| 湘中秋旺冲金矿区脉岩岩石学与地球化学特征及其地质意义 |
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| 引用本文： | 周溪,彭建堂,鲁玉龙,徐军伟,谢帅,谢青.湘中秋旺冲金矿区脉岩岩石学与地球化学特征及其地质意义[J].岩石矿物学杂志,2020,39(4):441-453. |
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| 作者姓名： | 周溪 彭建堂 鲁玉龙 徐军伟 谢帅 谢青 |
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| 作者单位： | 湖南省有色地质勘查局 二总队, 湖南 湘潭 411102;中南大学 地球科学与信息物理学院 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083,中南大学 地球科学与信息物理学院 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083;中国科学院 地球化学研究所 矿床地球化学国家重点实验室, 贵州 贵阳 550002,湖南省有色地质勘查局 二总队, 湖南 湘潭 411102;中南大学 地球科学与信息物理学院 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083,湖南省有色地质勘查局 二总队, 湖南 湘潭 411102;中南大学 地球科学与信息物理学院 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083,湖南省有色地质勘查局 二总队, 湖南 湘潭 411102,湖南省有色地质勘查局 二总队, 湖南 湘潭 411102;中南大学 地球科学与信息物理学院 有色金属成矿预测与地质环境监测教育部重点实验室, 湖南 长沙 410083 |
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| 基金项目： | 国家自然科学基金资助项目（41972090，41473043） |
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| 摘 要： | 对位于湘中EW向白马山-紫云山成矿带东端的秋旺冲金矿区中的脉岩进行了岩石学和地球化学研究。研究结果显示,这些脉岩主要为似斑状花岗岩、含电气石花岗岩和文象花岗岩属富硅、富碱的准铝-弱过铝质、钙碱性花岗岩,其地球化学特征表现为富集Rb、K、Th、U、Ce、Nd、Zr和Hf元素,强烈亏损Ra、Sr、P和Ti元素,稀土元素总量低,轻重稀土元素分馏均不明显,重稀土元素相对较富集,Eu负异常极为明显。通过岩石成因和构造环境判别图解结合区域上前人的研究成果,提出该区脉岩成因类型属于高分异的Ⅰ型花岗岩,是在碰撞造山后伸展构造环境中形成的。综合矿区及毗邻矿床的地质勘查资料分析,认为该区脉岩与金矿化存在空间对应关系,对金成矿有指示意义。
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| 关 键 词： | 地质意义 岩石学 地球化学 脉岩 秋旺冲 湘中 |
| 收稿时间： | 2020/3/8 0:00:00 |
Petrology and geochemical characteristics of felsic dykes in the Qiuwangchong gold deposit, central Hunan, and their geological significance |
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| ZHOU Xi,PENG Jian-tang,LU Yu-long,XU Jun-wei,XIE Shuai and XIE Qing.Petrology and geochemical characteristics of felsic dykes in the Qiuwangchong gold deposit, central Hunan, and their geological significance[J].Acta Petrologica Et Mineralogica,2020,39(4):441-453. |
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| Authors: | ZHOU Xi PENG Jian-tang LU Yu-long XU Jun-wei XIE Shuai and XIE Qing |
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| Institution: | No. 2. Geological Party, Hunan Geological Exploration Bureau of Nonferrous Metals, Xiangtan 411102, China;Key Laboratory of Non-ferrous Metals Metallogenic Prediction of Ministry of Education, School of Geosciences and Info-physics, Central South University, Changsha 410083, China,Key Laboratory of Non-ferrous Metals Metallogenic Prediction of Ministry of Education, School of Geosciences and Info-physics, Central South University, Changsha 410083, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China,No. 2. Geological Party, Hunan Geological Exploration Bureau of Nonferrous Metals, Xiangtan 411102, China;Key Laboratory of Non-ferrous Metals Metallogenic Prediction of Ministry of Education, School of Geosciences and Info-physics, Central South University, Changsha 410083, China,No. 2. Geological Party, Hunan Geological Exploration Bureau of Nonferrous Metals, Xiangtan 411102, China;Key Laboratory of Non-ferrous Metals Metallogenic Prediction of Ministry of Education, School of Geosciences and Info-physics, Central South University, Changsha 410083, China,No. 2. Geological Party, Hunan Geological Exploration Bureau of Nonferrous Metals, Xiangtan 411102, China and No. 2. Geological Party, Hunan Geological Exploration Bureau of Nonferrous Metals, Xiangtan 411102, China;Key Laboratory of Non-ferrous Metals Metallogenic Prediction of Ministry of Education, School of Geosciences and Info-physics, Central South University, Changsha 410083, China |
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| Abstract: | Some felsic dykes have been discovered in recent years in the Qiuwangchong mining area, located in the eastern part of the EW-striking Baimashan-Ziyunshan metallogenic belt in central Hunan. Petrology and whole-rock geochemistry of these felsic dykes were studied in this paper. It is revealed that these dykes, lithologically, are mainly composed of porphyritic granite, tourmaline-bearing granite and graphic granite. In terms of geochemical characteristics of elements, these dykes in the Qiuwangchong deposit belong to the metaluminous to weakly peraluminous, calc-alkaline granite, and exhibit Si- and alkaline-enrichment signature. All dykes are rich in K, Rb, Th, U, Ce,Nd, Zr and Hf, but obviously depleted in Ba, Sr, P and Ti. In general, the total REE concentrations in these dykes are relatively low, and no obvious fractionation took place between LREE and HREE. All dykes are characterized by HREE-enrichment, with an extremely obvious negative Eu anomaly. Based on the discrimination diagrams of petrogenetic types and tectonic setting, in combination with previous studies for regional dykes, it is concluded that the dykes in this study belong to the highly-fractionated I-type granite, which was emplaced under the post-orogenetic extensional tectonic background. According to geological data in the study area and its adjacent areas, it can be concluded that these dykes are spatially associated with gold mineralization, and they are indicative of ore genesis and the further prospecting for gold mineralization in the study area. |
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| Keywords: | geological significance petrology geochemistry felsic dykes Qiuwangchong central Hunan |
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