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GEOLOGY AND GEOCHEMISTRY CONSTRAINTS ON THE GENESIS OF THE NO.2 PORPHYRY COPPER-GOLD DEPOSIT IN THE XIONGCUN DISTRICT, GANGDESE PORPHYRY COPPER BELT, TIBET, CHINA TEXT SIZE: A A A
The Xiongcun district is located in the western segment of the Gangdese porphyry copper belt (GPCB). The No.2 deposit in the Xiongcun district hosts a measured and indicated resource of 1.34 Mt copper, 76.34 t gold, and 193.78 t silver. The copper-gold mineralization of the No.2 deposit is mainly hosted in the Early Jurassic quartz diorite porphyry which intruded volcano-sedimentary rocks of the Early Jurassic Xiongcun Formation. S and Pb isotopic compositions of the ore sulfides and Re contents of molybdenite suggest a mantle source with minor contamination of subducted sediments for the ore-forming materials. Hydrogen and oxygen isotopic compositions of quartz from the quartz-sulfide veins suggest that the ore-forming fluid was a mixture of magmatic and meteoric water. Geochemical and Sr-Nd-Hf isotopic compositions of the Early Jurassic quartz diorite porphyry suggest that the mineralization of the No.2 deposit formed in an intra-oceanic island arc setting. The magmas of the Early Jurassic quartz diorite porphyry were likely sourced from partial melting of mantle with limited contamination by subducted sediments (ca. 5%). The formation of the porphyry and the No.2 deposit were related to the northward intra-oceanic subduction of the Neo-Tethys oceanic slab during the Early Jurassic.
 

Publication name

 APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH, 15 (3):477-508; 10.15666/aeer/1503_477508 2017

Author(s)

 Yin, Q; Lang, X; Cui, Z; Yan, Z; Xie, F; Wang, X

Corresponding author(s) 

 LANG X 
 langxinghai@126.com  
 -Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China
 -Chengdu Univ Technol, MLR Key Lab Tecton Controls Mineralizat & Hydroca, Chengdu 610059, Peoples R China
 -Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China

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