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The Metallogensis,Deposit Model and Prospecting Direction of the Ga'erqiong-Galale Copper-gold Ore Field,Tibet

TANG Ju-xing 1),ZHANG Zhi 2),LI Zhi-jun 2),SUN Yan 2),YAO Xiao-feng 3),HU Zheng-hua 4),WANG Hong-xing 2),SONG Jun-long 2),HE Lin 5) 1) Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037;2) Chengdu University of Technology,Chengdu,Sichuan 610059;3) China University of Geosciences(Beijing),Beijing 100083;4) Jiangxi Institute of Geological Survey,Nanchang,Jiangxi 330000;5) No.2 Geological Party,Tibet Bureau of Geology and Mineral Resources Exploration,Lhasa,Tibet 850000  
Located in the south of western Bangong Co-Nujang River metallogenic belt of north Gangdise,the Ga'erqiong-Galale copper-gold ore field possesses lots of ore body types(porphyry type,skarn type and iron oxide-copper-gold type) and high gold grade(up to 205 g/t) and unique structural position,thus having great research significance.According to systematic summary of ore concentration areas and systematic analysis of data,the authors identified ore characteristics,found a large number of native gold and intermetallic compounds,and summarized the metallogensis.It is considered that metallization was mainly associated with emplacement of quartz diorite and granodiorite in the late phase of Yanshanian period,the evolution time between diagenesis and mineralization was about 1 Ma,and the mineralization in the area was characterized by the vertical zoning of copper-gold in the upper part and molybdenum in the lower part.S,Pb isotopes suggest that the metallogenic material had characteristics of crust-mantle mixing.During the emplacement and fractionation evolution of metaluminous-weak peraluminous calc-alkaline-high-K calc-alkaline magmatite,the porphyry-skarn type copper-gold-molybdenum ore bodies were formed in the area of pluton uplifting and along the contact zone between the pluton and the Cretaceous carbonate,whereas iron oxide-copper-gold type ore bodies were formed at the edge of pluton's tectonic fracture zone(F 1 fault).On such a basis,the authors have established the porphyry-skarn-iron oxide-copper-gold type "three-position" mineralization deposit model of magmatitestrata-ore-controlling structure.Based on these data,the authors indicate the prospecting direction in search for new ore bodies in the ore field.
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