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| 广西大厂锡矿铟的地球化学特征及成因机制初探 | |
| 引用本文： | 李晓峰,杨 锋,陈振宇,卜国基,王义天.广西大厂锡矿铟的地球化学特征及成因机制初探[J].矿床地质,2010,29(5):903-914. |
| 作者姓名： | 李晓峰 杨 锋 陈振宇 卜国基 王义天 |
| 作者单位： | 1. 中国地质科学院矿产资源研究所,北京,100037;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,550001 2. 桂林理工大学地球科学学院,广西,桂林,541004 3. 中国地质科学院矿产资源研究所,北京,100037 4. 柳州华锡集团有限责任公司,广西,柳州,545005 |
| 基金项目： | 本研究得到中央级公益性科研院所基本科研业务费专项资金（K2007-01-07）和广西地质工程中心重点实验室主任基金（07109011-Z014）的联合资助 |
| 摘 要： | 广西大厂锡矿位于江南古陆西南缘，桂西北海西-印支期被动陆缘裂谷盆地北部的断裂凹陷盆地中，是中国重要的、以锡为主的有色金属矿床。它主要由长坡-铜坑和高峰矿床、拉么矿床、大福楼矿床和亢马矿床等组成，其铟资源量约6 000 t。文章在对长坡-铜坑矿床、高峰矿床以及拉么矿床不同类型围岩（包括花岗岩质岩石）、矿石以及不同矿床类型中矿石矿物（硫化物和氧化物）中的In、Cu、Cd、Sn、Fe、Zn等微量元素分析的基础上，结合不同类型矿床、不同矿物组合中硫化物的微量元素电子探针测试以及硫同位素分析结果，初步认为大厂锡矿岩浆源区是富铟的，在正常的沉积岩中不存在铟的初始富集；In主要赋存于闪锌矿中，与层状和块状的矿体关系密切。在成矿作用过程中，In的分布和富集对矿物组合和矿石类型具有明显的选择性。大厂铟矿的形成是富铟的岩浆源区重融产生含铟岩浆，在岩浆侵位冷却过程中，由岩浆结晶所产生的流体携带In、Cu、Fe、Zn、Sn等成矿元素从岩浆中出溶，形成含In的成矿流体。水-岩反应以及在大气降水来源流体的参与下，导致In、Cu、Fe、Zn、Sn等从成矿流体中沉淀、富集成矿。 |
| 关 键 词： | 地球化学 元素分布 成矿机制 硫碳氧同位素 闪锌矿 铟 大厂 |
A tentative discussion on geochemistry and genesis of indium in Dachang tin ore district, Guangxi |
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| LI XiaoFeng,YANG Feng,CHEN ZhenYu,BU GuoJi,WANG YiTian.A tentative discussion on geochemistry and genesis of indium in Dachang tin ore district, Guangxi[J].Mineral Deposits,2010,29(5):903-914. | |
| Authors: | LI XiaoFeng YANG Feng CHEN ZhenYu BU GuoJi WANG YiTian |
| Abstract: | Located in the fault depression basin of the North Hercynian-Indosinian passive continental margin on the southwestern margin of Jiangnan orogenic belt, the Dachang tin ore district is an important tin-polymetallic ore district with Cu, Zn, Pb, In, Sb and Ag resources. The ore district consists of Changpo-Tongkeng deposit and Gaofeng deposit in the west, Lamo skarn deposit in the middle and Dafulou as well as Kengma deposit in the east, with total indium resource about 6 000 tons. This paper deals emphatically with the Changpo-Tongkeng deposit, Lame deposit and Gaofeng deposit, and analyzes In, Cu, Cd, Fe and Zn concentrations in their host rocks, ores, sulfides and oxides as well as in granite of the ore district. Based on EMPA data of sulfides and oxides, sulfur isotope data of sulfides, carbon and oxygen isotope data of host rocks and carbonate, the authors have found that the magma source is rich in indium in the Dachang ore district, whereas abnormal indium concentration exists in the host rocks. Most indium is hosted in sphalerite, and is closely associated with massive and layered ores. Indium was selectively concentrated and distributed in different mineral assemblages and ores during indium mineralization. It is held that the indium-rich magma source was a melt, which was subsequently emplaced and intruded into the upper crust. In, Cu, Fe, Zn and Sn-bearing fluids were exsolved from the cooling magma. In was precipitated with Zn, Fe, Cu and Sn metals because of water-rock interaction and mixture of fluids with meteoric water. |
| Keywords: | geochemistry element distribution ore-forming mechanism sulfur carbon and oxygen isotope sphalerite indium Dachang |
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