广东省梅县嵩溪银锑矿地质特征及成因探讨

Investigation on the form reason and geological characteristics of the Silver-Antimony ore in Songxi of Meixian in Guangdong Province

根据嵩溪银锑矿V2、V4、V5、V6号矿脉的产状、形态和矿化特征,分析了矿体沉积环境,控矿构造,成矿物质来源等因素,探讨了矿床的成因;初步认为早侏罗系海底安山玄武岩熔浆,沿寨岗上盆地边缘扩张性断裂上涌,在喷溢过程中,大量含Fe、Ag、Sb及多金属元素从喷口溢在富含有机质的局限-半局限海盆中沉积,形成矿源层或矿胚层。由于海盆中不断地接受上涌基性熔浆,在带来新的矿质来源的同时,含矿热水溶液流经含矿层间破碎裂隙,促使矿源层或矿胚层中矿化组分活化、迁移,在有利的物理化学和构造条件下沉淀富集成矿。其矿床成因应属海底火山喷流沉积-热液改造型矿床。

This paper studies the occurrence, shape and mineralization characteristics of the Silver - Antimony ore （including numbers of V2, V4, V5, V6 ） in Songxi, Meixian County, Guangdong Province. Based on these studied results, the environment of sedimentation, the ore - controlling structures and the source of minerals have been also studied. Correspondingly, a conclusion has been made that in the Early Jurassic, the submarine basalt erupted along the edge of the Cai Hill basin periodically, and during the process of eruption a large number of remnant gas and liquid overflowed from the vents into the confined - to semiconfined -basin where rich in organic matter. These erupted gas and liquid rich in Fe, Ag, Sb and other kinds of metal elements, deposited with the terrestrial clasts and the intrinsic clasts, and then formed the mine - source layer and mine - mesoderm layer. With the basic melts continued to flow, the hot ore - bearing aqueous solution flowed through the fissures of layers that containing mine and led the source of ore or ore mineralization embryo layer component to be migrated. The Silver - Antimony ore thereafter formed when the physical and chemical situation became proper.