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NASA Technical Reports Server (NTRS) 20140011744: Metal-Silicate Pa... |
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by NASA Technical Reports Server (NTRS) |
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Geochemical models of core formation are commonly based |
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on core and mantle abundances of siderophile elements |
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that partitioned between silicate and metal in a magma |
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ocean in the early Earth. Tungsten is a moderately |
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siderophile element that may provide constraints on the |
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pressure, temperature, composition, and oxygen fugacity |
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conditions, and on the timing of core formation in the |
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Earth. Previous experimental studies suggest that |
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pressure exerts little to no influence over W metal- |
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silicate partitioning up to 24 GPa, and indicate that the |
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stronger influences are temperature, composition, and |
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oxygen fugacity. However, core formation models based in |
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part on W, predict metal-silicate equilibration pressures |
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outside the available experimental pressure range, |
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requiring extrapolation of parameterized models. |
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Therefore, higher pressure experimental data on W were |
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needed to constrain this important parameter. |
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Date Published: 2016-11-16 13:57:07 |
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Identifier: NASA_NTRS_Archive_20140011744 |
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Item Size: 4166210 |
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Language: english |
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Media Type: texts |
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