陕西凤县铅洞山铅锌矿床的矿石组构成因意义的分析

本矿床的矿石组构类型可概括为四类:同生沉积组构、成岩组构、后生叠加组构和后期变形改造组构。详细研究表明,以同生沉积和成岩作用形成的组构为主,如浸染状、层纹状、条带状、角砾状构造和莓球状、半自形细粒状结构等,其中部分受到后期构造变形改造、但后生成矿组构极为少见。矿床的地球化学特征研究提供了成矿物质来源于深部地层的信息。因此,从矿石组构特征及成矿物质来源两个方面分析,认为本矿床为海底喷流沉积—成岩弱改造型层控矿床.

THE ORE FABRIC AND ITS GENETIC SIGNIFICANCE OF THE QIANDONGSHAN LEAD-ZINC DEPOSITS IN FENGXIAN COUNTY, SHAANXI PROVINCE

Many types of ore fabric have been recognized in the Qiandongshan Le-adzinc deposits, and they can be summarized into the following four genetic types; the syngenetic, the diagentic,the epigenetic and the deformation fabrics.An exhaustive study shows that the epigenetic as well as the diagenetic fabrics are predominant.The later both include a lot of structures or textures, such as disseminated, laminated, striped brecciated framboidal, hypidiomorphic finegranular, a part of which can be transformed by the superimposition of late tectonic deformation. The geochemistry of the ore deposit supplies some evidences to indicate that the ore-forming materials are hypogenic.Therefore, it is a reasonable inference that the ore deposit is a submarine exhalative sedimentation-diagenesis strata-bounded deposit transformed weakly,as a result of an analysis of the ore fabric and the source of ore-forming materials.