东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

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

ISSN号：1000-4734
期刊名称：矿物学报
时间：2012.6.6
页码：211-220
分类：P579[天文地球—矿物学;天文地球—地质学] P599[天文地球—地球化学;天文地球—地质学]
作者机构：[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
相关基金：国家自然科学基金项目（批准号：40930423;40873036）;国家重点基础研究发展计划（2009CB421003-01）;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（B07011）
相关项目：沉积盆地中金属成矿与油气成藏关系研究—以右江、兰坪盆地为例

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, CO2 fluid, CH4-bearing fluid, fluid inclusion, immiscibility, Zimudang gold deposit

中文摘要：

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。

英文摘要：

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. Ma- jor 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 22 , 0.35% - 7.45% of SAC1, and 0. 745 - 0. 969 g/cm^3, respectively, while those of the late stage （ Ⅲ） vary in the ranges of 100 - 18022 , 0. 18% - 5.71% NaC1, and 0. 868 - 0. 993 g/cm^3, respectively. The ore-forming fluids were characterized by a H2O-NaC1-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.

同期刊论文项目