扎兰屯地区东沟营火山盆地铀成矿地质特征及找矿方向探讨  

Discussion on the Geological Characteristics of Uranium Mineralization and Prospecting Direction in Donggouying Volcanic Basin,Zhalantun Area

作　　者：房冬昱 FANG Dongyu(Research Institute No.240,CNNC,Liaoning,Shenyang 110000,China)

机构地区：[1]核工业二四〇研究所,辽宁沈阳110000

出　　处：《铀矿地质》2024年第5期940-950,共11页Uranium Geology

基　　金：中国核工业地质局铀矿调查评价项目(编号:2019-31、2020-26)资助。

摘　　要：东沟营火山盆地位于扎兰屯以北,处于大兴安岭中北段,盆地内广泛发育晚侏罗世火山岩,由于该地区地质调查程度较低,前人仅对一些铀矿化点进行了调查,对于火山盆地与铀矿化的关系并未进行深入的研究,无法起到以点带面的效果。近年来,核工业二四〇研究所对该火山盆地开展了中大比例尺的铀矿地质调查、矿点检查、评价工作,系统研究总结了东沟营火山盆地铀成矿地质条件、控矿因素等特征,认为该盆地具有较好的基底铀源层、深大断裂复合部位的次级裂隙为区内主要的控矿因素,多旋回、多期次发育的火山活动为铀成矿提供了成矿热液流体向上运移活动的通道,并且盆地内发育大量的铀矿化点和航放异常点,有较好的物化探异常显示,总体具有较好的铀成矿潜力。东沟营火山盆地下一步找矿方向应重点放在盆地边缘基底接触带附近,充分考虑盆地成矿地质条件,利用综合物化探方法对盆地边缘基底和盖层接触部位开展攻深找盲,以寻找次火山岩亚型铀矿化为主,兼顾裂隙蚀变带亚型和层间破碎带亚型铀矿化。Donggooying volcanic basin is located to the north of Zhalantun and in the north-central section of the Greater Khingan Range.Late Jurassic volcanic rocks are widely developed in the basin.Due to the low level of geological survey in this area,previous researchers only conducted investigation in some uranium occurrences.The relationship between volcanic basins and uranium mineralization was not studied in depth and formed referring idea to the regional uranium exploration.In recent years,Research Institute 240 of CNNC has carried out medium-and large-scale uranium geological surveys,mineral site inspections,and resource evaluations in the volcanic basin.The geological conditions of uranium mineralizationand and ore-controlling factors was systematically studied and summarized in Donggooying volcanic basin.It was found that the basin had favourable uranium source in the basement,the main ore-controlling factors were the secondary fissures in the complex parts of deep and large faults,and the multi-cycle and multi-stage volcanic activity provided motivation channels and oreforming fluid for the uranium mineralization.A large number of uranium prospects and airborne anomalies are developed in the basin with good geophysical and geochemical anomaly,which showed favourable overall uranium mineralization potential.The next step prospecting should focused on the basement contact zone at the edge of the basin and carry out deep exploration by fully considering the geological conditions of the basin's mineralization,with comprehensive geophysical prospecting methods.The main target is the sub-volcanic rock subtypes,attentions should also payed to the fissure-alteration zone subtype and interlayer fracture zone subtype.

关 键 词：扎兰屯地区 铀成矿特征 控矿因素 

分 类 号：P619.14[天文地球—矿床学]