Characteristics and Types of Sedimentary Facies of Cretaceous in Yinmaili Area

The structural uplift is developed in Yinmaili area. According to available data of Cretaceous and the regional ancient relief in Yinmaili area, four types of sedimentary facies are identified, which include the alluvial facies, fan-delta facies, lacustrine facies and delta facies. Their lithologic features, sedimentary structures and vertical evolution sequences are analyzed in detail. For questionable existence of Yageliemu formation in this studied area, this paper indicates that original classification about the glutenite stratum into Jurassic should belong to bottom glutenite member (i.e. Yageliemu formation) by the strata contact relations. This means that in Yinmaili area the center of sedimentation and subsidence underwent multi-transportation, which is the important reason for the fact that large-scale variation and migration of sediments or sedimentary sand bodies occurred in this area.