Partitioning of Tungsten and Molybdenum Between Metallic Liquid and Silicate Melt
- 17 November 1995
- journal article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 270 (5239), 1186-1189
- https://doi.org/10.1126/science.270.5239.1186
Abstract
The “excess” of siderophile elements in Earth's mantle is a long-standing problem in understanding the evolution of Earth. Determination of the partitioning behavior of tungsten and molybdenum between liquid metal and silicate melt at high pressure and temperature shows that partition coefficients (Dmetal/silicate) vary by two orders of magnitude depending on whether metal segregated from a basaltic or peridotitic melt. This compositional dependence is likely a response to changes in the degree of polymerization of the silicate melt caused by compositional variations of the network-modifying cations Mg2+and Fe2+. Silicate melt compositional effects on partition coefficients for siderophile elements are potentially more important than the effects of high pressure and temperature.Keywords
This publication has 11 references indexed in Scilit:
- The influence of pressure and temperature on the metal-silicate partition coefficients of nickel and cobalt in a model C1 chondrite and implications for metal segregation in a deep magma oceanGeochimica et Cosmochimica Acta, 1995
- High-Pressure and High-Temperature Experiments on Core-Mantle Segregation in the Accreting EarthScience, 1994
- Superheating Effects on Metal-Silicate Partitioning of Siderophile ElementsScience, 1993
- Pressure-induced coordination changes of transition-metal ions in silicate meltsNature, 1993
- Early Differentiation of the Earth and the Problem of Mantle Siderophile Elements: A New ApproachScience, 1991
- V, Cr, and Mn in the Earth, Moon, EPB, and SPB and the origin of the Moon: Experimental studiesGeochimica et Cosmochimica Acta, 1989
- Abundances of the elements: Meteoritic and solarGeochimica et Cosmochimica Acta, 1989
- Experimental determination of metal/silicate partition coefficients for P, Co, Ni, Cu, Ga, Ge, Mo, and W and some implications for the early evolution of the EarthGeochimica et Cosmochimica Acta, 1989
- Geochemical constraints on core formation in the EarthNature, 1986
- Occurrence of Giant Impacts During the Growth of the Terrestrial PlanetsScience, 1985