INCLUSIONS OF NATIVE METALS AND OTHER MIN ERALS IN DIAMOND FROM KIMBERLITE PIPE-50, LIAONING, CHINA

Inclusions in diamond from kimberlite Pipe 50, Liaoning Province, Chin a, were detected using a complex of methods of analytical electron mic roscopy. A close examination of these inclusions revealed the followin g sequence in the crystallization of their phases. Syngenetic inclusio ns of native metals (alpha-Fe, native Cr, and a metallic Cr-Fe-Ni phas e), sulfides, and, possibly, apatite, graphite, and droplets of magnet ite compose the oldest assemblage, which provides information on the h igh-temperature and high-pressure environment, Florencite and Ce-fluor ite affiliate with a younger assemblage of epigenetic minerals. The fl aky magnetite and wuestite formed by the postcrystallization oxidation of the native iron.