| 黔西南紫木凼金矿床流体包裹体特征及对成矿的指示意义 |
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| 引用本文： | 彭义伟,顾雪祥,刘丽,程文斌,章永梅,吴程赟,吕鹏瑞.黔西南紫木凼金矿床流体包裹体特征及对成矿的指示意义[J].矿物学报,2012,32(2):211-220. |
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| 作者姓名： | 彭义伟 顾雪祥 刘丽 程文斌 章永梅 吴程赟 吕鹏瑞 |
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| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083
2. 成都理工大学地球科学学院,四川成都,610059 |
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| 基金项目： | 国家自然科学基金项目，国家重点基础研究发展计划，长江学者和创新团队发展计划，高等学校学科创新引智计划 |
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| 摘 要： | 紫木凼金矿床是黔西南微细浸染型（卡林型）金矿带上的一个代表性金矿床。本文对该矿床主成矿阶段（Ⅱ）石英和方解石以及晚成矿阶段（Ⅲ）方解石中的流体包裹体进行了岩相学和显微测温研究,结果表明,各成矿阶段包裹体类型有H2O包裹体、CO2包裹体、CO2-H2O包裹体、气相CH4包裹体和CH4-H2O包裹体5类,其中CO2包裹体和CO2-H2O包裹体只在主成矿阶段（Ⅱ）的石英中发育。主成矿阶段和晚阶段流体包裹体均一温度范围分别为180～220℃和100～180℃,盐度分别为0.35%～7.45% NaCl和0.18%～5.71% NaCl,密度分别变化于0.745～0.969 g/cm3和0.868～0.993 g/cm3,总体属于中低温、低盐度、中等密度的H2O-NaCl-CO2流体体系。矿床成矿过程是一个温度退缩、盐度降低、密度增大的过程。主成矿阶段H2O-NaCl-CO2流体发生不混溶作用,是导致矿质沉淀成矿的主要原因。CO2流体、CH4流体在金的成矿过程中起重要作用。
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| 关 键 词： | CO2流体 CH4流体 流体包裹体 不混溶作用 紫木凼金矿床 |
Fluid Inclusion Characteristics and Implications to Mineralization in the Zimudang Gold Deposit in Southwest Guizhou Province, China |
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| PENG Yi-wei,GU Xue-xiang,LIU Li,CHENG Wen-bin,ZHANG Yong-mei,WU Cheng-yun,LV Peng-rui.Fluid Inclusion Characteristics and Implications to Mineralization in the Zimudang Gold Deposit in Southwest Guizhou Province, China[J].Acta Mineralogica Sinica,2012,32(2):211-220. |
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| Authors: | PENG Yi-wei GU Xue-xiang LIU Li CHENG Wen-bin ZHANG Yong-mei WU Cheng-yun LV Peng-rui |
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| Institution: | 1(1.School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China; 2.College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China) |
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| Abstract: | The Zimudang gold deposit is a typical example of micro-disseminated(Carlin-type) gold deposits in Southwest Guizhou Province,China.The petrographic observation and microthermometric study were carried out on the fluid inclusions from main stage (Ⅱ) quartz and calcite as well as late stage (Ⅲ) calcite from the deposit.Major types of fluid inclusions include aqueous inclusions,pure CO2 inclusions,CO2-H2O inclusions,CH4 inclusions,and CH4-H2O inclusions.The pure CO2 inclusions and CO2-H2O inclusions were only recognized in the main stage (Ⅱ) quartz.The homogenization temperatures,salinities and densities of the main stage (Ⅱ) range 180–220 ℃,0.35%–7.45% of NaCl,and 0.745-0.969 g/cm3,respectively,while those of the late stage (Ⅲ) vary in the ranges of 100–180℃,0.18%–5.71% NaCl,and 0.868-0.993 g/cm3,respectively.The ore-forming fluids were characterized by a H2O-NaCl-CO2 system with medium to low temperature,low salinity,and medium density.The fluid inclusiondata indicate that the gold mineralization was a process of decrease in temperature and salinity and slight increase in density of the ore-forming fluids.Immiscibility of the H2O-NaCl-CO2 fluid system occurred during the main mineralization stage (Ⅱ),resulting precipitation of Au and formation of the ore deposit.The CO2-and CH4-bearing fluid played an important role in the formation of the deposit. |
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| Keywords: | CO2 fluid CH4-bearing fluid fluid inclusion immiscibility Zimudang gold deposit |
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