摘要
黄沙铀矿区主要矿床受EW向黄沙断陷带控制。野外断层调查和ESR测年表明,控制断陷带的黄沙和上竹坑断层的断层泥ESR年龄分别为21.28±2.0Ma和22.42±2.2Ma,断层错移活动主要发生于喜马拉雅运动第二幕,黄沙断陷带是新构造期形成的矿后断陷带,它们没有控制铀矿床的形成过程,但由于在不断隆升剥露的新构造背景下,断陷带不断下陷而受到的侵蚀剥露程度较低,故其中矿体可以得到较好的保存。
Major deposits in Huangsha uranium mining area are controlled by EW-trending Huangsha fault de- pression belt. Results of field fault investigation and ESR dating test suggested that the fault gouge in Huan- gsha fault and Shangzhukeng fault had control over the depression belt, and the ESR age of them were 21.28 ±2.0Ma and 22.42±2.2Ma respectively, and the dislocation activities of faults mainly occurred in the sec- ond phase of Himalayan movement. Huangsha fault depression belt is a post-mineralization fault depression belt which is formed in neotectonic period, and they have no control over the formation process of uranium deposit. However, under the neotectonic background of uplifting and exhumation, the fault depression belt constantly caves in but suffers little influence of erosion and exhumation, and thus the orebodies inside are well preserved.
出处
《矿产与地质》
2016年第5期746-751,共6页
Mineral Resources and Geology
基金
中国核工业地质局生产中科研项目"赣南龙源坝
陂头岩体构造及其与铀成矿关系研究"(编号:201473)
关键词
断陷带
边界断层
新构造运动
矿床保存
黄沙铀矿区
fault depression belt, boundary fault, neoteetonic movement, deposit preservation, Huangsha u-ranium mining area
