摘要
林旺金矿床是滇黔桂地区典型的复合型金矿床之一,具有层位控矿和断裂控矿的双重特点,为揭示矿床成矿流体的性质和来源,对两类矿体中主成矿阶段的石英进行了流体包裹体岩相学观察、显微测温和氢氧同位素测试分析。结果表明:两类矿体中的石英流体包裹体以水溶液包裹体为主,其次是CO2-H2O包裹体,水溶液包裹体的均一温度范围为134℃~394℃,盐度w(NaCl eqv)范围为1.05%~10.98%,密度范围为0.79~0.94 g/cm^3。石英中流体包裹体水的δD H 2 O范围为-71‰^-57‰,石英的δ^18O V-SMOW范围为21.7‰~26.5‰,计算得到流体的δ^18O H 2O范围为11.7‰~16.5‰,表明成矿流体来源于混合的变质水。成矿流体总体属于中低温、低盐度、中低密度的流体,具有的典型卡林型金矿床的成矿流体特征。
The Linwang gold deposit is located in the east-central of Youjiang basin,which is a typical compplex genesis gold deposit in the Dian-Qian-Gui Region.The orebodies are characterized by strata-controlling and fault-controlling specialities.Petrography observation,microthermometry of fluid inclusions in quartz from two type orebodies,and hydrogen and oxygen isotopic test of quartz are carried out in order to reveal the nature and original source of ore-forming fluids.The result shows that the fluid inclusions in quartz from two types orebody are mainly aqueous inclusion type,secondarily followed by CO2-H2O inclusions.The homogenization temperature values of aqueous inclusions are from 134℃ to 394℃,with a salinity range from 1.05 to 10.98wt% NaCl eqv,and a density range from 0.79 to 0.94 g/cm 3.δD H2O values of fluid inclusions in quartz are from-71‰ to-57‰,δ^18O V-SMOW values of quartz are from 21.7‰ to 26.5‰,and δ^18 O H2O values are from 11.7‰ to 16.5‰.It is indicated that the ore-forming fluid is derived from the mixed metamorphic water.The ore-forming fluid belongs to the medium and low temperature,low salinity and low density fluid,which has the typical characteristics of ore-forming fluid of Carlin-type gold deposit.
作者
罗薇
梁官华
谢贤洋
马克忠
LUO Wei;LIANG Guanhua;XIE Xianyang;MA Kezhong(Remote Sensing Center of Guangxi,Nanning 530023,Guangxi,China;Guangxi Bureau of Geology and Mineral Prospecting and Exploitation,Nanning 530023,Guangxi,China;MLR Key Laboratory of Metallogeny and Mineral Assessment(Ministry of Natural Resources),Institute of Mineral Resources,CAGS,Beijing 100037,China)
出处
《矿产与地质》
2019年第4期606-612,共7页
Mineral Resources and Geology
基金
国家重点基础研究发展计划973课题（2014CB440902）
国家自然科学基金面上资助项目（41572072）共同资助
关键词
林旺金矿
流体包裹体
氢氧同位素
成矿流体
卡林型金矿
右江盆地
Linwang gold deposit
fluid inclusion
Hydrogen and oxygen isotope
ore-forming fluid
Carlin-type gold deposit
Youjiang Basin
