The investigation of genetic relationship between the Baszkowka and Mt. Tazerzait chondrites by NAA and other methods

The similarity of two meteorites, Baszkowka (Poland, 1994) and Mt. Tazerzai t (Niger, 1991), was studied by instrumental and radiochemical neutron acti vation analysis supplemented by mercury determination with the aid of an au tomatic mercury analyzer yielding data for 23 elements. The bulk compositio n of both meteorites is nearly identical within the experimental error. The ir composition is also similar to the mean composition of L chondrites but there are marked deviations in the cases of Pd, Os, Pt, Cu and Hg. It seems also that both meteorities are slightly enriched in light rare earth eleme nts (REE) and slightly depleted in heavy REE in comparison with L chondrite s. This study supports earlier suggestions based on petrological properties , abundance of noble gases and their isotopic composition, gas retention ag es and cosmic ray exposure ages, that these two chondrites have the same or igin and the common parent body. It cannot be excluded that this parent bod y is different from that typical for all other known L chondrites.