総説
マントル中の強親鉄性元素にまつわる 3 つの謎
2012 年 41 巻 5 号 p. 203-210
詳細
2012 年 41 巻 5 号 p. 203-210
Three enigmas of highly siderophile elements (HSE) in Earth's mantle, manifested by recent advances in HSE geochemistry of mantle peridotites, are reviewed in this paper. They are (1) the apparent overabundance of the HSE in the Earth's mantle compared to metal-silicate equilibrium, (2) supra-chondritic Pd/Ir and Ru/Ir ratios in primitive upper mantle (PUM) estimates, and (3) contrasting HSE patterns between massif- and xenolithic-peridotites. More studies on both natural and experiment-based data are clearly required for resolving these problems.
