THE INFLUENCE OF SILICATE MELT COMPOSITION ON DISTRIBUTION OF SIDEROPHILE ELEMENTS AMONG METAL AND SILICATE LIQUIDS
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dc.contributor.author | Jana D. | |
dc.contributor.author | Walker D. | |
dc.date.accessioned | 2020-12-15T03:40:33Z | |
dc.date.available | 2020-12-15T03:40:33Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=267820 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1997, , 3, 463-472 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20792 | |
dc.description.abstract | Liquid metal-liquid silicate partitioning of Fe, Ni, Co, P, Ge, W and Mo among a carbon-saturated metal and a variety of silicate melts (magnesian-tholeiitic-siliceous-aluminous-aluminosiliceous basalts) depends modestly to strongly upon silicate melt structure and composition. Low valency siderophile elements, Fe, Ni and Co, show a modest influence of silicate melt composition on partitioning. Germanium shows a moderate but consistent preference for the depolymerized magnesian melt. High valency siderophile elements, P, Mo, and W, show more than an order of magnitude decrease in metal-silicate partition coefficients as the silicate melt becomes more depolymerized. Detailed inspection of our and other published W data shows that polymerization state, temperature and pressure are more important controls on W partitioning than oxidation state. For this to be true for a high and variable valence element implies a secondary role in general for oxidation state, even though some role must be present. Equilibrium core segregation through a magma ocean of 'ultrabasic' composition can provide a resolution to the 'excess' abundances of Ge, P, W and Mo in the mantle, but the mantle composition alone cannot explain the excess abundances of nickel and cobalt in chondritic proportions. | |
dc.subject | CARBON | |
dc.subject | SIDEROPHILE ELEMENTS | |
dc.subject | PARTITIONING | |
dc.subject | CORE | |
dc.title | THE INFLUENCE OF SILICATE MELT COMPOSITION ON DISTRIBUTION OF SIDEROPHILE ELEMENTS AMONG METAL AND SILICATE LIQUIDS | |
dc.type | Статья |
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