Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.347..174r&link_type=abstract
Nature (ISSN 0028-0836), vol. 347, Sept. 13, 1990, p. 174-176.
Physics
17
Abundance, Chromium, Geochemistry, High Pressure, Lunar Evolution, Vanadium, Chondrites, Earth Mantle, Iron Alloys, Lunar Mantle, Manganese
Scientific paper
Experimental studies of the partitioning of Cr, V, and Mn between molten iron and silicates show that these elements are lithophile at the pressures, temperatures, and oxygen fugacities prevailing in the earth's upper mantle and in the moon. Here, it is shown that at much higher pressures, corresponding to those in the earth's lower mantle, the partitioning behavior of Cr, V, and Mn changes owing to increasing solubility of oxygen in molten iron. Cr and V, and perhaps Mn, are preferentially partitioned into molten iron under these conditions. The depletion of these elements in the earth's mantle is therefore attributed to their siderophile behavior during formation of the earth's core, at pressures that were sufficiently high to cause substantial amounts of oxygen to dissolve in molten metallic iron. Similar depletion patterns of Cr, V, and Mn in the earth's mantle and the moon strongly suggest that a large proportion of the moon was derived from the earth's mantle after the earth's core had segregated.
Hibberson W.
Kato Taichi
Ringwood A. E.
Ware N.
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