| 赣南淘锡坑钨矿床云英岩中含CO2包裹体的发现及意义 |
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| 引用本文： | 刘永超,李建康,赵正,刘善宝,李兴杰.赣南淘锡坑钨矿床云英岩中含CO2包裹体的发现及意义[J].地质学报,2019,93(3):701-711. |
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| 作者姓名： | 刘永超 李建康 赵正 刘善宝 李兴杰 |
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| 作者单位： | 中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京,100037;中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京,100037;中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京,100037;中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京,100037;中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京,100037 |
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| 基金项目： | 本文为国家重点研发计划项目（编号 2016YFC0600204，2016YFC0600208），中央级公益性科研院所基本科研业务费项目（编号 JYYWF201814），中国地质调查局地质调查项目（编号 DD20160056）联合资助成果。 |
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| 摘 要： | 淘锡坑矿床是赣南地区一大型黑钨矿矿床,为揭示成矿流体的早期演化特征,深入认识钨元素的富集机制,本文对淘锡坑钨矿床云英岩中流体和熔体包裹体进行了岩相学、激光拉曼光谱和显微测温研究。结果表明,云英岩中的流体包裹体可以划分为富液相两相水溶液包裹体、富气相含CO_2水溶液包裹体和纯气相包裹体三类,流体为中—高温、低盐度、低密度的NaCl-H_2O-CO_2-CH_4体系。熔体包裹体主要由钠长石、石英、少量流体相和气相组成,气相部分含有CH_4和微量CO_2。在岩浆热液演化早期阶段,流体氧化还原条件可能发生了改变,发生了CH_4到CO_2的转变,致使流体中CO_2含量增高。在流体演化过程中发生的以CO_2散逸为特征的流体不混溶作用可能是淘锡坑钨矿床形成的重要机制。CO_2对于钨元素的迁移和富集具有重要作用,CO_2的散逸是诱发黑钨矿沉淀富集的重要因素之一。
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| 关 键 词： | 淘锡坑钨矿 云英岩 流体包裹体 熔体包裹体 CO2 成矿流体 |
| 收稿时间： | 2018/1/30 0:00:00 |
| 修稿时间： | 2018/6/25 0:00:00 |
Discovery of CO2- bearing inclusions in greisen from the Taoxikeng tungsten deposit, southern Jiangxi Province and its metallogenic significance |
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| LIU Yongchao,LI Jiankang,ZHAO Zheng,LIU Shanbao and LI Xingjie.Discovery of CO2- bearing inclusions in greisen from the Taoxikeng tungsten deposit, southern Jiangxi Province and its metallogenic significance[J].Acta Geologica Sinica,2019,93(3):701-711. |
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| Authors: | LIU Yongchao LI Jiankang ZHAO Zheng LIU Shanbao and LI Xingjie |
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| Institution: | MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing, 100037,MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing, 100037,MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing, 100037,MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing, 100037 and MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources,Chinese Academy of Geological Sciences, Beijing, 100037 |
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| Abstract: | The Taoxikeng tungsten deposit is a large wolframite deposit in southern Jiangxi Province. In order to reveal the early evolution characteristics of ore- forming fluids and the enrichment mechanism of tungsten, we carried out study of fluid and melt inclusions in greisen by means of petrography, laser Raman spectroscopy and microthermometric experiments. The results show that fluid inclusions can be divided into three types: liquid- rich two- phase aqueous inclusions, vapor- rich CO2- bearing inclusions and pure gas inclusions. The ore- forming fluids are characterized by medium- high temperature, low salinity and low density, roughly belonging to NaCl- H2O- CO2- CH4 system. Melt inclusions are mainly composed of albite, quartz, with minor amount of fluid and gas, and gas phase contains CH4 and trace CO2. In the early stage of magmatic hydrothermal evolution, the redox conditions of the fluid might have been changed, resulting in a shift of CH4 to CO2 and an increase in CO2 content of the fluid. Fluid immiscibility, which is characterized by the dissipation of CO2, could be the main mechanism responsible for the formation of the Taoxikeng tungsten deposit. Carbon dioxide plays a significant role in the migration and enrichment of tungsten, and the dissipation of CO2 component is one of the important factors that induce the precipitation and enrichment of wolframite. |
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| Keywords: | Taoxikeng tungsten deposit greisen fluid inclusion melt inclusion CO2 ore- forming fluid |
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