【摘要】 根据在新疆准噶尔盆地西北缘乌尔禾-夏子街地区的野外地层露头观察、追索及钻孔资料分析研究,笔者认为,该区下白垩统吐谷鲁群是一套以灰绿色砂岩和红色、棕红色泥岩组成的干燥气候条件下形成的内陆湖相碎屑沉积,发育浅水三角洲体系,主要由三角洲平原和三角洲前缘相组成。吐谷鲁群碎屑岩的碎屑粒度由下而上可分为两个大的韵律旋回,即粗—细—粗—细,反映了水体扩展到萎缩再扩展的过程。有利铀成矿的砂岩层主要集中在两个韵律旋回的底部,形成于三角洲平原分流河道、决口扇、三角洲前缘水下分流河道和水下堤环境。更多还原

【Abstract】 Based on the observation and tracing of outcrops and borehole data analysis on the lower Cretaceous Tugulu group in Wuerhe-Xiazjie area of Xinjiang Junggar basin,Tugulu group is found to be composed of grey green and red sandstone and red or brown red mudstone which are considered to be the deposition of an inland lake under dry climate and belong to the delta plain facies and delta front facies of shallow water delta system.According to the granual size of clastic sediments,Tulugu group can be divided in to two depositional cycle of upward coarse-fine-coarse-fine rhythm,this indicates the processes of room expanding to room contract of the water body.The fovourable sandstones for uranium mineralization are located in the low part of the cycle which were deposited in distributary channel and crevasse fan of the delta plain fancies and underwater distributary channel and subaqueous levee of the delt frount facies.更多还原