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商河地区沙一中广泛发育陆源碎屑与湖相碳酸盐的混合沉积。本文将混积层系、混积岩和呈零星分布的一起定义为广义的混合沉积,并且对于混合沉积来讲,没有一个具体的组分含量标准,只要该沉积物(岩)的确为陆源碎屑与碳酸盐的沉积,而非成岩作用或以后改造的假混合就可认定为混合沉积。研究区内混合沉积特征为陆源碎屑与湖相碳酸盐以较高的频率交互沉积和同一岩层内陆源碎屑组分与碳酸盐组分混合沉积,混合沉积的类型分为三类,即渐变式混合沉积、突变式混合沉积和复合式混合沉积,其中复合式沉积分为复合式沉积Ⅰ和复合式沉积Ⅱ,研究区内复合式沉积Ⅰ发育,复合式沉积Ⅱ不发育。并且本文从研究区混合沉积的区域地质背景、岩石学特征、沉积环境等方面进行了详细分析,建立了混合沉积相模式,进而对混合沉积的控制因素进行了讨论。
Mixed deposition of terrigenous clastic and lacustrine carbonate was widely developed in Sha1 in Shanghe area. In this paper, mixed layers, mixed rocks and sporadic distribution are defined as generalized mixed sediments, and for mixed deposition, there is not a specific standard for the content of components, as long as the sediment (rock) Sediment and carbonate deposition, and non-diagenesis or later modified false mixture can be identified as mixed deposition. The mixed depositional features in the study area are that the terrigenous clasts and the lacustrine carbonate are alternately deposited at relatively high frequency and the sedimentary and carbonate components of the same source rock are mixed and deposited. The types of mixed deposition are divided into three types , That is, gradual mixed deposition, abrupt mixed deposition and composite mixed deposition, in which composite deposition is divided into composite deposition Ⅰ and composite deposition Ⅱ, composite deposition in the study area Ⅰ development, complex deposition Ⅱ does not develop. In addition, the paper analyzes the regional geological background, petrological characteristics and sedimentary environment of mixed deposition in the study area and establishes a mixed sedimentary facies model. Then the controlling factors of mixed deposition are discussed.