冀北森吉图盆地早白垩世义县组沉积特征及沉积环境  

Sedimentary characteristics and its environment of Early Cretaceous Yixian Formation in Senjitu Basin,northern Hebei

作　　者：董旭明[1] 巩恩普[1] 陈登辉[1] 梁俊红[1] 关长庆[1] 白雪松[1] 李永杰[1] 

机构地区：[1]东北大学地质资源与工程研究所,沈阳110004

出　　处：《世界地质》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)

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.

关 键 词：义县组 沉积环境 森吉图盆地 冀北 

分 类 号：P531[天文地球—古生物学与地层学]