| 雪峰弧形构造带南段牛角界钨矿区花岗岩地球化学特征 |
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| 引用本文： | 阳卫华.雪峰弧形构造带南段牛角界钨矿区花岗岩地球化学特征[J].华南地质与矿产,2019,35(2):216-225. |
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| 作者姓名： | 阳卫华 |
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| 作者单位： | 湖南省地质矿产勘查开发局四〇七队,湖南怀化,418000 |
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| 基金项目： | 湖南省财政项目"雪峰山一带金钨矿找矿方向研究" |
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| 摘 要： | 湖南牛角界钨矿区花岗岩体位于雪峰弧形构造带南段。岩体主要由细粒黑云母二长花岗岩、中细粒黑云母二长花岗岩、中粗粒黑云母二长花岗岩组成,其中钨矿化与细粒、中细粒花岗岩有关。岩石地球化学特征表明,富碱ω(Na2O+K2O)=7.58~8.23wt%)],富钾(K2O/Na2O=1.41~1.56),A/CNK=1.45~1.55,属过铝质高钾“S”型花岗岩。稀土元素总量较低(66.29×10^-6~107.78×10^-6),富集轻稀土,LREE/HREE为4.59~8.51,呈右倾型。δEu含量为0.13~0.48,远小于1,显示明显的负异常。在微量元素配分模式中,岩石富集K、W、Ba、Cs、Rb等大离子亲石元素,亏损Th、Nb、Ta、P、Zr、Yb等高场强元素。岩体形成于碰撞造山后环境,并且对牛角界钨矿的形成具有一定的贡献。
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| 关 键 词： | 牛角界钨矿区 花岗岩 地球化学 雪峰弧形构造带 |
Geochemical Characteristics of Granites in Niujiaojie Tungsten Deposit,Southern Section of Xuefeng Arc Structural Belt |
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| YANG Wei-Hua.Geochemical Characteristics of Granites in Niujiaojie Tungsten Deposit,Southern Section of Xuefeng Arc Structural Belt[J].Geology and Mineral Resources of South China,2019,35(2):216-225. |
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| Authors: | YANG Wei-Hua |
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| Institution: | (407 Geological Team of Hunan Geological and Mineral Exploration and Development Bureau,Huaihua 418000,Hunan,China) |
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| Abstract: | The granite body of the Niujiajie tungsten deposit area is located in the southern section of the Xuefeng arc structure belt. The granie is mainly composed of fine-grained biotite monzonitic granite, medium-fine-grained biotite monzonitic granite, and medium-grained biotite monzonitic granite. The tungsten mineralization is related to fine-grained and medium-fine-grained granite. The geochemical characteristics of the rock indicate: alkali-rich (Na2O+K2O=7.58-8.23 wt%), potassium-rich (K2O/Na2O=1.41-1.56), A/CNK=1.45-1.55, which belongs to aluminum high-potassium "S" type granite. The total amount of rare earth elements is relatively low, and the light rare earth is enriched. The LREE/HREE is 4.59-8.51, which is right-handed.δEu content is 0.13-0.48, showing obvious negative anomaly. In the trace element partitioning mode, the rock is enriched with large ion lithophile elements such as K, W, Ba, Cs, and Rb, and depleted in high field strength elements such as Th, Nb, Ta, P, Zr, and Yb. The formation of granite is related to plate collision, and which has a certain contribution to the formation of Niujiaojie tungsten deposit. |
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| Keywords: | Niujiaojie tungsten deposit granitoids geochemistry Xuefeng arc structure belt |
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