内蒙古五十家子—新城子地区火山岩型铀矿地质特征及找矿方向  

Metallogenic Characteristics and Prospecting Direction of Volcanic Type Uranium Deposits in the Wushijiazi-Xinchengzi Area,Inner Mongolia

作　　者：吴燕清 王常东[1] 余弘龙 周舰 林天发 于兵 董小宇 Wu Yanqing;Wang Changdong;Yu Honglong;Zhou Jian;Lin Tianfa;Yu Bing;Dong Xiaoyu(Geological Party No.243,China National Nuclear Corporation,Chifeng 024006,Inner Mongolia,China)

机构地区：[1]核工业二四三大队,内蒙古赤峰024006

出　　处：《吉林大学学报（地球科学版）》2023年第2期418-435,共18页Journal of Jilin University：Earth Science Edition

基　　金：中国核工业地质局铀矿调查评价项目(202001,202211-3)。

摘　　要：内蒙古五十家子—新城子地区位于滨太平洋成矿域兴蒙造山带铀-多金属成矿省,扎兰屯火山岩型铀成矿远景带南端,是我国北方热液型铀-多金属矿集区之一。区内中生代火山活动频繁且强烈,成矿地质条件优越,具有较好的找矿前景。根据富集储矿构造环境将研究区火山岩型铀矿划分为蚀变裂隙带和次火山岩2种类型,认为研究区铀成矿高峰期为晚侏罗世晚期—晚白垩世早期,相对集中在148.91~99.10 Ma之间,具时间跨度大、多期多阶段的特征;铀矿化异常主要沿西拉木伦河、黄岗粱—乌兰浩特断裂分布,多产于EW、NE向次级断裂和构造裂隙带内;富集于上侏罗统满克头鄂博组酸性熔岩、燕山晚期侵入岩内外接触带附近;主要受地层、断裂构造、火山机构、不同界面构造、次火山岩及热液蚀变复合控制。研究区铀矿找矿标志为火山盆地边缘靠近基底隆起带一侧发育酸性次火山岩部位,NE向控矿断裂带派生次级断裂交汇部位,花岗斑岩、流纹岩接触部位且硅化、赤铁矿化、紫黑色萤石化、水云母化蚀变叠加部位,物化探测量异常带耦合度较高的部位。初步建立研究区成矿模式,预测了曹家营子、王家大院、五间房、板山图4处重点铀矿勘查区。The Wujiazi-Xinchengzi area of Inner Mongolia is located in the uranium-polymetallic metallogenic province of the Xingmeng orogenic belt in the Marginal-Pacific metallogenic belt,and at the southern Zhalantun volcanic type uranium metallogenic prospect belt,which is one of the concentrated areas of hydrothermal uranium-polymetallic deposit in Northern China.Mesozoic volcanic activity is frequent and intense,and the metallogenic geological conditions are superior,so it has good prospects for ore prospecting.According to the tectonic environment of enriched ore deposits,the volcanic type uranium deposits in the study area are divided into two types:Altered fissure zone type and subvolcanic rock type.The peak of uranium mineralization was the Late Jurassic to early Late Cretaceous,relatively concentrated in 148.91-99.10 Ma,characterized by a long time span and multi-stages.Uranium mineralization anomalies are mainly distributed along the Xar Moron River fault and Huanggangliang-Ulanhot fault,and mostly occur in the EW-and NE-trending secondary faults and structural fracture zones.They are enriched in the acidic lavas of the Upper Jurassic Manketouebo Formation,near the inner and outer contact zones of Late Yanshanian intrusive rocks.The deposits are mainly controlled by strata,faults,volcanic edifices,different interface structures,sub-volcanic rocks and hydrothermal alteration.The uranium prospecting markers in the study area are the location of acidic subvolcanic rocks near the basement uplift zone at the edge of the volcanic basin,the junction of secondary faults derived from the NE-trending ore-controlling fault zone,the contact parts of granite-porphyry and rhyolite,and the location of high coupling degree of the abnormal physical and chemical detection zone,which developed with silicification,hematitization,purple-black fluorite and hydromica alteration.The metallogenic model of the study area was preliminarily established,and four key uranium exploration areas of Caojiayingzi,Wangjiadayuan,Wujianfang and Bans

关 键 词：火山岩型铀矿 成矿特征 找矿预测 成矿模式 五十家子—新城子地区 

分 类 号：P619.14[天文地球—矿床学]