摘要
凡是从事矿床成因研究的学者都会认为,不同成因类型矿床成矿溶液的性质是不同的。作为重要成矿溶液之一的水化学性质也必然存在着差异,这种差异性对指示矿床成因具有重要意义。矿物中的流体包裹体是保留下来的成矿溶液的微体样品,其溶液的水化学性质可以代表成矿溶液的水化学特征。当我们知道了流体溶液的水化学性质之后。
Viewed from its geological conditions,the oreforming solution is a component of ground water,which decides that the study on hydrochemical property of solution of fluid inclusions of minerals has to penetrate the field of hydrogeology.On the basis of hydrochemical property of modern groundwater and in comparison with the solution of fluid inclusions,the hydrochemistry can provide the direct evidence for determining the type of ore-forming solution.The hydrochemical properties of inclusion solution of different types of deposits are obviously different,the solution property of inclusions of groundwater type ore deposits is closely related to the composition of ore-hosting country rocks.Inclusions of sandstone-shale area ore characterized by low ion concentration,Low salinity and low mineralization degree. Karst type inclusions show high Ca^(2+),Mg^(2+)and HCO_3^-ions concentration.Saline type inclusions are dominated by Ca^(2+),and SO_4~2 ions.Sea water and brine type inclusions are predominatingly Na^+,Ca^(2+)and Cl^- ions,but brine type inclusion is higher than marine type inclusion in ion concentration,salinity and mineralization degree.The inclusions solution of typical magmatic hydrothemal series ore deposits are characterized by F-K type water as well as low concentration,low salinity and low mineralization degree.The inclusions of hydrothermal ore deposits are changed their hydrochemical property due to the influence of composition of country rocks.The inclusions of metamorphic type ore deposits reveal complicated ion composition,high ion concentration,middle high salinity and high mineralization degree.The inclusions of porphyry type ore deposits are greatly affected by country rocks and show that was violent metasomatism in mineralization.All these differences can be fully used to decide the type of ore-forming solution.
出处
《广西地质》
1996年第1期33-54,78+33-53,共22页
Guangxi Geology
关键词
矿物
液包体
水化学
成因
ground water
inclusion solution
penetrate
salinity
mineralization degree.
