| 贵州太平洞金矿床流体包裹体特征及流体不混溶机制 |
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| 引用本文： | 刘丽,顾雪祥,彭义伟,章永梅,吴成赟,程文斌.贵州太平洞金矿床流体包裹体特征及流体不混溶机制[J].岩石学报,2012,28(5):1568-1576. |
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| 作者姓名： | 刘丽 顾雪祥 彭义伟 章永梅 吴成赟 程文斌 |
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| 作者单位： | 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 |
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| 基金项目： | 本文受国家重点基础研究发展计划"973"项目(2009CB421003)、国家自然科学基金项目(40930423、40873036)和高等学校学科创新引智计划(B07011)联合资助. |
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| 摘 要： | 太平洞金矿床是兴仁-安龙金矿带灰家堡金矿区的重要卡林型金矿之一。流体包裹体研究证明,石英-黄铁矿阶段(Ⅰ)、石英-黄铁矿-毒砂阶段(Ⅱ)、石英-方解石-雄黄阶段(Ⅲ)的包裹体类型丰富,以气液水两相包裹体、CO2-H2O包裹体和纯液相水包裹体为主,CO2两相包裹体、纯气相有机质包裹体和有机质-H2O包裹体次之,偶见气液有机质包裹体。由Ⅰ→Ⅱ→Ⅲ阶段,气液水包裹体均一温度(200～260℃→180～240℃→100～160℃)呈现逐渐降低的趋势。在Ⅰ阶段的石英中,只在局部偶见到CO2-H2O包裹体和气液两相水包裹体共生;在Ⅱ阶段的石英中,纯液相水包裹体、气液两相盐水包裹体、CO2-H2O包裹体、CO2包裹体及纯气相有机质包裹体共存,它们共生在同一平面中且气液两相盐水包裹体和CO2-H2O包裹体测温数据相差不大,说明当时捕获的是不均匀成矿流体,它是由含有机质的成矿流体经历了CO2-低盐度水的不混溶作用形成的。因而认为,太平洞金矿床中成矿早期流体不混溶作用不明显,主成矿阶段流体的不混溶作用是导致金矿质沉淀的重要原因。
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| 关 键 词： | 流体不混溶 流体包裹体 成矿流体 太平洞金矿床 |
| 收稿时间： | 4/3/2011 12:00:00 AM |
| 修稿时间： | 7/8/2011 12:00:00 AM |
Characteristics of fluid inclusions and fluid immiscibility mechanism of the Taipingdong gold deposit, Guizhou |
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| LIU Li,GU XueXiang,PENG YiWei,ZHANG YongMei,WU ChengYun and CHENG WenBin.Characteristics of fluid inclusions and fluid immiscibility mechanism of the Taipingdong gold deposit, Guizhou[J].Acta Petrologica Sinica,2012,28(5):1568-1576. |
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| Authors: | LIU Li GU XueXiang PENG YiWei ZHANG YongMei WU ChengYun and CHENG WenBin |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The Taipingdong gold deposit lies in the Xingren-Anlong gold belt of the Huijiabao gold district.The research on fluid inclusions indicates that various types of fluid inclusions are formed in quartz-pyrite(stageⅠ),quartz-pyrite-arsenopyrite(stage Ⅱ) and quartz-calcite-realgar(stage Ⅲ),which include mainly liquid-rich two-phase inclusions,CO2 inclusions,mono-phase aqueous inclusions and CO2-H2O inclusions,subordinately mono-phase organic vapor inclusions,and minor liquid-vapor organic inclusions are present in minerals of different stages.The homogenization temperature of the aqueous fluid inclusions decreases from stageⅠ(200 ～ 260℃),through stageⅡ(180 ～ 240℃) to Ⅲ(100 ～ 160℃).In quartz of stageⅠ,CO2-H2O inclusions occasionally coexist with twophase aqueous inclusions locally.The coexistence of two-phase aqueous inclusions with simultaneously trapped CO2 inclusions,monophase aqueous inclusions and CO2-H2O inclusions,mono-phase organic vapor inclusions and liquid-vapor organic inclusions in quartz of stage Ⅱ and the similar homogenization of two-phase aqueous and CO2-H2O inclusions suggests that the ore-forming fluid experienced fluid immiscibility between CO2 and low-salinity water.This indicates that fluid immiscibility extensively took place at later stage.The immiscibility of ore-forming fluids between CO2 and low-salinity water caused Au mineralization in the Tai pingdong gold deposit during the main mineralization stage. |
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| Keywords: | Fluid immiscibility Fluid inclusion Ore-forming fluids The Taipingdong gold deposit |
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