CAJ | 학술논문

牧护关岩体西部的二长花岗岩赋存着北秦岭最著名的花岗岩型铀矿田———蓝田铀矿田。笔者对该花岗岩开展了系统的元素地球化学研究,其结果显示牧护关二长花岗岩为富硅、富钾、富碱和高分异过铝质花岗岩；微量元素特征是花岗岩相对于原始地幔具有富集大离子元素 Rb、U、La、Nd、Sm,亏损 Ba、Sr、P、Ti 等特征；稀土元素分配模式为轻稀土富集的右倾型。铀矿石与二长花岗岩具有相似的稀土元素特征,暗示铀矿床的成矿物质可能主要来源于二长花岗岩。尽管牧护关二长花岗岩的 U 含量远低于一般产铀岩体,但铀在其中主要以活性的晶质铀矿形式存在,也能被活化迁移继而成矿。晶质铀矿形式存在的铀可能在花岗岩铀成矿中起着更重要的作用。
목호관암체서부적이장화강암부존착북진령최저명적화강암형유광전———람전유광전。필자대해화강암개전료계통적원소지구화학연구,기결과현시목호관이장화강암위부규、부갑、부감화고분이과려질화강암；미량원소특정시화강암상대우원시지만구유부집대리자원소 Rb、U、La、Nd、Sm,우손 Ba、Sr、P、Ti 등특정；희토원소분배모식위경희토부집적우경형。유광석여이장화강암구유상사적희토원소특정,암시유광상적성광물질가능주요래원우이장화강암。진관목호관이장화강암적 U 함량원저우일반산유암체,단유재기중주요이활성적정질유광형식존재,야능피활화천이계이성광。정질유광형식존재적유가능재화강암유성광중기착경중요적작용。
Lantian uranium ore field,as the most famous granitic-type uranium ore field in the north Qinling area,lies in the monzogranite of west Muhuguan granitic pluton.Systematic ele-ment geochemistry studies were carried out on the Muhuguan monzogranite by the authors.The results show that the Muhuguan monzogranite is highly rich in silicon,potassium,alkaline and differentiation peraluminous.In terms of trace elements,granite is richer in LILE such as Rb, U,La,Nd,Sm and deficient in Ba,Sr,P,Ti compared with primitive mantle.The distribution pattern of rare earth elements are rightward oblique with LREE enrichment.The uranium ore has similar REE characteristics with the monzogranite,suggesting that metallogenic material of the uranium deposit might come from the monzonitic granite.Although uranium content of the Mu-huguan monzogranite is much lower than that of the general uranium-bearing granitic pluton,u-ranium existsin Muhuguan monzogranite in the form of active uraninite,which can be activated to migrate and then mineralize.Uranium,which exists in the form of uraninite,may play a more important role in the mineralization of granitic-type uranium deposits.