The content of Sb, Ge and refractory siderophile elements in metals of L-group chondrites

Mathematics – Logic

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Scientific paper

A study of the content of Ge, Sb and the refractory metals Os, Re, Ru and Pt in metallic fractions of L-group chondrites has revealed that: (1) Ge and Sb are concentrated in the Ni-rich component taenite, and the amount of Sb is higher in the metals of equilibrated chondrites; (2) the refractory metals Os and Ru are concentrated, with Ir, in the fine metallic fraction (<200 mesh) of all chondrites, independently of petrologic type; and (3) the content of Re and Pt increases with decreasing grain size of the metal in the unequilibrated chondrites, while in the equilibrated the intermediate fraction has the highest and the coarse the lowest amount of these elements. The high Os/Re ratio of the finest metallic component of the equilibrated chondrites is the result of diffusion of Re into the coarser metal at higher recrystallization temperatures, but may in part be a primary feature. The abundance of the refractory metals in L-group chondrites relative to C1 increases in the order Ir < Ru < Pt < Os < Re, with Re being enriched by a factor of 1-1.35. This trend has been observed also in H, LL and E chondrites and in the group IA irons. These elements, which condense as metals, may become fractionated with respect to each other as a result of lower-temperature oxidation reactions; but it is also possible that, because of different crystallochemical properties, the refractory metals condense as alloys where their ratios are not chondritic. Any process which may act preferentially upon one of these different alloys, would tend to fractionate the refractory metals.

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