STUDY ON PRESERVED-ORE FACTOR IN XIAZHUANG URANIUM ORE FIELD
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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。Abstract: 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.
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图 1 贵东复式花岗岩体位置及地质略图[7]
1—英安斑岩；2—细粒二云母花岗岩；3—中粗粒黑云母花岗岩；4—粗粒似斑状黑云母花岗岩；5—中粒似斑状二云母花岗岩；6—中粒似斑状黑云母花岗岩；7—中粗粒似斑状黑云母花岗岩；8—中细粒黑云母花岗岩；9—断层；10—不整合界线；11—岩体名称及编号（① 长坪岩体，② 寨头岩体，③ 宝林山岩体，④ 热水岩体，⑤ 隘子岩体，⑥ 下庄岩体，⑦ 司前岩体，⑧ 高栋岩体，⑨ 鲁溪岩体，⑩ 帽峰岩体）
Figure 1. Asketch geological map of the Guidong composite granite bodies
图 2 上洞断裂剖面素描图
1—燕山早期中粒斑状黑云母花岗岩；2—花岗质碎裂岩（裂隙发育带）；3—棕红色构造泥；4—破碎带
Figure 2. Section sketch of the Shangdong fault
图 4 马屎山断裂剖面示意图[18]
1—上白垩统紫红色砂砾岩；2—马屎山断裂及运动方向；3—印支期片麻状花岗闪长岩
Figure 4. Section sketch map of Horse Feces Mountain fault
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