摘要
黄花沟地区位于准噶尔盆地北部,随着近年来铀矿勘查的投入,发现层间氧化带型铀矿化,主要产于下白垩统吐谷鲁群上段辫状河三角洲平原辫状河道砂体中。通过对大量钻孔岩心、野外露头的观察,结合剖面对比等手段,研究了吐谷鲁群上段砂体沉积特征及铀成矿潜力。结果显示,吐谷鲁群上段主要发育辫状河三角洲平原亚相,砂体连通性好、厚度大,为含铀含氧水的自蚀源区向盆地径流提供了先决条件;层间氧化带自北西向南东发育,受岩性岩相控制明显,揭露到的铀矿化主要产于氧化带翼部,表明氧化还原作用是该地区铀沉淀富集的主要控制因素;吐谷鲁群上段砂体总体存在后生氧化程度及砂体还原容量低的缺陷,于铀成矿不利,但局部富集有机质地段仍存在形成小型铀矿床的可能,下一步铀资源勘查应关注有机质的分布特征。
The Huanghuagou area is located in the northern part of the Ulungu depression in the Junggar Basin.With the investment of uranium exploration in recent years,the interlayer oxidation zone type uranium mineralization was found in the braided channel sand body of braided river delta plain,which originated in the upper part of Tugulu Group of the Lower Cretaceous.In order to understand the sedimentary characteristics and uranium mineralization potential of the upper member of Tuguru Group,a large number of borehole cores,outcrops and correlation of profiles was studied.The results show that braided river delta plain subfacies are mainly developed in the upper part of Tuguru Group,with good sand body connectivity and large thickness,which provides a prerequisite for runoff from the self-erosion source area of uranium-containing oxygenated water to the basin.The interlayer oxidation zone develops from NW to SE and is obviously controlled by lithology and lithofacies.The uranium mineralization is exposed mainly in the wings of the oxidation zone,indicating that REDOX reaction is the main controlling factor for uranium precipitation and enrichment in this area.In the upper part of Tuguru Group,the sand body has the defects of low epigenetic oxidation degree and low reduction capacity,which is unfavorable to uranium mineralization,but there is still the possibility of forming a small uranium deposit in the area of local enrichment of organic matter.It is concluded that the future uranium exploration in this area should pay attention to the distribution characteristics of organic matter.
作者
杨彦波
陈虹
王进伟
陈放
YANG Yan-bo;CHEN Hong;WANG Jin-wei;CHEN Fang(Geologic Party No.216,CNNC,Urumqi 830011,China)
出处
《科学技术与工程》
北大核心
2024年第23期9746-9756,共11页
Science Technology and Engineering
基金
中国核工业地质局铀矿地勘项目(202206)。
关键词
吐谷鲁群
沉积相
砂体
铀矿化
Tugulu Group
sedimentary facies
sand body
uranium mineralization
