Browsing by Author "Walker D."
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Browsing by Author "Walker D."
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Jana D.; Walker D. (1999)The impact of various mixtures of CO2, H2O, H2, and CH4 upon Fe, Ni, Co, W. Ge, P, and Mo partitioning between silicate and metal alloy liquids was evaluated experimentally at 1400°C and 10 kb in graphite. The effects ...
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Walker D. (2000)The siderophile element problem in mantle geochemistry has not been solved by treating the mantle as the residue of core formation in a closed system. Conventional solutions to the problem involve the addition of new ...
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Lazar C.; Walker D.; Walker R.J. (2004)Technetium isotopes 97Tc, 98Tc and 99Tc decay to 97Mo, 98Ru and 99Ru, with half-lives of 2.6 My, 4.1 My, and 0.21 My respectively. If there were early solar system processes that resulted in significant fractionation of ...
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Wheeler K.T.; Walker D.; Fei Y.; Minarik W.G.; McDonough W.F. (2006)Measurable uranium (U) is found in metal sulfide liquids in equilibrium with molten silicate at conditions appropriate for a planetary magma ocean: 1-10 GPa, 1750-2100 °C, 0-28 wt% S, and fO2 2 log units below IW. However, ...
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Majewski E.; Walker D. (1998)Soret diffusion rise times were observed and resolved for Fe-Ni-S-P melts at 10 kbar in thermal gradients between 1300 and 1450°C. A steady-state separation of S-rich components to the hot end of the ~2 mm long liquid ...
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Jana D.; Walker D. (1997)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 ...
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Jana D.; Walker D. (1997)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 ...
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Jana D.; Walker D. (1997)Sulfur is a potential light element in the liquid outer core of the Earth. Its presence in segregating metal may have had an influence in distribution of metal-loving (siderophile) elements during early accretion and core ...
Now showing items 1-8 of 8