内蒙古大板盆地铀成矿条件及远景预测  

Characteristics of uranium metallogenic condition and potential prediction of the Daban volcanic basin in Inner Mongolia

作　　者：王青 WANG Qing(Geological Party No.243,CNNC,Chifeng 024006,Inner Mongolia,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024000

出　　处：《矿产勘查》2022年第6期759-767,共9页Mineral Exploration

基　　金：中国核工业地质局铀矿地勘费项目《河北省沽源县-内蒙古突泉县铀-多金属矿资源调查评价与勘查》(202001)资助。

摘　　要：大板盆地地处扎兰屯火山岩型铀成矿远景带南部,包含十二吐和新城子2个次级火山盆地,区内目前已发现小型铀矿床1个、铀矿点3个、铀异常点几十个。近年来通过地质调查、地球物理测量和钻探查证发现,十二吐次级火山盆地铀异常矿化产于潜火山岩体外接触带附近,铀矿化类型为潜火山岩型;新城子次级火山盆地铀异常矿化受断裂构造控制,铀矿化类型为蚀变裂隙带型。矿化与赤铁矿化、硅化、萤石化和黄铁矿化关系密切。本文介绍了盆地的地质背景,分析了盆地的铀源、构造、岩浆岩、放射性异常、热液蚀变等铀成矿条件,介绍了区内潜火山岩型和蚀变裂隙带型2种矿化类型的典型矿点特征及深部钻探揭露情况,在盆地南部预测了王家大院和五间房2处铀找矿靶区,初步评价了靶区的铀资源潜力。认为该盆地成矿条件较好,有较好的找矿前景。Daban volcanic basin is located in the southern part of Zhalantun volcanic-type uranium metallogenic prospective zone,containing two secondary volcanic basin—Shi’ertu and Xinchengzi.In the area,one small deposits,three uranium deposits and dozens of uranium anomalies have been found.In recent years,we found that In Shi’ertu secondary volcanic basin,uranium abnormal mineralization mainly occurs near the contact zone of subvolcanic rock mass,type of uranium mineralization is subvolcanic;In the Xinchengzi secondary volcanic basin,mineralization is mainly controlled by NW and EW faults,type of uranium mineralization is altered fractured zone.Uranium mineralization is closely related to hematite mineralization,silicification,fluoritization and pyritization,through geological survey,geophysical survey and drilling verification.This paper introduces the geological background of the basin,uranium metallogenic conditions such as uranium source,structure,magmatic rock,radioactive anomaly and hydrothermal alteration in the basement and cap rocks of the basin are analyzed,the characteristics of two typical mineralized types of subvolcanic and altered fracture zones in the area and the exposure of deep drilling are introduced.Prediction of uranium prospecting target area of Wangjiadayuan and Wujianfang in the southern part of the basin,and Preliminary evaluation of uranium resource potential in target area is given.It is believed that the basin has good metallogenic conditions and has a good prospecting potential.

关 键 词：内蒙古大板盆地 铀成矿条件 铀矿化特征 远景预测 

分 类 号：P619.14[天文地球—矿床学]