库车坳陷库车组砂岩型铀矿找矿方向新解  

Prospecting Direction of Sandstone Type Uranium Deposits of Kuqa Formation,Kuqa Depression

作　　者：王元元[1] 王强强[1] 王国荣[1] 善曹特 李书海[1] 吕俊维 陈瑞 WANG Yuanyuan;WANG Qiangqiang;WANG Guorong;SHAN Caote;LI Shuhai;LYU Junwei;CHEN Rui(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2021年第3期369-376,共8页Uranium Geology

基　　金：中国核工业地质局项目(编号:202108-1、201907-2、201907-1、201907-4、201708-2)资助。

摘　　要：库车组为库车坳陷重要的铀赋矿层位,其层间氧化带研究程度较为薄弱,影响对其成矿预测。文章在对库车组氧化砂体及矿化调查的基础上,进行相关矿化砂岩铀镭地球化学特征研究,分析层间氧化带形成过程,并浅析其铀找矿方向。库车组主要赋矿层位为其下段,氧化砂岩可分为广布于直线褶皱带中西段和秋里塔格复背斜西段的褐红色氧化岩系、秋里塔格复背斜带中西段的褐黄色氧化岩系、秋里塔格复背斜带中东段的浅黄色氧化岩系,相关矿化砂岩分别偏镭(Ra/U为6.25~20.00)、偏铀(Ra/U为0.07~1.69、一般0.37~0.93)、偏铀(Ra/U为0.34~0.38)。结合岩性岩相特征及秋里塔格复背斜带隆升过程,将3类氧化岩系形成依次归于准同生氧化阶段、层间氧化阶段、后生叠加氧化阶段,判断秋里塔格复背斜带西段玉尔滚一带、中段日达里克-温巴什一带、中东段墩买里-温巴什一带分别为各氧化岩系相关铀矿化的有利探索部位。Kuqa Formation is an important uranium ore-bearing layer in Kuqa depression,but the research level on the interlayer oxidation is quite low,which affected the potential evaluation in the depression.Based on the geological survey and geochemistry study of U and Ra,we analyzed the spatial distribution and formation of oxidized sandstone and discussed the uranium prospecting direction.The oxidized sandstone can be divided into maroon oxidized rock series,brown yellow oxidized rock series,and light yellow oxidized rock series,which are sequentially formed in quasi-simultaneous oxidation stage,interlayer oxidation stage,and late oxidation stage,the related mineralized sandstone is of high Ra(Ra/U=6.25~20.00),high U(Ra/U=0.07~1.69),balanced(0.37~0.93),high U(Ra/U=0.34~0.38)respectively.Above all,the west,mid-west part,mid-east part of Qiulitage mountain are the favorable uranium prospecting area related to maroon oxidized rock series,brown yellow oxidized rock series,and light yellow oxidized rock series.

关 键 词：库车坳陷 库车组 铀矿 层间氧化带 找矿方向 

分 类 号：P619.14[天文地球—矿床学]