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《Geology and Exploration》 2012-02
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An Exploration Model of the Duobuza Porphyry Cu-Au Deposit in Gaize Country,Northern Tibet

LI Yu-bing1,2,DUO Ji3,ZHONG Wan-ting1,LI Yu-chang2,QIANG Bawangdui2,CHEN Hong-qi2,LIU Hong-fei5,ZHANG Jin-shu5,ZHANG Tianping2,XU Zhi-zhong2,FAN An-hui2,SUO Langwangqin 2(1.Cheng Du University of Technology of Earth,Cheng Du,Sichuan 610059;2.Tibet Geological Exploration Bureau of NO.5Geological Team,Golmud,Qinghai 816000;3.Tibet Geological Exploration Bureau,Lhasa,Tibet 650000;4.Tibet Geological Survey Institute,Lhasa,Tibet 650000)  
The Duobuza porphyry Cu-Au deposit of Gaize country in Tibet,newly-discovered by the Geological Brigade No.5 of Tibet,is a giant copper-gold deposit in the Bangong Lake-Nujiang metallogenic belt.It is another significant prospecting breakthrough after the Yulong,Qulong,Xiongcun and Jiama deposits,and also the first super-large porphyry Cu-Au deposit located in the Bangong Lake-Nujiang metallogenic belt.The Duobuza porphyry Cu-Au deposit occurs in the contact zones between Early Cretaceous granodiorites and Upper Jurassic Quse Formation degenerative quartzose arkose.This deposit possesses favorable metallogenic background where active magnetic activity provided good conditions for porphyry copper-gold mineralization.It presents typical alteration zoning characteristics of porphyry copper,showing potassium silication,beresitization,muddy zones and hornfels from porphyries to wall rocks.Geophysical survey shows that the ore-bearing porphyry has a low polarization rate and high apparent resistivity.The 1:10000 soil survey data reveals porphyry copper deposits are commonly discovered at high Cu and Au equatorial anomaly areas,corresponding to high strength and distinct concentration centers of Cu,Au,Ag and Mo geochemistry comprehensive abnormal areas.Furthermore,it especially coincides with the Cu and Au abnormal position.The 1:50000 stream sediment geochemical anomalies reveal that high anomalies of Au,Ag,As,Sb,Cu,Pb and Zn always coincide with the anomalies by induced electric detection.This paper establishes a geology-geophysics-geochemistry exploration model based on integrated studies.Through prospecting and initial evaluation,we discovered other porphyry deposits such as the Bolong,Nadun,Naruo,Saijiao,Ga'erqin,Tiegelong,Dibaonamugang porphyry deposits in the surrounding areas,forming the Duolong porphyry copper-gold concentration.This may provide guidance significance for regional prospecting in this region.
【Fund】: 中央公益性行业专项(项目编号:201011013);; 西藏班公湖-怒江成矿带西段铜多金属资源调查(编号1212010530102);; 国家973项目(编号2011CB403103);; 自然科学基金(项目编号:41172077)资助的成果
【CateGory Index】: P618.41
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