挥发份在夕卡岩型和斑岩型矿床形成中的作用  

Role of Volatile Components in Formation of Skarn and Porphyry Deposits

作　　者：芮宗瑶[1] 赵一鸣[1] 王龙生[1] 王义天[1] 

机构地区：[1]中国地质科学院矿产资源研究所,北京100037

出　　处：《矿床地质》2003年第2期141-148,共8页Mineral Deposits

摘　　要：通过总结多年来对夕卡岩型和斑岩型矿床的研究所获得的成果 ,作者认识到挥发相在这些矿床形成过程中的重要地位和意义。文章系统讨论了在花岗质岩浆中挥发相的形成和时空演化、挥发相的组成及其与硅酸盐熔融体的不相溶性 ,提供了挥发相在夕卡岩型和斑岩型矿床中存在的证据 ,提出挥发相对花岗质岩体顶部和邻近围岩的微细裂隙、爆破角砾岩、夕卡岩、碱质硅酸盐交代岩和富含挥发份矿物的形成 。The present paper deals with formation, composition, space_time evolution of volatile components and their incompatibility with silicate magma. In addition, evidence is provided for the presence of volatile phase in skarn and porphyry deposits. Volatile components are very important in such ore-forming processes of skarn and porphyry deposits as the development of fine fractures on the top of granite rock body and in the wall rocks, the formation of explosion_breccia, skarn, alkaline silicate altered rocks and volatile_rich minerals, and the migration and deposition of ore materials. The skarn and porphyry deposits are dominantly related to the high emplacement granitic bodies enriched in volatile components. The volatile components are sometimes separated from the silicate molten mass due to the retrograde boiling, resulting in the formation of the independent volatile phase. The thermal system takes shape in the Late evolution stage of the granitic magma, and the chemical differences between the thermal system and the silicate crystalline phase cause the replacement and ore deposition.

关 键 词：挥发份 夕卡岩型矿床 斑岩型矿床 花岗质岩浆 硅酸盐熔融体 地球化学 

分 类 号：P611[天文地球—矿床学]