Finding and Significances of Chongjiang Porphyry Copper (Molybdenum, Aurum) Deposit,Tibet
Finding and Significances of Chongjiang Porphyry Copper (Molybdenum, Aurum) Deposit,Tibet
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发表时间：
2004
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通讯作者：
Zheng You-ye;Gao Shunbao
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作者：
Zheng You-ye;Gao Shunbao
冲江铜存款是近年来在西藏发现的大型斑岩铜（钼、金）存款矿床。这也是冈底斯造山带寻找斑岩铜矿存款过程中首次取得重大突破。该存款在矿化蚀变带中具有环形和表型特征。铜矿化大致与钾硅蚀变带有关。研究中采用了含矿岩石的ICPMS、辉橄榄岩的Re-Os定年和锆石的U-Pb定年等方法。结果表明，成矿斑岩富集K、Na、Al和轻稀土元素，LREE/HREE较高（8.56-23.1）。该斑岩Eu正常（δEu=1.001），Ce弱负异常（δCe=0.84），具Ⅰ型和A型之间的过渡花岗岩特征。这些特征反映了与软流圈上涌有关的岩浆活动。冲江斑岩铜（钼、金）存款形成于14-16 Ma造山带挤压与伸展的过渡时期。
The Chongjiang copper deposit is a large porphyry copper (molybdenum, aurum) deposit found in Tibet in recent years. It is also the first one that has made great breakthrough during the process of looking for porphyry copper deposit in Gangdise orogenic belt. The deposit has the characters of circular and surfacing model in mineralization and alteration belt. Cu mineralization is according to K-Si alteration belt approximately. Methods such as ICPMS on the rocks with mineralization, Re-Os dating on molybdenite and U-Pb dating on zircon, were used in this research. The results show that the mineralizing porphyry enriches in K, Na, Al and light rare earth element (LREE) with high LREE/HREE (8.56-23.1). The porphyry is normal in Eu (δEu=1.001), but weak negative abnormal in Ce (δCe=0.84), and shows the characteristics of the transitional granite between type Ⅰ and type A. The characteristics reflect the magmatism related to asthenospheric upwelling. The Chongjiang porphyry copper (molybdenum, aurum) deposit formed in 14-16 Ma, the transitional period of extrusion and extension in orogenic belt.