河南泌阳断陷湖盆等时层序地层框架模式探讨  

Discussion On Chorostratigraphic Framework Model in Biyang Fault depressed Lacustrine Basin,Henan Province

作　　者：胡受权[1] 

机构地区：[1]西南石油学院博士后流动站

出　　处：《华东地质学院学报》1998年第1期34-42,共9页Journal of East China Geological Institute

基　　金：国家重点实验室开放基金

摘　　要：泌阳断陷等时层序地层框架模式，反映了陆相层序展布特征及其沉积体系时空配置关系，揭示了断陷湖盆成盆演化史及沉积充填史。泌阳断陷沉积充填史划分为三个阶段（初始断陷充填阶段、主断陷充填阶段及坳陷充填阶段），并对应着三个盆地充填序列及其相应的构造层序。其中第二阶段包括强烈断陷充填亚阶段、稳定断陷充填亚阶段及断陷萎缩充填亚阶段，其沉积速率有由大到小的变化规律。早第三纪泌阳断陷湖盆经历了四个演化历程：山前洪水洼地→硫酸盐型滨浅湖→正常湖泊→碳酸盐型或硫酸盐型滨浅湖；相应地，湖盆南部边缘（陡坡带）和北部边缘（缓坡带）沉积楔状体演变过程分别为：冲积扇→陡坡型扇三角洲→缓坡型扇三角洲→冲积扇和冲积扇→三角洲→冲积扇。The chorostratigraphic framework model of Biyang fault depression has clearly reflected the distribution character of terrigenous sequence and its configuration of depositional system in time and space, and objectively revealed basin formation and evolution history, and sediment filling history of the fault depressed lacustrine basin. Sediment filling history of Biyang fault depression can be classified into three stages: initial, main and sag downfaulted filling stages which have in turn formed three correspond basin fill sequences and tectonic sequences.The second stage includes:intense ,stable and dormant downfaulted filling substages and the sedimentary rate decreases progressively. Palaeogene Biyang fault depressed lacustrine basin experiences four evolutionary phases:foothill flooding depression→sulfate coastal/shallow lake→normal lake→carbonate or sulfate coastal/shallow lake, in pace of this, the evolutionary process of sedimentary wedge is from fluvial fan→steep slope fan delta→gentle slope fan delta→fluvial fan in southern margin which belongs to steep slope zone, and is fluvial fan→delta→fluvial fan in northern margin which belongs to gentle slope zone.

关 键 词：等时层序地层 地层 框架模式 泌阳断陷 湖盆 

分 类 号：P534[天文地球—古生物学与地层学]