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Geology and mineralization of the Pulang supergiant porphyry copper deposit(5.11 Mt)in Shangri-la,Yunnan Province,China:A review

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China Geology 2022年第4期5卷 662-695页

作者： Wen-chang Li Xiang-fei Zhang Hai-jun Yu Dong Tao Xue-long Liu College of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650093China Chengdu Center China Geological SurveyMinistry of Natural ResourcesChengdu 610081China Yunnan Geological Survey China Geological SurveyMinistry of Natural ResourcesKunming 650051China

The porphyry copper belt in the Geza island arc in southwestern China is the only Indosinian porphyry copper metallogenic belt that has been discovered and evaluated so *** Pulang porphyry copper deposit(also referred to as the Pulang deposit)in this area has proven copper reserves of 5.11×106 *** deposit has been exploited on a large scale using advanced mining methods,exhibiting substantial economic *** on many research results of previous researchers and the authors’team,this study proposed the following key insights.(1)The Geza island arc was once regarded as an immature island arc with only andesites and quartz diorite porphyrites *** understanding was overturned in this *** endmember components such as quartz monzonite porphyries and quartz monzonite porphyries have been identified in the Geza island arc,and the mineralization is mainly related to the magmatism of quartz monzonite porphyries.(2)Complete porphyry orebodies and large vein orebodies have developed in the Pulang *** orebody KT1 occurs in the transition area between the potassium silicate alteration zone of quartz monzonite porphyries and the sericite-quartz alteration *** of them have developed in the potassium silicate alteration *** main orebody occurs as large lenses at the top of the hanging wall of rock bodies,with an engineering-controlled length of 1920 m and thickness of 32.5‒630.29 m(average:187.07 m).It has a copper grade of 0.21%-1.56%(average:0.42%)and proven copper resources of 5.11×10^(6) t,which are associated with 113 t of gold,1459 t of silver,and 170×10^(3) t of molybdenum.(3)Many studies on diagenetic and metallogenic chronology,isotopes,and fluid inclusions have been carried out for the Pulang deposit,including K-Ar/Ar-Ar dating of monominerals(e.g.,potassium feldspars,biotites,and amphiboles),zircon U-Pb dating,and molybdenite Re-Os *** results show that the porphyries in the Pulang deposit are composite plutons a

关键词： Quartz monzonite porphyry porphyry orebody porphyry copper deposit Gold ore Compound mineralization Crust-mantle mixing source Indosinian Mineral exploration engineering Geza island arc Pulang Yunnan Province China

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