摘要
通过野外钻孔编录、室内测试分析、钻孔数据统计,结合砂体结构、垂向岩性序列、平面展布形态等特征研究,总结了洪海沟铀矿床主要含矿层头屯河组下段的沉积特征及展布样式,恢复了目的层构造展布形态。目的层主要发育辫状河三角洲平原亚相分流河沉积,分流河道发育有利容矿砂体;北西向缓倾单斜结合南部小型褶皱的构造格局控制了层间氧化带展布形态;通过对砂体结构类型、空间展布形态特征的研究,讨论了其与层间氧化带发育及铀富集关系,认为砂体垂向岩性序列组合样式、平面展布形态共同决定了铀矿化类型及富集部位,层间氧化带前锋线及铀矿化主要发育在岩性-岩相变化部位。
The vertical lithologic sequence and plane distribution shape,the sedimentary characteristics and distribution style of the lower section of Toutunhe Formation,the main ore bearing layer of honghaigou uranium deposit,and the distribution shape of target layer structure were restored by the study of field borehole logging,indoor test analysis and borehole data statistics.The target layer was found mainly the products of braided river delta and flat subfacies distributary river,favorable ore sand bodies was developed in the distributary channel,and the distribution form of interlayer oxidation zone were controlled by the NW trending gently dipping monocline combined with the structural pattern of small folds in the South.The relationship between sand body and the development of interlayer oxidation zone for uranium enrichment was established by the study on the structural type and spatial distribution morphological characteristics of sand body.It is considered that the combination style of vertical lithologic sequence and plane distribution morphology of sand body jointly determine the type and enrichment position of uranium mineralization.The front line of interlayer oxidation zone and uranium mineralization are mainly developed in the position of lithology lithofacies change.
作者
罗星刚
王守玉
王芳霞
刘富强
LUO Xinggang;WANG Shouyu;WANG Fangxia;LIU Fuqiang(Geologic Party No.216,CNNC,Urumqi,Xinjiang 830011,China)
出处
《铀矿地质》
CAS
CSCD
2022年第4期707-716,共10页
Uranium Geology
基金
中国核工业地质局“新疆伊犁盆地及周边地区砂岩型铀矿资源调查评价与勘查”项目(编号:202205)资助。
关键词
洪海沟铀矿床
砂体沉积特征
层间氧化带
铀矿化
Honghaigou uranium deposit
sedimentary characteristics of sand body
interlayer oxidation zone
uranium mineralization
