The Tectonic Settings And Metallogenic Characteristics Of Eastern Tianshan Mountains In Late Paleozoic Era

Eastern Tianshan Mountain lies between Kazakhstan-Zhungar plate, Tarim plate and Xiboliya plate, its geologic structure is extremely complex, and mineralization condition is advantageous. On basis of some predecessors'correlative study, the tectonic settings and metallogenic characteristics are analyzed in the area during carboniferous in this article,by studying the characteristics of stratum and the chemical composition of magma. The main conclusions are as follows:(1) The analysis of stratum's characteristics indicated that: Lower Carboniferous as a semi-deep to deep-sea clastic sedimentation, Upper Carboniferous clastic for the deposition of a shallow sea to the continental margin, indicating that the sedimentary environment from the trench to the island arc;(2) Carboniferous section is the most intensive period of plate activity in this area, in early Carboniferous the oceanic plate respectively started diving to Tarim block and the Tianshan block , in the late Carboniferous the two basic land mass were closed;(3) All Carboniferous Experienced of oceanic crust two-way subduction→Oceanic crust disappears→The formation of continental crust etc.stage. At the same time, With the during of subduction occurred completely magma series from early to late that:Tholeiite series→cak-alkaline→Alkeline, and formed with the corresponding deposit series.(4) It has unique space-time features of Mineral deposits that was formed in Carboniferous of this area,on the space with north Copper (Nickel)-in mid Gold and Copper- Iron and Gold in the south,on the time finrst phase in (359～320Ma)is belonging to early Carboniferous and second phase in (320～280Ma)is belonging to late Carboniferous.