下庄铀矿田保存因素研究  

STUDY ON PRESERVED-ORE FACTOR IN XIAZHUANG URANIUM ORE FIELD

作　　者：张万良 

机构地区：[1]核工业270研究所,江西南昌330200

出　　处：《地质力学学报》2013年第2期152-161,187,共11页Journal of Geomechanics

摘　　要：下庄矿田是我国落实的第一个花岗岩型铀矿田,矿床和矿点分布在贵东岩体的东部,受构造、岩性联合控制,矿化类型有硅化带型(群脉型)、交点型、蚀变碎裂岩型和花岗岩外接触带变质砂岩型,矿床形成后经历了华南地壳的新生代特别是晚新生代的隆升和剥露。成矿后的构造活动研究表明,上洞断裂和马屎山断裂是矿田的保矿构造,它们形成时代较新,联合控制了下庄断块的下陷,保护了之前形成的铀矿免受或少受侵蚀破坏,这也是贵东岩体东部有矿西部无矿的根本所在。Xiazhuang ore field is the first granite-type uranium ore field found in China,where the deposits and occurrences located in the eastern part of Guidong grante,controlled by structure and lithology.About uranium mineralization type,there are silicified zone type（group vein）,intersection type,altered cataclastic rock type and metamorphic sandstone of the outer contact zone of granite.It had experienced the uplifting and exhumating of the crust in the South China during the Cenozoic,specially the late Cenozoic Era after the ore deposits formed.Data integration and field investigation shows that the Shangdong and horse feces Mountain fault are the protection-ore ones.The forming time is newer.The two faults which have together controlled Xiazhuang fault block undercutting,protect the uranium mine not or less being corroded and exhausted.This is why there is ore existing in the east part but not in west of Guidong granite.

关 键 词：贵东岩体 保矿构造 下庄断块 下庄铀矿田 

分 类 号：P619.14[天文地球—矿床学]