| 西藏浦桑果铜多金属矿床侵入岩的地球化学特征及对构造环境的约束 |
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| 关键词:copper-polymetallic deposit intrusive rock geochemistry tectonic setting constraints |
| 基金项目:中国地质调查局项目“西藏大型矿床成矿专属性研究”(编号: 1212011221073);成都地质调查中心项目“西藏冈底斯成矿带构造岩浆演化与成矿作用研究”(编码: 1212010818098) |
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| Geochemical Characteristics of Intrusive Rocks in the Pusangguo Copper-Polymetallic Deposit, Tibet: Constraints on Tectonic Setting |
| The Pusangguo copper-polymetallic deposit is located in Nanmulin volcanic basin. Petrographic and geochemical studies of granodiorite, granodiorite-porphyry and diorite-porphyrite show that the intrusive rocks are of calc-alkaline series, with ω(SiO2) ranging from 59.08% to 67.28%, ω(Al2O3) ranging from 15.38% to 16.86%, ω(MgO) ranging from 1.52% to 4.06%, and ω(TFeO) ranging from 1.2% to 3.46%. Total REE concentrations range from 22.0×10-6 to 148.56×10-6, LaN/YbN ratios vary from 17.98 to 37.57, with the enrichment of LREE. Granodiorite, granodiorite-porphyry and diorite-porphyrite are enriched with LILE elements such as Cs, Rb and Sr and depleted in HFSE elements such as Th, U and Nb, with weak or intensely negative Eu anomalies and no or weak Ce anomalous features. Petrographic and geochemical studies indicate that granodiorite-porphyry and diorite-porphyrite were produced by Tethys subduction towards North Lhasa tectonic body, and granodiorite was formed in an extension setting of post-collision in Tibet Plateau. |
| CUI Xiao-liang,Dorji,LIU Hong-fei,ZHANG Jin-shu,LIU Ting-ting,SU Deng-kui,Phurbu Tsering,DU Gang-qiang,LIU Zu-jun.2012.Geochemical Characteristics of Intrusive Rocks in the Pusangguo Copper-Polymetallic Deposit, Tibet: Constraints on Tectonic Setting[J].Acta Geoscientica Sinica,33(4):537-545. |
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