库车前陆盆地古近系露头层序地层学  

Outcrop Sequence Stratigraphy of the Eogene Strata in Kuqa Foreland Basin,Xinjiang

作　　者：严德天[1] 王华[2] 王家豪[2] 

机构地区：[1]中国科学院地质与地球物理研究所岩石圈构造演化重点实验室,北京100029 [2]中国地质大学资源学院,武汉430074

出　　处：《地质科技情报》2006年第5期21-26,共6页Geological Science and Technology Information

基　　金：中国科学院知识创新工程项目(KZCX3-SW-147);国家重点基础研究发展规划项目(G1999043303)

摘　　要：应用露头层序地层学基本原理和方法,在新疆库车前陆盆地古近系各种层序界面露头标志分析的基础上,探讨了该区三级层序、层序区域对比的基本特征以及层序发育的盆缘背景。研究表明:古近纪库车前陆盆地充填整体为一个二级层序,并进一步划分为8个三级层序;盆地基底的东、西分块是造成古近系充填层序纵向发育不协调的深部原因;通过沉积体系类型及演化与盆缘背景、构造活动的响应关系分析,推论了库车前陆盆地楔顶带的存在;楔顶带的发育抑制了构造活动期源于造山带的物源供给,使前陆盆地前渊带的沉积物供给速率趋于稳定。Parasequences and sedimentary tracts, the characteristics of each third order sequence and the correlation of several outcrop sections in Kuqa foreland basin are described and discussed based on the outcrop sequence stratigraphic analysis with particular attention to key surfaces. Eogene sequence stratigraphy has been divided into one second order sequences and eight third order sequences. The development of Eogene sequences in lateral directions is discrepant, which is likely to be related with the pre-existing eastwest partition of the basin basement. Also the analysis of tectonic-sedimentary responses confirms the vgedge of foreland basin,which restrained the supply of coarse clastic from the north orogenic belt so as to keep supply-rate of sediment relatively steady in the tectonic activity.

关 键 词：层序地层 古近系 库车前陆盆地 

分 类 号：P539.2[天文地球—古生物学与地层学]