华阳川铀多金属矿床铀成矿地质特征

Geological Features of Uranium Metallization in the Huayangchuan U-Polymetallic Deposit

华阳川铀多金属矿床位于华北板块与秦岭造山带接触的小秦岭地区,该矿床的成矿类型极具独特性,在国内外尚未发现该类型的如此大规模的铀多金属矿床。该矿床具有多矿种、大矿量、潜力大的特点。该矿床的地质科研工作程度较低。通过综合分析前人研究成果的基础上,结合野外地质特征,探明了该矿床的含矿主岩为伟晶岩及碳酸岩脉;与矿化密切相关的主要热液蚀变类型为霓辉石化、微斜长石化、阳起石化和黑云母化;铀矿化类型可分为含铀黑云母化(或阳起石化)伟晶岩脉型、含铀钾化伟晶岩脉型、含铀霓辉石(或黑云母、阳起石)方解石石英脉型和含铀片麻状花岗岩型;铀在矿石中的赋存形式主要为铌钛铀矿、晶质铀矿、沥青铀矿和铀钍石。

The Huayangchuan U-polymetallic deposit lies in the Xiaoqinling gold deposit cluster area between the North China plate and the Qinling orogenic belt.This deposit type has not been found at home and abroad.The deposit is hosted in pegmatite and carbonate dykes.Main wallrock alteration types are aegirine-augitization,microclinization,actinolitization and biotitization.Uranium mineralization may be divided into 4 types such as uranium-bearing biotitizated(or actinolitizated)pegmatite dyke type,uranium-bearing potassium feldspathizated pegmatite dyke type,uranium-bearing aegirine-augite(or biotite-actinolite)calcite-quartz vein type and uranium-bearing gneissic grante type.The uranium minerals are betafite,uraninite,pitchblende and uranothorite.