Primary, Secondary, and Admixture Zonation of Copper-Nickel Ores during Fractional Crystallization of Sulfide Melts

摘要

Results of the study of massive ore bodies of magmaticrncopper-nickel deposits demonstrate their heterogeneous structure by mineral assemblages in various parts of the ore body, as well as by average chemical composition. Moreover, these characteristics may change spasmodically within the ore body. Consequently a definite sequence of zones with various ore types is formed in it [1-3]. Such sequences are not necessarily the same in different deposits, but accumulated results provide evidence for some similarity of the deposit structure and allow us to classify them by zonation types.