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《Mineral Deposits》 2009-06
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Geochemistry and Pb,Sr,Nd isotopic features of ore-bearing porphyries in Bangong Lake porphyry copper belt,western Tibet

XIN HongBo1,QU XiaoMing1,WANG RuiJiang1,LIU HongFei2,ZHAO YuanYi1 and HUANG Wei2 (1 Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;2 Tibet Institute of Geological Survey,Lhasa 850000,Tibet,China)  
Detailed geochemical and Pb,Sr,Nd isotopic researches on the Duobuza copper deposit and the Garqiong copper deposit were conducted in the Bangong Lake copper belt.The result shows that,compared with the porphyries of the Gandese copper belt,the ore-bearing porphyries of the Bangong Lake copper belt are weaker in the enrichment of large ion lithophile elements (LILE) and are also weaker in the depletion of high-field strength elements and high rare elements,thus having weak positive Eu anomaly.Viewed from Pb,Sr,Nd isotopic features,the ore-bearing porphyries are characterized by the enrichment of radiogenic Pb,the obviously low ratios of 143Nd/144Nd,and the source nearer to the Indian Ocean sedimentary area,indicating that the magma source of the ore-bearing porphyries is much shallower,with the mixture of more crustal materials.The forming tectonic environment of the ore-bearing porphyries in the Bangong Lake copper belt belonged to the active continental ridge,whereas that in the Gangdese copper belt was far away from the active continental ridge.The Bangong Lake porphyry copper belt was formed in a post-collisional crustal up-lift stage,whereas the Gangdise porphyry copper belt in a stage of post-collisional crustal extensional collapse when the crust rose to the maximum height.
【Fund】: “十一五”国家科技支撑计划项目(2006BAB0105A05);; 中央级公益性科研院所基本科研业务费专项资金项目(K2007-1-11);; 中国地质调查局地质调查工作项目(1212010818097)的联合资助
【CateGory Index】: P618.41
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