Ore and geochemical specialization of Permo-Triassic ultramafic-mafic complexes in North Vietnam

The Permo-Triassic ultramafic-mafic complexes in North Vietnam were mineral ogically and geochemically specialized in the epoch of wide development of mantle magmatism on the territory of Central and Southeastern Asia. This pa per describes sulfide Cu-Ni deposits related to high-Mg volcanoplutonic com plex of komatiite-basalt composition (P-2-T-1) of the Song Da taphrogenic s tructure and low-sulfide Pt-Cu-Ni ore occurrences in the layered peridotite -gabbro massifs of the Nui Chua complex (T-3-J(1)). Emphasis is placed on g eochemistry and mineralogy of platinum group elements (PGE) in deposits of these types. The fact that the sulfide Cu-Ni ores of the Ta Hoa region cont ain, along with PGE minerals, comp;ex sulfosalts, native copper, gold, and silver permits these deposits to be considered as complex ones. Peculiar co mposition and pattern of distribution of Cu, Ni, and PGE minerals in the la yered series of rocks from the Nui Chua massif suggest higher concentration s of these minerals in lower horizons of this and other layered peridotite- gabbro massifs in North Vietnam. This territory is considered to be Cu-, Ni -, and PGE-promising metallogenic province.