龙首山成矿带红石泉矿床多期次铀成矿作用探讨  

Study on Multistage Uranium Mineralization of Hongshiquan Deposit in Longshoushan Metallogenic Belt

作　　者：王贵 王伟 王刚 李涛 刘涛 WANG Gui;WANG Wei;WANG Gang;LI Tao;LIU Tao(No.203 Research Institute of Nuclear Industry,Xianyang 712000,Shaanxi,China)

机构地区：[1]核工业二○三研究所,陕西咸阳712000

出　　处：《西北地质》2021年第2期157-165,共9页Northwestern Geology

基　　金：中国核工业地质局“甘肃省龙首山成矿带三岔—金边寺地区铀矿资源调查评价与勘查”(202002)。

摘　　要：红石泉矿床在中国是最为典型的伟晶岩型铀矿床。近几年,通过系统工作,发现红石泉矿床具有多期次铀成矿的特点,不同成矿期形成了不同的矿石、铀矿物和蚀变特征。分别对不同铀成矿作用的拆分研究发现,在中条晚期花岗质岩浆演化到后期形成了富含晶质铀矿的浅肉红色伟晶花岗岩矿石,基本无蚀变,矿体集中于伟晶花岗岩体核部;在海西期含矿热液沿伟晶花岗岩与黑云母斜长片岩接触破碎带发生钠交代成矿作用,形成紫红色伟晶花岗岩矿石,形成沥青铀矿物;矿石发育钠长石化、赤铁矿化、碳酸盐化和绿泥石化等蚀变。因此,伟晶花岗岩体核部以及伟晶花岗岩与片岩接触破碎带可以作为重要的找矿部位。Hongshiquan deposit in Chinais the most typical uranium deposit of pegmatite type.In recent years,Hongshiquan deposit is found to have multi-stage uranium mineralization.Different ore,uranium minerals and alteration characteristics formed in different mineralization periods.Studies of different uranium mineralization show that in the late Zhongtiao period,granitic magma evolved into the light flesh red pegmatite granite ore rich in uraninite,with the ore concentrated in the core of the pegmatite granite,basically without alteration.In the Hercynian ore bearing hydrothermal solution,sodium metasomatic mineralization occurred along the contact fracture zone between the pegmatite granite and biotiteplagioschist,forming purple red pegmatite granite ore and asphalt uranium mineral.The ore develops albitization,hematite mineralization,carbonation,chloritization and other alteration.Therefore,the core of pegmatite granite and the contact fracture zone between pegmatite granite and schist are the important prospecting areas.

关 键 词：铀成矿作用 岩浆演化 钠交代 红石泉矿床 

分 类 号：P619.14[天文地球—矿床学]