摘要
相山火山盆地西部已探明多个铀矿床,其中产于NE、NW向构造交接而成的菱形断块内的10个矿床均揭见南北向矿带。文章在阐述相山火山盆地铀成矿地质背景的基础上,研究了火山盆地西部SN向构造特征及其含矿性,结合区域应力场分析,认为白垩纪、尤其是早白垩世的NNE向区域主压应力作用,导致NE向构造左旋走滑、NW向构造右旋位移明显,由此形成西部菱形断块构造格局。与此同时,NE、NW向构造的共同走滑作用,使得SN向基底构造复活并贯通至盖层或形成新的SN向构造线。构造表现形式为破碎带或裂隙密集带,其构成了导矿构造的配套构造,成为相山火山盆地西部重要的含矿构造。
Some of uranium deposits have been found in west Xiangshan volcanic basin in a rhombic block interwoven by NE and NW striking faults, and 10 deposits contain NS striking orebodies. On basis of uranium metallogenic background of Xiangshan volcanic basin, characteristics and ore-bearing features of NS striking faults in west volcanic basin have been studied. According to the analysis of regional stress field, it is considered that prineipal regional compressive stress was NNE direction in Cretaceous, especially in early Cretaceous. NE striking fault slipped sinisterly and remarkably, NW striking fault displaced sinisterly, tectonic framework of rhombic block was formed in the west basin. Meanwhile, NW striking fault also slipped sinisterly, SN striking faults in the basement rejuvenated and perforated through the cover, or new SN striking fault was formed at sinister slipping of both NE and NW striking faults. Fractured zones or intensively fractured zones are the main forms, which are complement faults to conducting faults. These fractured zones or intensively fractured zones are important ore-bearing structures in the west Xian^shan volcanic basin.
出处
《铀矿地质》
CAS
CSCD
2013年第5期257-262,共6页
Uranium Geology
关键词
SN向构造
含矿性
形成机制
左旋走滑
火山盆地西部
SN striking structure
ore-bearing
formation mechanism
sinister slipping
west volcanic basin
