赣杭带中段天台山火山盆地铀矿控矿因素及找矿方向

天台山火山盆地位于华南板块与扬子板块接壤部位,处在赣杭铀成矿带中段北缘,已探明 5 个铀矿点以 及 9 个铀矿化点,矿化类型较多,控矿因素复杂,制约了下一步找矿。 结合该盆地地质特征、铀矿化特征调查成果,分 析了铀矿控矿因素,为下一步找矿提供方向。 结果表明:①铀矿化主要受岩层、岩体、断裂、火山机构以及层间破碎带 等控制,下白垩统火山岩、前寒武系变质岩以及花岗闪长岩是主要赋矿岩层;NE 向、近 EW 向断裂是导矿断裂,NE 向 断裂控制了盆地北部铀矿化展布,近 EW 向断裂控制了南部铀矿化;火山机构、层间破碎带是主要控矿构造。 ②盆地 南部沿着 F1 断裂追索寻找铀矿化信息,在天台山火山机构深部寻找隐爆角砾岩型、次火山岩亚型铀矿化。 ③盆地北 部沿着 F4、F5 断裂寻找碳硅泥岩型铀矿化,加强姜家、王石山岗火山机构深部构造特征研究,探索次火山岩亚型、隐爆 角砾岩亚型铀矿化;④加强花岗闪长岩深部侵入形态特征研究,岩体侵入界面与 NE 向断裂交汇部位是寻找花岗岩型 铀矿的重点部位。

Ore-controlling Factors and Prospecting Direction of Uranium Deposit in Tiantaishan Volcanic Basin,Middle Gan-Hang Belt

The tiantaishan volcanic basin which is located in the border between the Yangtze plate and South China plate,also is situated in the North of the middle Gan-Hang uranium metallogenic belt.5 uranium points,9 uranium mineralization points was found in the basin.There are several mineralization types and complex ore-controlling factors,which have restricted the further prospecting.In this paper,the uranium ore-controlling factors are studied by analyzing the geologic feature and uranium mineralization of the volcanic basin,so as to provide the direction for further geological prospecting.The results show that:①Uranium mineralization are controlled by the terrane,pluton,fault,volcanic structure and interlayer fracture zone.Volcanic rock of early Cretaceous age,Precambrian metamorphic rocks and granodiorite are the main ore-bearing horizon.NEtrending fault and nearly EW-trending fault are the major structure as passageway for ore fluid.Uranium mineralization in the north basin are yielded along NE-trending fault.Uranium mineralization in the south basin are yielded along nearly EW-trending fault.Volcanic edifice and interlayer fracture zone are the main ore-controlling structure.②Mineralization information is explored along F1 fault in the south basin,cryptoexplosion breccia type and subvol canic type U-ore is prospected in the deep part of Tiantaishan volcanic edifice.③Carbonate-siliceous-pelitic rock type U-ore is explored along F4 and F5 fault in the north basin.Cryptoexplosion breccia type and subvol canic type U-ore is prospected by studying the deep structural feature of Jiangjia and Wangshishangang volcanic edifice.④The deep intrusion morphological characteristics of granodiorite should be strengthened.The key prospecting area for granite type U-ore is the intersection parts between rock intrusion interface and NE-trending fault.