【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。更多还原

【Abstract】 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 eastof 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.更多还原