| 西藏雄村铜金矿I号矿体赋矿凝灰岩成因探讨: 来自 岩石地球化学、Sr-Nd-Pb同位素地球化学特征的证据 |
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| 关键词:geochemistry Sr-Nd-Pb isotopes tuff genesis Xiongcun porphyry deposit Tibet |
| 基金项目:国家自然科学基金(编号: 41172077);国家973项目(编号: 2011CB403103);西藏天圆矿业资源开发有限公司项目(编号: 2006G-07);青藏专项(编号: 资[2012]03-002-055) |
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| The Genesis of Mineralized Tuff of No. I Ore Body in the Xiongcun Porphyry Copper-Gold Metallogenic Ore District, Tibet: Evidence from Geochemistry and Sr-Nd-Pb Isotopes |
| The Xiongcun porphyry copper-gold metallogenic ore concentration area is located in the north of the middle Gangdise orogenic belt. No. I, II and III main ore bodies of Xiongcun area are hosted in ore-bearing porphyries and tuff along the contact zone. This paper mainly studied geochemistry of mineralized tuff in Xiongcun No. I ore body. The mineralized tuff is similar to volcanic rocks in island arc in such geochemical characteristics as relative enrichment of LREE and LILE, depletion of HREE and HFS, low I(Sr) values (raning from 0.704163 to 0.705369, 0.704907 on average), and positive εNd(t) values (ranging from 3.7805~7.6286, 5.904121 on average). Mineralized tuff was formed in an island arc environment and was related to northwards subduction of the Neo-Tethys Ocean which occurred before India - Asian continental collision, and its source mainly came from partial melting of the juvenile basaltic strata at the bottom of the island arc. The mineral assemblage of the source region include hornblende, plagioclase and minor garnet. Mineralized tuff, ore-bearing porphyry and metallogenesis belonged to the same volcano- magma-fluid system. The mineralized tuff provided mainly external factors for the mineralization, acted as an important ore-controlling condition and also serves as an important ore-prospecting geological condition. The locations of porphyries emplaced in tuff are key ore-prospecting areas in Xiongcun area and its peripheral areas. |
| DING Feng,LANG Xing-hai,HU Zheng-hua,YANG Huan-huan,WANG Zi-zheng,ZHANG Li.2012.The Genesis of Mineralized Tuff of No. I Ore Body in the Xiongcun Porphyry Copper-Gold Metallogenic Ore District, Tibet: Evidence from Geochemistry and Sr-Nd-Pb Isotopes[J].Acta Geoscientica Sinica,33(4):546-558. |
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