Geological Characteristics And Tectonic Evolution Of Yuhai Porphyry Copper Deposit In Eastern Tianshan

There were kinds of different views about the tectonic evolution of East Tianshan, Aftera long time research, Most people tend to Rodinia supercontinent breakup and Paleo AsianOcean formed, and the ocean was at a subduction stage from the Ordovician, when the mantleplume activity superimposing in Late Paleozoic, the ocean basin disappeared till the Permianperiod, and entered the collision orogenic stage.The intrusive rock of Early Paleozoic and before being severely damaged by large-scalemagmatic activities in late Paleozoic, So, it is difficult to find the intrusive rock and depositsof the early Paleozoic and before in the Tianshan area.This research has made new progress through Yuhai copper mine being found in2011,Through data collection and collation、field exploration and analysis results, I made a detailedstudy though geological characteristics of the deposit、the orebody shape、ore types of Yuhaicopper deposit, sampling and analysis on the ore bearing rock, got the accurate geochemicalanalysis data, definition Yuhai copper deposit as a standard porphyry deposits, took theintrusive rock as diorite.Especially, The age of Yuhai intrusive rock is422.3±4.0Ma by SHRIMP U–Pb testing,with95%confidence level, It is the first one as a intrusive rock of early Paleozoic inJuluotage metallogenic belt, fills the gaps in the areas of early Paleozoic mineralization.There are different characters though Yuhai copper deposit and the others in Jueluotage,which were in the island arc belt of late Paleozoic, while in the Yuhai copper deposit therewas found no host rocks of the same and earlier times. Yuhai intrusive rock was surroundedby the Carboniferous granite on the south and Kainozoic stratum on the north, so, the Yuhaiintrusive rock was not developing here on the initial, the original rock mass should be largerand with formation in the same time or earlier. Look into this today, is experienced as a resultof large-scale tectono magmatic activities in the transformation of the later, the original strataand intrusive rock destruction.Study on theYuhai copper deposit, combined with regional tectonic evolution data andthe ancient oceanic crust of the Kangur tectonic belt, support north Tianshan ocean has beendive status from the Ordovician to early Carboniferous, provide evidence for tectonic evolution of eastern Tianshan of early Paleozoic.At last, I arranged and analyzed the distribution of porphyry copper deposit both hereand abroad, arrival at a conclusion that there may be a porphyry copper belt of earlyPaleozoic on the ancient Asian metallogenic domain.