塔东南隆起沉积-构造特征及其演化历史

摘要

Based on an analysis of data obtained from seismic profiles,cores,loggings and outcrops,and using the balanced section technology,this paper deals with structural-sedimentary characteristics and tectonic evolution history of the Tadongnan uplift belt in Tarim basin since Paleozoic.Six unconformities were identified on seismic profiles and,on such a basis,five major tectonic sequences were recognized.The Tadongnan Uplift was initially formed in Late Ordovician and experienced Caledonian,Hercynian,Indosinian,Yanshanian and Himalayan movements.Intra-continental deformation took place predominantly during the Mesozoic,with the extensional faulting controlled by two principal boundary faults respectively on the south and on the north.In Early Mesozoic and later,the Tadongnan Uplift experienced serious compressional reformation,thus forming the tectonic framework characterized by two depressions and two uplifts as seen at present.%基于地震剖面、岩心、测井和露头剖面等资料分析,运用平衡剖面复原技术,论述了塔里木盆地塔东南隆起带古生代以来的沉积-构造特征及其演化历史.在地震剖面上识别出6个地层不整合界面,划分了5个主要地层构造层序.指出塔东南隆起形成于晚奥陶世加里东运动,经历了加里东、海西、印支、燕山和喜山多次构造运动,在中生代以陆内变形为主,受到南北两条主边界断裂的控制,于中生代早期发生伸展断陷,并遭受晚新生代喜山运动的强烈挤压改造,形成了现今两凹两凸的构造格局.