赣南黄沙铀矿区上窖地段构造特征及深部找矿方向

上窖地段位于NE向桃山-诸广花岗岩型铀成矿带中段黄沙矿区的南部。近EW向F黄、F上断裂与NE向良伞寨断裂带构成该矿区基本构造格架,控制了良伞寨、上窖、鹅公塘三个铀矿床和多个矿(化)点的定位,显示优越的铀成矿地质背景。近几年在上窖地段实施的调查评价和预查工作,新发现了受近SN向F青断裂控制的青山铀矿点,丰富了"NE向断裂控矿和近SN向、NE向次级断裂容矿"的成矿规律。本文以前期找矿勘查成果为基础,结合前人资料,简述研究区铀成矿地质条件和矿化特征,浅析NE向断裂的控矿作用和近SN向断裂的容矿特征,探讨深部找矿方向,认为研究区南西部F青断裂发育延伸的地段是寻找受NE向断裂控制的赋存于近SN向F青断裂内铀矿化的有利地段,标高100m~350m是下一步钻探查证的重点找矿部位。

Structural characteristics of Shangjiao section and direction of deep prospecting in the Huangsha uranium mining area, southern Jiangxi Province

The Shangjiao section is located in the south of the Huangsha uranium mining area in the middle Taoshan-Zhuguang uranium metallogenic belt, Jiangxi Province. The nearly EW-trending Huangsha and Shangzhukeng faults and NE-trending Liangsanzhai fault control the distribution of the Liangsanzhai, Shangjiao and Egongtang deposits and many occurrences, indicating the area lies in a favorable geological environment of uranium mineralization. In recent years, uranium resource evaluation and reconnaissance have been carried out. The Qingshan occurrence which is controlled by nearly NS-trending fault has been found, which further confirms the metallogenic regularity that NE-trending faults control ore and nearly NS- and NE secondary faults host ore. On the basis of previous mineral exploration, this paper expounds the characteristics of uranium mineralization, metallogenic regularities, and ore controlling factors, and discusses ore controlling effect of NE faults and ore-hosting effect of nearly NS secondary fractures. It is suggested that the southwestern Shangjiao area with fault extension is the favorable place of mineralization, and the next drilling verification should be the locality with elevation 100 meter to 350 meter.