Литосфера (Feb 2015)
Trace element composition of troilite, iron and iron-nickel metall from meteorite Chelyabinsk
Abstract
We studied the contents of trace elements in troilite, iron and in iron-nickel metal from meteorite Chelyabinsk by means of LA-ICP-MS. The features of the distribution of siderophile and chalcophile elements in sulfide and metallic phase in gray and black (impact modified) meteorite fragments were identified and the correlations in the content of these elements was analyzed. The correlation of PGE and Au versus Ni was determined, which is probably related to their joint fractionation between sulfide and metallic phase during high-temperature recrystallization in gray meteorite fragments. In contrast, in black meteorite fragments the contents of these elements are flattened in metal and troilite. Distribution of siderophile elements in metal of meteorite Chelyabinsk black fragments essentially differs from the same in chondrites ALHA78109 (LL5) and Soko-Banja (LL4). For the gray fragments there are no such differences, this apparently indicates to the redistribution of some siderophile elements between metal and sulfide phase of meteorite as a result of melting under impact events.
