| 西藏仲巴县天宫尼勒矽卡岩型铜金矿床锆石U-Pb年代学和岩石地球化学特征: 对成因及其成矿构造背景的指示 |
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| 关键词:zircon U-Pb age rock geochemistry tectonic setting Cu-Au deposit Gangdise Tiangongnile |
| 基金项目:国家重点基础研究发展计划(编号: 2011CB403100);青藏专项“西藏铜铅锌国家级接替基地综合研究”(编号: 1212011121239);“西藏大型矿床成矿专属性研究”(编号: 1212011221073);“班公湖-怒江成矿带铜多金属成矿规律综合研究” (编号: 1212011086074) |
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| Zircon U-Pb Geochronology and Geochemistry of the Tiangongnile Skarn-type Cu-Au Deposit in Zhongba County, Tibet: Their Genetic and Tectonic Setting Significance |
| The Tiangongnile Cu-Au deposit located in the northern part of the Gangdise metallogenic belt is a skarn-type deposit closely related to granodiorite. Zircon ICP-MS U-Pb weighted average age of the granodiorite is 102.6±1.8 Ma, indicating that the deposit was formed during the Early Cretaceous period. Element geochemical data indicate that the diorite is characterized by high Al2O3, rich Na2O and low TiO2, thus belonging to metaluminous calc-alkaline series. Trace elements are characterized by enrichment of large ion lithophile elements(LILE) and depletion of high field strength elements (HFSE) and heavy rare earth elements, with Nb and Ta negative anomalies, suggesting that the diorite has geochemical features of island arc rock and its petrogenesis may be related to magmatic activity induced by the subduction of Bangong Co–Nujiang River oceanic crust plates. In combination with regional tectonic evolution, it is held that the Tiangongnile Cu-Au deposit might have been formed in an island-arc environment before southward subduction and closure of Bangong Co-Nujiang River oceanic crust plates. |
| HUANG Han-xiao,LI Guang-ming,LIU Bo,DONG Sui-liang,SHI Hong-zhao,ZHANG Zhi-lin,FAN An-hui.2012.Zircon U-Pb Geochronology and Geochemistry of the Tiangongnile Skarn-type Cu-Au Deposit in Zhongba County, Tibet: Their Genetic and Tectonic Setting Significance[J].Acta Geoscientica Sinica,33(4):424-434. |
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