THE IMPACT OF CARBON ON ELEMENT DISTRIBUTION DURING CORE FORMATION
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dc.contributor.author | Jana D. | |
dc.contributor.author | Walker D. | |
dc.date.accessioned | 2020-12-15T05:04:20Z | |
dc.date.available | 2020-12-15T05:04:20Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=273679 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1997, , 13, 2759-2763 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20852 | |
dc.description.abstract | The distribution of Fe, Ni, Co, P, Ge, W, Mo, and O between molten silicate and liquid metal was determined at pressures and temperatures relevant to core formation (50-80 kb, 2000-2300°C) under both carbon-free and graphite-saturated conditions. The effect of carbon is very pronounced in reducing the siderophile tendencies of P and Ge. Germanium showed a significant reduction in metal-silicate partition coefficients (Dmet/sil) from a value too high to be determined by the electron microprobe in the carbon-free metal/ultrabasic silicate system down to a value of # 33 in the carbon-bearing metal/ultrabasic silicate system. Phosphorus becomes lithophile at carbon saturation. Nickel and cobalt show a modest reduction, and W and Mo show a modest increase in siderophility at graphite saturation. These effects are seen both in basic, aluminous, and ultrabasic, magnesian silicate liquids. Carbon-bearing liquids, in combination with their sulfurous cousins, would be less effective at depleting silicate liquids in many siderophile elements than C- and S-free liquids. Limits upon any geochemical role for carbon in the core forming process, however, are provided by P which becomes lithophile at carbon saturation. As P is depleted rather than enriched in the mantle, core formation probably did not occur at carbon saturation. | |
dc.title | THE IMPACT OF CARBON ON ELEMENT DISTRIBUTION DURING CORE FORMATION | |
dc.type | Статья |
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