摘要
内蒙古林西县大井铜多金属矿是大兴安岭中南段的重要矿床。流体包裹体研究表明,在铜矿化阶段,大井矿段的平均均一温度为179℃,高于通和矿段的170℃和利拓矿段的153℃;大井矿段的平均盐度为11.20%(NaCleqv.),也高于通和矿段的9.2%(NaCleqv.)和利拓矿段的10.0%(NaCleqv.)。铜矿化阶段的均一温度平均值为177℃,高于铅锌矿化阶段的144℃;但铜矿化阶段的盐度平均值为10.53%(NaCleqv.)、密度平均值为0.97g/cm^3,却低于铅锌矿化阶段的盐度平均值13.81%(NaCleqv.)和密度平均值1.02g/cm^3。铜矿化流体和铅锌矿化流体不是同一成矿流体的连续演化,而是两个不同的成矿流体。大井矿床的成矿作用过程大致是:锡、铜的成矿流体先侵位卸载成矿,晚些时候铅锌的成矿流体也叠加进来,但是铅锌矿化中心与锡、铜的矿化中心并不完全重叠,只是部分矿体在空间上有叠加。不同期次流体的叠加成矿是大井矿床的Cu、Pb-Zn、Sn、Ag均达到大型规模的最重要因素。
The Dajing Cu polymetallic deposit,located in Linxi County,Inner Mongolia,is an important deposit in middle- southern Great Hing'an Range.Results on fluid inclusion indicates that during the Cu- forming process,the average homogenization temperature and salinity in the Cu- rich ore block are 179℃ and 11.2% NaCleqv.,higher than 170℃ and 9.2%NaCleqv.of Tonghe ore block,153℃ and 10.0% NaCleqv..of Lituo ore block, where Cu ore is both less densely distributed.During the Cu- forming process,the average homogenization temperature is 177℃,higher than 144℃ of the Pb- Zn forming process;but salinity and density are 10.53% NaCleqv.and 0.97 g/cm^3,lower than 13.81%NaCleqv.and 1.02 g/cm^3 of the Pb-Zn forming process.Cu ore-forming fluid and Pb-Zn ore-forming fluid in Dajing Cu polymetallic deposit are independent from each other and formed in same place,rather than evolved from one kind of metallogenic fluid source.In general,the mineralization process of Dajing Cu polymetallic deposit is as follow: Sn and Cu ore-forming fluids formed in the same place, after which Pb-Zn ore-forming fluid superimposed later,resulting in Cu,Pb-Zn,Sn,Ag reaching a large scale in Dajing.
作者
刘铭涛
陈向平
王居松
曹锦元
牛英杰
程绪江
左立波
LIU Ming-tao;CHEN Xiang-ping;WANG Ju-song;CAO Jin-yuan;NIU Ying-jie;CHENG Xu-jiang;ZUO Li-bo(Tianjin North China Geological Exploration Bureau,Tianjin 300170,China;Tianjin Institute of Geological Survey,Tianjin 300191,China;Tianjin Center,China Geological Survey,Tianjin 300170,China)
出处
《地质调查与研究》
2019年第3期194-201,共8页
Geological Survey and Research
基金
地方政府委托项目“赤峰市有色金属成矿规律研究”
关键词
铜多金属
流体包裹体
均一温度
盐度
不同成矿流体
叠加成矿
Cu polymetallic
fluid inclusion
homogenization temperature
salinity
various metallogenic fluids,superimposed mineralization
