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在野外剖面实测和室内分析的基础上,对冀北森吉图盆地义县组沉积地层的岩性、沉积构造和古生物特征等进行了详细的研究,并分析了其沉积环境。结果表明冀北森吉图盆地经历了沉积环境的巨大变化,岩相类型和岩石组合频繁更替,表现出快速沉积充填盆地的演化过程。其沉积环境主要可以分为河流沉积和湖泊沉积两种类型,每一个沉积旋回都是以洪积扇到河流相沉积开始,向湖泊相沉积演化,湖泊沉积阶段主要以湖水相对动荡的滨浅湖沉积为主。同时发现火山作用对该时期沉积环境有较大的影响。
Based on the field survey and laboratory analysis, the lithology, sedimentary structure and paleontology of the sedimentary strata in Yixian Formation in the Senjitu Basin of Hebei Province were studied in detail and the sedimentary environment was analyzed. The results show that the sedimentary environment has experienced tremendous changes in the Senktu Basin, Hebei Province. The lithofacies types and rock assemblages frequently change, indicating the evolution of the rapidly-filling basin. The sedimentary environment can be divided into two main types: river sedimentation and lake sedimentation. Each sedimentary cycle begins with the deposition of the alluvial fan to the river facies and the deposition to the lacustrine facies. The lacustrine sedimentation mainly takes the lagoon shallow Sediment-based. At the same time, it is found that the volcanism has a greater impact on the sedimentary environment during this period.