摘要
金家金矿床位于辽宁省凌海市,包括刘屯和金屯两个矿体,矿石类型主要为硫化物石英脉型。对采取地表、坑道及钻孔中的含金石英脉样品进行包裹体测温和成分分析,以研究矿床形成的物理化学条件。结果表明,成矿只有一期,成矿流体是含CO_(2)及Ca^(2+)、Na^(+)、Cl^(-)的NaCl-H_(2)O-CO_(2)体系。均一温度直方图呈单峰式,成矿温度平均为210℃,盐度为8.5%(NaCl),矿化度为38.35 g/L,密度为0.91 g/cm^(3),压力为79×10^(5)~262×10^(5) Pa,氧分压逸度为-70.36,pH值为6.12,氧化还原电位(Eh)为-0.37 V。包裹体成分中的阴离子主要为Cl^(-),金主要以氯的络合物形式被搬运迁移。综合认为金家金矿是在弱酸、还原环境形成的浅成中低温矿床。
Jinjia gold deposit is located in Linghai city of Liaoning province.Ore type of this deposit is mainly sulfide quartzvein type,including Liutun orebody and Jintun orebody.Inclusions in samples of gold bearing quartz vein from the surface,tunnel and drill hole are analyzed to study the metallogenic physicochemical conditions.The results show that there is only one metallogenic period.Ore-forming fluid is a NaCl-H_(2)O-CO_(2) system and riches in CO_(2),Ca^(2+),Na^(+)and Cl^(-).Histogram of homogenization temperature of inclusions is unimodal type.The ore-forming temperature is 210℃,salinity is 8.5%(NaCl),degree of mineralization is 38.35 g/L,density is 0.91 g/cm^(3),pressure is 79×10^(5)~262×10^(5) Pa,the fO2 is-70.36,pH value is 6.12,and Eh is-0.37 V.The anions in ore-forming fluid is chiefly Cl^(-)and the gold is transfered and migrated in the form of chlorine complex.Comprehensive analysis reveals that Jinjia gold deposit is a hypergene medium-low temperature deposit formed in weak acid and reduced environment.
作者
李占春
李国宽
张振强
LI Zhan-chun;LI Guo-kuan;ZHANG Zhen-qiang(Geological Party No. 243,CNNC, Chifeng 024000,China;Research Institute 240 of Nuclear Industry, Shenyang 110032,China)
出处
《东华理工大学学报(自然科学版)》
CAS
2021年第3期260-266,共7页
Journal of East China University of Technology(Natural Science)
基金
中国核工业地质局项目(201801)。
关键词
硫化物石英脉型
流体包裹体
物理化学条件
中低温矿床
金家金矿
凌海市
sulfide quartz-vein type
fluid inclusion
metallogenic physicochemical conditions
medium and low temperature deposit
Jinjia gold deposit
Linghai city