洞庭盆地第四纪构造活动特征  

CHARACTERISTICS OF TECTONIC MOVEMENT OF DONGTING BASIN IN THE QUATERNARY PERIOD

作　　者：梁杏[1] 张人权[1] 皮建高 张国梁 孙锡良 

机构地区：[1]中国地质大学工程学院,湖北武汉430074 [2]湖南省地勘局水文地质工程地质二队,湖南长沙410014

出　　处：《地质科技情报》2001年第2期11-14,共4页Geological Science and Technology Information

基　　金：国土资源部科技资助项目 ( 992 0 0 8) ;国土资源部地质调查项目 ( 199912 3 0 0 0 3 0 14专题 2 )

摘　　要：利用沉积等厚线图 ,分析得出的洞庭盆地第四纪构造活动特征如下 :北北东及近东西向两组断裂将盆地切割为一系列断块 ;盆地西部为箕状断块 ,东部为箕状凹陷 ;早、中更新世为盆地的断陷阶段 ,晚更新世以来进入坳陷阶段 ;第四纪以来构造沉降速率呈加速度增强 ;构造活动的时空变化控制着洞庭湖的演变。Based on the analysis of isopach maps, the characteristics of tectonic movement of Dongting Basin in the Quaternary are concluded as the following: Dongting Basin has been cut into a series of fault blocks by two sets of faults in the directions of NNE and or nearly EW; there are dustpan-like fault blocks in the west and dustpan-like depressed blocks in the east of Dongting Basin; Dongting Basin had been a fault basin in the Early and Middle Pleistocene, and had become a depressed basin since the Late Pleistocene; the tectonic subsidence rate has been accelerating since the beginning of the Quaternary; and the evolution of Dongting Lake has been controlled by time and space distribution of tectonic movement.

关 键 词：洞庭盆地 第四纪 新构造运动 构造沉降 等厚线图 时空变化 

分 类 号：P546[天文地球—构造地质学]