摘要
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 detailed field survey and laboratory analysis, the authors studied lithology, sedimentary conformation and palaeontological characteristics of the sedimentary strata of Yixian Formation in northern Hebei and the sedimentary experienced enormous c environment has been analysised. Results indicate that Senjitu Basin in northern Hebei has hanges of sedimentary environment and frequent replacements of lithofacies types and rock combination, showing the evolution model of rapid deposition basin -filling. The sedimentary environment divided in to fluvial deposit and lacustrine deposit. The sedimentary evolution of each depositional circle usually began with alluvial channel to fluvial deposit, and evolved into lacustrine deposit which is mainly made up of shore - shallow lake sedimentary model with relatively stirring hydrodynamic condition. The volcanism also had greater impact on the depositional environment during this period.
出处
《世界地质》
CAS
CSCD
2009年第4期445-450,共6页
World Geology
基金
教育部高等学校博士学科点专项科研基金(20060145016)
关键词
义县组
沉积环境
森吉图盆地
冀北
Yixian Formation
sedimentary environment
Senjitu Basin
northern Hebei
