相山铀矿田成矿构造系统及找矿方向探讨

Discussion of Metallogenic Tectonic System of Xiangshan Uranium Ore Field

相山铀矿田是我国著名的大型火山岩型热液铀矿田。近年来,断裂构造对铀矿的控制作用得到越来越多的认同。本文在前人研究的基础上,依据成矿构造系统的概念,通过划分构造系统类型、研究各构造系统与铀成矿的时空关系和成因联系,厘定了相山矿田铀成矿构造系统。矿田构造系统可划分为陆相火山构造系统、区域应力断裂构造系统和陆相沉积构造系统。陆相火山构造系统为矿前构造系统,沉积构造系统与区域应力断裂构造系统近同步发育。区域应力断裂构造系统及其与火山构造系统复合控制了铀矿的空间定位。区域应力断裂构造系统与铀成矿具有密切的时间、空间和成因联系,为成矿构造系统。区域应力断裂构造系统及其与陆相火山构造系统复合区域为相山矿田主要找矿方向,区域应力断裂构造系统内部的火山岩盖层断裂构造与基底构造复合区域、区域应力断裂构造系统与沉积构造系统复合区域为值得进一步探索的方向。

Xiangshan uranium ore field is a famous large volcano rock type hydrothermal uranium ore field in China. In recent years,the control effect of fracture structure on uranium deposits has been more and more recognized. In this paper,on the basis of previous studies,according to the concept of metallogenic tectonic system,the metallogenic tectonic system of Xiangshan uranium ore field was determined,based on the division of tectonic system type and the time-space relationship and genetic relations between each tectonic system and uranium mineralization. The structure system of the ore field can be divided into continental volcanic tectonic system,regional stress fracture structure system and continental sedimentary structure system. The continental volcanic tectonic system is the pre-ore structure system,and the sedimentary tectonic system and the regional stress fracture structure system are closely synchronized. The regional stress fracture structure system and the volcanic tectonic system control the space location of uranium ore. The regional stress fracture tectonic system is closely related to time,space and genesis with uranium mineralization,and determined as a metallogenic structural system. The regional stress fracture tectonic system and its superposition with the continental volcanic tectonic system is the main exploration direction of Xiangshan orefield,the composite area of the volcano caprock fracture structure and basement structure inside the regional stress fracture system,the composite area of the regional stress fracture tectonic system and sedimentary tectonic system are worthy of further exploration direction.