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- W1968554206 abstract "Fourteen spinel lherzolites, for which extensive trace element data are available, may be divided into three groups depending upon the percentage loss of basaltic partial melt; averages are slightly depleted, −7% melt (Ca/Sa > 0.09); moderately depleted, −13% (0.09 > Ca/Si > 0.06); and strongly depleted, −20% (0.06 > Ca/Si). Rhenium abundances of the groups are correlated with percent depletion, and the intercept of 0.0071 × Cl chondrite corresponding to undepleted mantle is identical to that independently derived from 187 Os/ 186 Os in osmiridium of known age. The distribution of Re in mafic and ultramafic rocks is apparently closely related to S and Se abundances. Lherzolite data suggest that the abundances of highly siderophile elements (Os, Re, Ir, Pd, Au) and chalcogenic elements (S, Se, Te) in a primary basaltic melt are significantly higher than those of average oceanic ridge basalts but may be similar to those of trace element‐rich Indian Ocean ridge basalts. The estimated S content (∼1000 ppm) of a primary basaltic melt is compatible with experimentally measured S solubilities at high temperature and pressure. On the basis of lherzolite depletion and using published trace element data for spinel lherzolites and ocean ridge basalts, estimated abundances in ppb (or × 10 3 /Cl chondrite abundances) in pristine upper mantle are Os, 3.1 (5.9); Re, 0.26 (7.1); Ir, 3.4 (7.1); Pd, 4.5 (8.1); Au, 1.01 (8.4); S, 200,000 (3.2); Se, 57 (3.1). The trace element pattern closely resembles that of the CM2 chondrites, but not of the CO3, CV3 or H chondrites. The pattern is a reasonable match, except for Au, with Apollo 17 lunar breccias that contain a “group 2” ancient meteoritic component, suggesting that rather similar objects bombarded earth and moon during the first 600 m.y. of their history." @default.
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- W1968554206 date "1986-11-10" @default.
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- W1968554206 title "Ultramafic xenoliths: Clues to Earth's late accretionary history" @default.
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- W1968554206 doi "https://doi.org/10.1029/jb091ib12p12375" @default.
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