| 滇西小龙潭矿区富碱斑岩地球化学特征与成因 |
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| 引用本文： | 张翔,于文修,刘利超.滇西小龙潭矿区富碱斑岩地球化学特征与成因[J].矿产与地质,2016(4):561-567,597. |
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| 作者姓名： | 张翔 于文修 刘利超 |
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| 作者单位： | 1. 昆明理工大学 国土资源工程学院,云南 昆明,650000;2. 云南有色地质局三一〇队,云南 大理,671000 |
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| 摘 要： | 岩石地球化学分析表明小龙潭斑岩高钾(K_2O/Na_2O=0.85~8.39)、富碱(K_2O+Na_2O=9.05%~12.45%),总体属于钾玄岩系列的岩石。岩石富集Rb、Ba、Th、LREE等大离子亲石元素而亏损Ti、Nb、Ta、HREE等高场强元素,具有较高的ΣLREE/ΣHREE比值和(La/Yb)N比值,具中等程度Eu负异常。从岩石地球化学特征分析,小龙潭富碱斑岩起源于金沙江洋壳俯冲交代作用形成的富集地幔,富碱斑岩可能与Cu、Mu、Ag成矿作用密切相关。
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| 关 键 词： | 富碱斑岩 地球化学特征 起源与成因 滇西 |
Geochemical characteristics and genesis of alkali-rich porphyry in Xiaolongtan mining area of Western Yunnan |
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| ZHANG Xiang;YU Wenxiu;LIU Lichao.Geochemical characteristics and genesis of alkali-rich porphyry in Xiaolongtan mining area of Western Yunnan[J].Mineral Resources and Geology,2016(4):561-567,597. |
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| Authors: | ZHANG Xiang;YU Wenxiu;LIU Lichao |
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| Institution: | ZHANG Xiang;YU Wenxiu;LIU Lichao;Faculty of Land Resource Engineering,Kunming University of Science and Technology;No.310 Team of Yunnan Nonferrous Metals Geological Bureau; |
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| Abstract: | The results of geochemical analysis of the rocks indicates that Xiaolongtan porphyry fall in the category of shoshonite series which is rich in potassium (K2 O/Na2 O=0.85-8.39 )and alkali (K2 O+Na2 O =9.05%-12.45%).The rocks are enriched with large ion lithophile elements including Rb,Ba,Th and LREE and are depleted with high field strength elements including Ti,Nb,Ta and HREE,with highΣLREE/ΣHREE ratio and (La/Yb)N ratio as well as medium Eu anomalies.According to the geochemical characteristics of the rocks,Xiaolongtan alkali-rich porphyry is derived from enriched mantle formed by subduction-related meta-somatism of Jinshajiang oceanic crust,and alkali-rich porphyry possibly has close relationship with minerali-zation of Cu,Mu and Ag. |
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| Keywords: | alkali-rich porphyry geochemical characteristics origin and genesis Western Yunnan |
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