ISOTOPE ANOMALIES OF XE AND KR IN THE INC LUSIONS IN SIKHOTE-ALIN IRON METEORITE

Isotope composition and concentrations of Xe, and Kr have been determi ned in troilite, schreibersite, and rhabdite of Sikhote-Alin' iron met eorite. Anomalous isotope composition of Xe has been found in these mi neral inclusions: the heavy-isotope component enriched in Xe-132, Xe-1 31, Xe-136, and Xe-134. The following isotope ratios have been obtaine d: Xe-132/Xe-130 7.92, Xe-131/Xe-130 7.96, Xe-134/Xe-130 3.00, and Xe- 136/Xe-130 2.78. We detect also the primary planetary Xe. Usual proces ses of isotope mass fractionation could not produce such the component s. Cosmogenic isotopes of Xe, and Kr have been also found in the inclu sions studied. Correlation has been found between the isotopes Xe-132, Xe-131, Xe-129, Kr-82, and Kr-83. Migration of volatiles (I, Te, Br, Se) at the early stages of evolution of these inclusions explains thes e correlations.