摘要
恐龙沟地区是近年来准噶尔盆地新发现的铀成矿地段,铀成矿目的层中侏罗统头屯河组上段沉积相特征研究相对较低。通过钻孔岩心编录、测井曲线解释和薄片鉴定等方法,对头屯河组上段沉积相特征进行研究。认为头屯河组上段含矿砂岩主要为长石岩屑砂岩、岩屑砂岩,多发育平行层理,板状、槽状交错层理。概率累计曲线呈两段式、三段式和多段式分布。富含碳化植物碎屑,发育辫状河三角洲沉积体系。早期为辫状河三角洲平原亚相沉积,分流河道砂体连片分布;晚期为辫状河三角洲前缘亚相沉积,水下分流河道和水下分流河道间发育,局部发育河口坝。通过对区内沉积相特征与铀成矿关系研究,认为头屯河组上段铀成矿主要受沉积相变、沉积旋回性、还原条件、砂体非均质性等因素控制。
The Konglonggou area is a newly discovered uranium metallogenic area in Junggar Basin in recent years,but its sedimentary facies characteristics of the upper member of Toutunhe Formation of Middle Jurassic in the uranium target layer are currently poorly studied.This article systematically analyzes the sedimentary facies characteristics of the upper member of the Toutunhe Formation through drilling cores,logging curves,and thin section identification data.It is considered that the ore-bearing sandstones in the upper member of the Toutunhe Formation are feldspathic lithic sand-stones and lithic sandstones,with parallel bedding,tabular and trough cross bedding.The probability cumulative curve shows two-stage,three-stage and multi-stage distribution.It is rich in carbonized plant debris and develops braided river delta sedimentary system.Among them,during the early of the upper member of Toutunhe Formation,the braided river delta plain subfacies deposits and distributary channel sand bodies are contiguously distributed.For the later of the upper member of Toutunhe Formation,it turned out to be braided river delta front subfacies deposition,underwater distributary channel and underwater distributary channel development,local development mouth bar.Through the study of the rela-tionship between the characteristics of sedimentary facies and uranium mineralization in the area,.It is considered that the uranium mineralization in the upper member of Toutunhe Formation is mainly controlled by sedimentary facies change,sedimentary cycle,reduction conditions,sand body heterogeneity.and other factors.
作者
吴声明
唐湘飞
毛广振
牛军杰
Wu Shengming;Tang Xiangfei;Mao Guangzhen;Niu Junjie(Geologic Party No 216,CNNC,Urumqi,Xinjiang,830011,China)
出处
《新疆地质》
CAS
CSCD
2022年第2期256-262,共7页
Xinjiang Geology
基金
中国核工业地质局新疆准噶尔盆地及周边地区铀矿资源调查评价与勘查项目(201906)
新疆准噶尔盆地东部大井-老君庙地区铀矿资源调查评价项目(20190601)
准噶尔盆地东部沙丘河-老君庙地区头屯河组铀矿地质编图与选区项目(20190609)联合资助。
关键词
准噶尔盆地
恐龙沟地区
头屯河组
辫状河三角洲
控矿因素
Junggar Basin
Konglonggou area
Toutunhe Formation
braided delta
ore-controlling factors
