The Genesis in Yunnan of Zhongdian Pulang Porphyry Copper Deposit

The Pulang porphyry copper deposit located in the Yidun arc with the southern section,produced in the Indo-porphyry in the early Yanshan Pulang duplex. Main rocks from the quartz diorite porphyry、quartz monzonite porphyry and composed of granodiorite porphyry,the feature of petrochemistry and geochemistry show alkaline rock series of I-type granite. Ore-forming fluids high salinity and forming temperature from 150 to 300 ℃. Sulfur isotope δ34SCDT:-2.23‰～3.75‰,from deep magma.The metallogenic mechanism of the construction of the role of deposit、hydraulic fracturing and the formation of alteration veins etc undergone a complex process. Diagenesis and mineralization time is roughly 235 ～ 206 Ma.with a multi-stage,and the one quartz-molybdenite mineralization stage for (213 ± 3.8) Ma,nThe principal age of diagenesis and mineralization is the Indo-Chinese epoch. Alteration outward from the center were:K of silicified zone-sericite alteration zone-propylitic alteration zone(hornfels)of face alteration features.The genetic type is the island arc porphyry copper deposit.