豫西黄柏沟铀矿含矿与不含矿黑云母伟晶岩差异性研究  

A Study on Differences Between Uranium-bearing and Barren Biotite Pegmatites of the Huangbaigou Uranium Deposit in the Western Henan,China

作　　者：张盼盼 陈化凯 温国栋 阿丽莉 殷学文 王俊 代明月[2] 陈忠岳 刘晔 齐勇 ZHANG Pan-pan;CHEN Hua-kai;WEN Guo-dong;A Li-li;YIN Xue-wen;WANG Jun;DAI Ming-yue;CHEN Zhong-yue;LIU Ye;QI Yong(Henan Provincial Bureau of Nuclear Industry Geology,Zhengzhou 450044,China;School of Resources and Environment,Henan Polytechnic University,Jiaozuo Henan 454000,China)

机构地区：[1]河南省核工业地质局,郑州450044 [2]河南理工大学资源环境学院,河南焦作454000

出　　处：《矿物岩石地球化学通报》2022年第4期801-813,共13页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(41872111,41902115);中国地质调查局天津地质调查中心项目(12120115014301,12120113075800);河南省核工业地质局局控科研项目(2019001)。

摘　　要：为指导豫西灰池子岩体外围铀矿下一步的整体勘查,对该区外围的黄柏沟铀矿含矿与不含矿黑云母伟晶岩进行了详细的野外地质调查及放射性、岩石学及地球化学分析研究。结果显示,该区铀矿主要产于黑云母伟晶岩脉上盘,含矿黑云母伟晶岩整体呈肉红色、富含黑云母、矿物颗粒粗大均匀、高放射性强度、Th/U<1、同化混染现象发育;具有高硅、富钾、富氟、铝过饱和、轻重稀土分异不明显,Th、Zr、Hf、Y、Pb、Mo富集,亏损Sr、As、Zn等特征。不含矿黑云母伟晶岩整体呈灰白色、成分及结构构造简单、与围岩接触关系清晰、低放射性、Th/U>1。通过对比研究表明,含矿黑云母伟晶岩可能与加里东晚期高度分异的灰池子岩体含铀残浆在上涌过程中与其上盘的峡河岩群片(麻)岩发生同化混染有关,二者的差异性主要受灰池子岩体晚期高度分异的伟晶岩岩浆和含铀岩浆与峡河群黑云斜长片(麻)岩的同化混染作用共同控制。In order to precisely distinguish the U-bearing and barren biotite pegmatites in the Huangbaigou uranium deposit in the western Henan and then to further guide the overall exploration of uranium resource in the periphery of Huichizi Pluton,a comprehensive and systematic study on the geological,radioactive,petrological and geochemical characteristics between uranium-bearing and barren biotite pegmatites in the Huangbaigou uranium deposit has been carried out in this paper.The results show that the uranium ores are mainly located in the upper wall of biotite pegmatite dykes,which are characterized with flesh red in color,rich in biotite,coarse sized and uniform grained minerals,high radioactive intensities,Th/U ratios<1,commonly developed assimilation and contamination phenomena,high contents of Si,K,and F,supersaturated Al,insignificant differentiation of LREE and HREE,enriched Th,Zr,Hf,Y,Pb and Mo,and depleted Sr,As and Zn.The barren biotite pegmatites are characterized with grayish white in color,simple composition,simple texture and structure,obvious contact to wallrocks,low radioactivity,and Th/U>1.Based on the comparative study,it is believed that the uranium-bearing biotite pegmatite of the deposit could be formed by the upwelled late Caledonian highly differentiated uranium-bearing residual magma,which was assimilated and contaminated by the schist and gneiss of the Xiahe Group on its upper wall,from magma chamber of the Huichizi pluton.The differences between uranium-bearing and barren pegmatites may be mainly controlled by the late highly differentiated pegmatite magma and U-bearing magma derived from magma chamber of the Huichizi pluton,and the assimilation and contamination of the biotite plagioclase schist and gnesis of the Xiahe group.

关 键 词：灰池子岩体 黑云母伟晶岩 铀矿 地质特征 豫西 

分 类 号：P619.14[天文地球—矿床学]