鄂西东岳中低温热液充填型大理石矿床的地质特征  

GEOLOGICAL CHARACTERISTICS OF THE MESOTHERMAL EPITHERMAL MARBLE DEPOSIT IN DONGYUE, WEST HUBEI

作　　者：赵来时[1] 朱明[1] 吴立 杨世忠 

机构地区：[1]中国地质大学

出　　处：《矿床地质》1999年第3期235-243,共9页Mineral Deposits

基　　金：湖北省科委重点攻关项目

摘　　要：通过对东岳大理石矿的地质特征、矿石化学成分、微量元素、矿物包裹体及同位素地球化学研究，认为该矿属于中低温热液充填矿床，成矿温度１４０～２２０℃，成矿溶液来源于大气降水。这类矿床是我国大理石矿新类型，对鄂西、河南。On the basis of an analysis of tectonic and geological background, ore structure and ore type of the Dongyue marble deposit, the authors systematically studied chemical composition, trace elements, homogenization temperature and salinity of fluid inclusions in calcite as well as chemical composition and characteristics of carbon, hydrogen and oxygen isotopes of the ore forming fluid. The results show that the ore forming temperatures of the marble deposit are 140～220℃, the salinity for mineralization is 6 1%～7%, the density of the ore forming fluid is 0 88～0 98% g/cm 3, the mineralization is of the Ca 2+ (Mg 2+ ) F -(Cl -) SO 2- 4(HCO - 3)type, the ore fluid belongs to intermediate to weakly sodic solution with reducing character. The ore forming fluid was mainly derived from meteoric water and subordinately from surrounding rocks. It is concluded that the deposit is a mesothermal epithermal marble deposit. Being a new type of marble deposit in China, it is of great significance to the genetic study of the same type of deposits in western Hubei, Henan and Guangxi.

关 键 词：中低温热液 大理石矿床 同位素地球化学 液包体 

分 类 号：P619.223[天文地球—矿床学]