Geological and geochemical characteristics of the Tuwu
porphyry copper deposits in Hami|Xinjiang
Han Chunming1 Xiao Wenjiao1 Pan Chengze2 Li Yuechen2 Yan Qiming2 Qu Junfeng1 Ao Songjian1 Zhang Jien1 Guo Qianqian1 Ma Chong3 Wan Bo1
1.State Key Laboratory of Lithospheric Evolution|Institute of Geology and Geophysics|Beijing 100029； |2.Xinjiang 305
Project Office| rümqi 830000； 3.Graduate School of Chinese Academy of Science, Beijing 100049
Located in the northern margin of the ZhungaerKazakesitan plate which this plate was collided with Trim plate，the Tuwu porphyry copper deposit is one of the important deposit in the wellknown east Tianshan copperconcentrated region. Copper and copper mineralizations occur within the Late Devonian volcanic sequences of the Qieshan group. Sulfur isotopic analysis results reveal that sulfur of the ore fluids was mainly derived from deep sources，and the oxygen results reveal that magma was mainly derived from a mixed source of igneous rocks and upper crust rocks，it imply that the magma came from upper mantle，but was mixed with a small amount of crust material. ReOs and ArAr isotope dating show that copper deposit have two group ages，early Carboniferious(3473±21 Ma)and middle Carboniferious(3227±3〖CS％0,0,0,0〗〖CS〗Ma)，Singlegrain zircon UPb dating results suggest that graniteporphyry emplacement at least two times(358～301 Ma)，makeup the DevonianCarboniferous Qieshan group of the island arc magmatic belt on the palaeogeographically margin between the Tarim plate and ZhungaerKazakesitan plate.