湖南瑶岗仙钨矿床流体包裹体特征及其意义
Characteristics and significance of the fluid inclusions from Yaogangxian tungsten deposit in south of Hunan
查看参考文献55篇
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文摘
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对瑶岗仙石英脉型钨矿床的石英、萤石和夕卡岩型钨矿床中石榴石流体包裹体的岩相学特征研究表明,与成矿有关的包裹体主要有三类:富液相、富气相和含子晶的多相包裹体.脉型钨矿床中石英包裹体均一温度范围为180℃～300℃,盐度0.88～6.45 wt%NaCl eqv;矽卡岩型钨矿床中石榴石包裹体的均一温度范围为190℃～300℃,盐度0.1～8.95wt%NaCl eqv;成矿溶液的密度为0.81～0.89 g/cm~3,表明形成这两种类型矿床的成矿流体均属于中温、低盐度、低密度的流体;成矿压力为120～160 MPa,成矿深度约为7～9 km,因此该矿床是在中高压力、中深成条件下形成的.激光拉曼探针分析表明,石英中包裹体的气相成分比石榴石中的更富含CH_4、CO_2和H_2O等挥发份,说明流体是一种介于岩浆与热液之间的过渡性流体,具有上部偏液、下部偏浆的特点.由于该区自燕山期以来软流圈上隆,岩石圈经历了强烈的伸展、减薄作用和壳幔相互作用,而C-H还原性组分的增加,指示流体很可能来自于深部的地幔过渡带或者软流圈. |
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其他语种文摘
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There are three dominant types of fluid inclusion related to metallogensis in Yaogangxian quartz-vein wolframite deposit and skarn scheelite deposit ： liquid-rich inclusion, gas-rich two-phase inclusion and daughter-minerals bearing polyphase inclusion. The homogenized temperatures and salinity of fluid inclusions in quartz range from 180℃ to 300℃ and from 0.88 to 6.45 wt% NaCl eqv, of the inclusions in garnet vary from 190℃ to 300℃ and from 0.1 to 8.95 wt% NaCl eqv respectively. Density of the fluids is 0.81～0.89g/cm~3. These features represent that the fluids are medium temperature, low density and low salinity in the two types of fluids in this tungsten deposits. Pressure of the fluid was 120～160MPa, indicating that the two types of tungsten deposits were formed at depth of 7～9km. The analytic results get by Laser Laman Spectroscopy, indicate that the fluid is rich in volatile components, such as CH_4, CO_2 and H_2O. Therefore, from the formation of the skarn scheelite to the quartz-vein, the fluid is the transitional fluid between magma and hydrothermal. Since Yanshanian Period, this area suffered asthenosphere upwelling, lithospheric extension, thinning and crustmantle interaction, so the fluid riched in C-H of W-bearing quartz vein of Yaogangxian tungsten deposit most likely came from mantle transition belt or asthenosphere. |
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来源
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岩石学报
,2007,23(9):2263-2273 【核心库】
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关键词
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瑶岗仙
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石英脉型黑钨矿矿床
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流体包裹体
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激光拉曼探针分析
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成矿物质来源
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地址
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1.
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, 550002
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冈山大学地球物质科学研究所, 日本
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0569 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程重要方向项目
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国家自然科学基金
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国家973项目(2007CB411408)
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文献收藏号
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CSCD:3010253
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