| 江西相山矿田西部牛头山铅锌矿化体硫化物地球化学特征及其地质意义 |
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| 引用本文： | 刘斌,魏文芳,吴建勇,伏顺成,祁家明.江西相山矿田西部牛头山铅锌矿化体硫化物地球化学特征及其地质意义[J].矿物岩石地球化学通报,2021,40(2):400-410. |
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| 作者姓名： | 刘斌 魏文芳 吴建勇 伏顺成 祁家明 |
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| 作者单位： | 核工业二九○研究所,广东韶关512029;内生金属矿床成矿机制研究国家重点实验室,南京大学地球科学与工程学院,南京210023 |
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| 基金项目： | 核工业地质局科研项目;国家重点研发计划项目 |
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| 摘 要： | 为探讨江西相山矿田西部牛头山铅锌矿化体的成矿流体性质及矿床成因,采用电子探针(EPMA)及电感耦合等离子质谱(ICP-MS)技术对不同矿化阶段的黄铁矿和闪锌矿进行了微量及稀土元素分析。结果显示,牛头山铅锌矿化体中黄铁矿的Nb/Ta<1,Th/La<1,指示该铅锌矿化溶液相对富Cl;黄铁矿与闪锌矿的Y/Ho、Zr/Hf和Nb/Ta值相差较大,表明从矿化早阶段到晚阶段,矿化流体中有大气降水混入。通过对比区内硫化物与基底变质沉积岩及各类岩浆岩(岩脉)的稀土元素配分型式,结合已发表的岩浆岩(岩脉)年龄数据,推测该铅锌矿化体的成矿物质与区内晚阶段次英安斑岩岩浆密切相关。通过对黄铁矿及闪锌矿的微量元素分析,认为其矿化成因与岩浆热液密切相关,结合矿化物质来源特征,确定该铅锌矿化体成因类型为次火山岩型。
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| 关 键 词： | 铅锌矿化体 微量元素 稀土元素 矿化成因 江西牛头山 |
Geochemical Characteristics of Sulfides from the Niutoushan Pb-Zn Ore Occurrence in the Western Xiangshan Orefield,Jiangxi Province and Their Geological Significances |
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| LIU Bin,WEI Wen-fang,WU Jian-yong,FU Shun-cheng,QI Jia-ming.Geochemical Characteristics of Sulfides from the Niutoushan Pb-Zn Ore Occurrence in the Western Xiangshan Orefield,Jiangxi Province and Their Geological Significances[J].Bulletin of Mineralogy Petrology and Geochemistry,2021,40(2):400-410. |
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| Authors: | LIU Bin WEI Wen-fang WU Jian-yong FU Shun-cheng QI Jia-ming |
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| Institution: | (Na.290 Institute of China Nuclear Corporation,Shaoguan Guangdong 512029,China;State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China) |
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| Abstract: | Geochemical characteristics of REE and trace elements of pyrites and sphalerites from different mineralization stages of the Niutoushan Pb-Zn ore occurrence in the western Xiangshan orefield of Jiangxi Province have been studied in this paper by applying EPMA and ICP-MS methods in order to discuss properties of its ore-forming fluid and its genetic type. The results show that Th/La and Nb/La values of pyrites from the Niutoushan Pb-Zn ore occurrence are all lower than 1, suggesting that the Pb-Zn ore-forming hydrothermal fluid is relatively rich in Cl. The relatively large differences between Y/Ho, Zr/Hf and Nb/Ta ratios of pyrites and those of sphalerites indicate that the meteoric water was mixed in the ore-forming fluid from the early stage to the late stage of the Pb-Zn mineralization. By comparative study of REE distribution patterns of sulfides, metamorphic sedimentary rock of the basement, and various types of magmatic rocks(dykes) in the Xiangshan orefield and combination of published dating data of magmatic rocks(dykes) in the Xiangshan orefield, it is inferred that the ore-forming material of the Niutoushan Pb-Zn ore occurrence was closely related to the magma of late stage dacite porphyry in the Xiangshan orefield. Based on the analyses of trace elements of pyrites and sphalerites, it is believed that the genesis of Pb-Zn mineralization of the Niutoushan Pb-Zn ore occurrence is closely related to the magmatic hydrothermal fluid. Combining with characteristics of the ore-forming material source, it is confirmed that the Niutoushan Pb-Zn ore occurrence belongs to the subvolcanic hydrothermal type deposit. |
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| Keywords: | Pb-Zn mineralization trace elements rare earth elements ore genesis Niutoushan Jiangxi |
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