摘要
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 deposits, which is composed of terrigenous fragment and carbonate of lagoonal facies, develops extensively in the middle submember of Member 1 of Shahejie Formation of Shanghe Area. This paper definite mixed deposited which includes Hunji sequence, Hunji rock and some sporadic distribution, and as far as mixed deposits in a broad sense, and there is not a concrete standard range, if only it is for the reason the sediment or sedimentary rock deposits to terrigenous fragment and carbonate not for false mixed to sedimentation or transformation of sedimentation, it can be deeply convinced to be mixed deposits. In the study area, the characteristics of mixed deposits are interbedded strata between terrigenous fragment and carbonate of lagoonal facies in high frequency and mixing deposited between terrigenous fragment constituent and carbonate constituent in one layer. Mixed sedimentary type can be divided into 3 categories, blended mixed deposits, salutatory mixed deposits and complex mixed deposits, and the complex mixed deposits can be divided into complex mixed deposits Ⅰ and complex mixed deposits Ⅱ. In the study area, com- plex mixed deposits Ⅰ is developing and complex mixed deposits Ⅱ is not developing. This paper analyses the mixed deposits of study area carefully, such as geological setting, petrological characteristic and depositional environment, etc , establishes mixed sedimentaary model and discusses controlling factor of the mixed deposits.
出处
《沉积学报》
CAS
CSCD
北大核心
2007年第3期343-350,共8页
Acta Sedimentologica Sinica
基金
高等学校优秀青年教师教学科研奖励计划(教人〔2002〕5号)
湖北省高等学校优秀中青年科技创新团队项目(T200602)资助
关键词
商河地区
沙一中
混合沉积特征
混合沉积类型
混合沉积模式
acteristics, Shanghe region, the middle submember of Member 1 of Shahejie Formation, mixed sedimentation charmixed sedimentary type, mixed sedimentary model
