| 滇东南底圩金矿床矿物学与地球化学研究 |
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| 引用本文： | 肖景丹,沈能平,苏文超,何兴华,王帏.滇东南底圩金矿床矿物学与地球化学研究[J].矿物岩石地球化学通报,2021,40(2):359-370. |
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| 作者姓名： | 肖景丹 沈能平 苏文超 何兴华 王帏 |
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| 作者单位： | 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,贵阳550081;中国科学院大学,北京100049;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,贵阳550081 |
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| 基金项目： | 国家自然科学基金项目;贵州省科技计划项目 |
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| 摘 要： | 位于右江盆地南部的滇东南底圩金矿床是近年来新发现的一处金矿床,为理清其成因,对不同类型矿石和赋矿围岩进行了主、微量元素及硫化物的硫同位素分析。结果表明,相较于赋矿围岩,矿石中明显富集Au、As、Sb、Hg、Tl、S、K、C元素,应为热液带入;而Si、Mg、Fe、Zr和Th在矿石和围岩中变化不大,Fe主要来源于赋矿围岩。对矿床中的主要金属硫化物黄铁矿和毒砂进行的矿物学和硫同位素分析表明,载金矿物主要为含砷黄铁矿和毒砂,金可能主要以Au+的形式赋存在含砷黄铁矿和毒砂之中;含金硫化物具有较高的硫同位素组成(5.93‰~11.99‰),表明成矿所需的S主要为地壳来源。结合前人对于右江盆地南部相似金矿的研究,认为印支期造山作用使沉积物脱水形成的变质流体交代玄武岩,容矿岩石的硫化物化作用是底圩金矿床形成最重要的成矿作用之一。
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| 关 键 词： | 金的赋存状态 硫同位素 元素地球化学 黄铁矿 毒砂 底圩金矿床 滇东南 |
Mineralogy and Geochemistry of the Dixu Gold Deposit in the Southeastern Yunnan,China |
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| XIAO Jing-dan,SHEN Neng-ping,SU Wen-chao,HE Xing-hua,WANG Wei.Mineralogy and Geochemistry of the Dixu Gold Deposit in the Southeastern Yunnan,China[J].Bulletin of Mineralogy Petrology and Geochemistry,2021,40(2):359-370. |
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| Authors: | XIAO Jing-dan SHEN Neng-ping SU Wen-chao HE Xing-hua WANG Wei |
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| Institution: | (Sitate Key Laboratory of Ore Deposit Ceochemistry,lnstitute of Ceochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | The Dixu gold deposit in the southeastern Yunnan, China is a recently discovered gold deposit located in the southern margin of Youjiang basin. In order to explore the ore genesis of the deposit, major and trace elements of various types of ores and host rocks and sulfur isotope analyses of sulfides have been analyzed in this study. The results show that contents of Au, As, Sb, Hg, Tl, S, K, and C in ores are obviously higher than those in host rocks, suggesting the input of ore-forming fluid, whereas contents of Si, Mg, Fe, Zr, and Th in ores are similar to those in host rocks, and Fe could be mainly derived from the host rocks. Mineralogical and sulfur isotopic analyses of major metallic sulfides including pyrite and arsenopyrite of the deposit indicate that arsenian pyrite and arsenopyrite are the main gold bearing minerals in which gold could be occurred invisibly in the form of Au+. The narrow range of relatively high δ34S(5.93‰-11.99‰) values of gold-bearing arsenian pyrite and arsenopyrite suggests that the ore-forming sulfur could be mainly derived from a crustal source. Combined with previous studies on similar other gold deposits in the southern margin of Youjiang basin, it is believed that the metasomatism of basalt by metamorphic fluid derived from the dehydration of sedimentary rocks during the Indosinian orogeny could result in the important sulfidation of ore-hosting basalt to form gold-bearing arsenian pyrite and arsenopyrite in the Dixu deposit. |
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| Keywords: | occurrence state of gold sulfur isotope elemental geochemistry pyrite arsenopyrite Dixu gold deposit southeastern Yunnan |
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