mantle.

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