北秦岭丹凤地区许庄花岗岩体地球化学特征及铀成矿潜力分析  

Analysis on the Geochemical Characteristics and Uranium Resourcr Potential of Xuzhuang Granite in Danfeng Area,North Qinling Mountains

作　　者：赵友东 张良 王江波 武正乾 周伟 王凯 冯博 王奇辉 王芳芳 李树雷 ZHAO Youdong;ZHANG Liang;WANG Jiangbo;WU Zhengqian;ZHOU Wei;WANG Kai;FENG Bo;WANG Qihui;WANG Fangfang;LI Shulei(Research Institute No.203,CNNC,Xi’an,Shaanxi 710086,China;No.712 General Party Co.,Ltd.,Northwest Mining and Geology for Nonferrous Metals,Xianyang,Shaanxi 712000,China)

机构地区：[1]核工业二〇三研究所,陕西西安710086 [2]咸阳西北有色七一二总队有限公司,陕西咸阳712000

出　　处：《铀矿地质》2024年第4期695-707,共13页Uranium Geology

基　　金：陕西省自然科学基础研究计划(编号:2024JC-YBMS-235);中国地质调查局地质矿产调查项目(编号:DD2016013623);中国核工业地质局铀矿地质项目(编号:201621、202217、202314)联合资助。

摘　　要：北秦岭为我国重要的花岗岩型铀矿富集区,文章选取其中的许庄花岗岩体及其内部的麻岭洼铀矿点作为研究对象,通过许庄花岗岩地球化学及麻岭洼铀矿点成矿特征的研究,探讨了花岗岩铀成矿潜力。许庄岩体具有高Si,富K、Al,贫Ca、Mg等特点,富集大离子元素Rb、Th、U、K,明显亏损Sr、Ba、Nb、Ti和轻微亏损P、Eu,U含量高,铕负异常明显。麻岭洼铀矿点矿化主要产出于碎裂蚀变花岗岩中,具有明显的构造-蚀变控矿特征,是典型的内生热液成因。岩石类型(S型)及岩体较高的铀含量是铀成矿的有利因素,构造改造和热液蚀变作用叠加使铀富集成矿,结合丰富的地表铀异常信息,判断许庄岩体具有较好的铀成矿潜力。The North Qinling is an important granite type uranium deposit area in China.In this paper,Xuzhuang granite and the Malingwa uranium occurrences were selected as the research objects.The uranium metallogenic potential of granite was discussed through systematic study.Xuzhuang granite was found high in Si rich K,Al poor in Ca and Mg.The granite contains a small amount of muscovite,garnet and other minerals with strong aluminum,indicating a typical S-type granite with strong aluminum.The granite may be formed by the partial melting of a crustal mixing source area dominated by metamorphic greywacke and supplemented by argillaceous rocks,which are rich in the large ion elements Rb,Th,U and K,obvious depleted in Sr,Ba,Nb,Ti and slight depleted in P,and strong negative Eu anomaly.Malingwa uranium occurrences is located in the inner contact zone in the west of the pluton.Uranium mineralization is mainly produced in the lithoclastic altered granite,and the ores are highly developed in alteration,which have obvious structural and alteration control characteristics.The mineral assemblage of Malingwa uranium occurrences is of typical endogenetic hydrothermal origin.The favorable factors for uranium mineralization are the rock type(S type)and the high uranium content.Strong tectonic transformation,hydrothermal alteration and superimposed fluids action made the uranium deposited and enriched for mineralization.Combined with abundant surface uranium anomaly information,it was judged that Xuzhuang granite has a good uranium mineralization potential.

关 键 词：丹凤地区 许庄花岗岩体 地球化学特征 铀成矿潜力分析 

分 类 号：P619.14[天文地球—矿床学]