赣南银坑山铀矿点地球化学特征及其找矿意义

GEOCHEMICAL CHARACTERISTICS OF THE YINKENGSHANG ORE SPOT IN SOUTHERN JIANGXI PROVINCE AND THEIR ORE-PROSPECTING IMPLICATIONS

银坑山铀矿点位于赣南九龙嶂火山盆地南东边缘,矿体呈脉状,水云母化、赤铁矿化明显。与围岩相比,矿石的Al2O3、SiO2含量降低,Fe2O3(FeO)、MnO、CaO、S、Cl呈富集趋势,Mo、Ag、Th为主要伴生组分。从矿化蚀变组合特征看,银坑山矿点属岩浆热液型,且位于岩浆热液成矿系统的上部,深部具成矿前景。

The Yinkengshang uranium ore spot occurs on the southeastern margin of Jinlongzhang volcanic basin in southern Jiangxi Province, whose orebodies have been controlled. There exist obvious wall rock alterations such as hydromicatization and hematitization. Compared with those in the wall rocks, the Al 2O 3 and SiO 2 in the ores decrease evidently, but the Fe 2O 3 (FeO), MnO, CaO, S and Cl increase. Mo, Th and Ag are main associated elements, with the highest Mo content more than 1%. According to the mineralization-alteration assemblage features, it is considered that this ore spot belongs to the magmatic-hydrothermal ore-forming type located at the top of the magmatic-hydrothermal ore-forming system.