A Remote Sensing Analysis of Characteristics of Neotectonic Movement in Jianghan-Dongting Basin and Huarong Uplift

Abstract

During the geological remote sensing investigation and monitoring of Yangtze River Valley,the authors carried out the survey and research on geomorphology,Quaternary geology and neotectonic fracture at the 1∶250 000 scale by using the Landsat ETM images acquired around 2000.Detailed remote sensing investigation at the 1∶50 000 scale was conducted in an important area of Dongting Lake by using aerial photos,ALOS,SPOT and other high-resolution data.The investigation and comprehensive analysis show that Jianghan-Dongting Basin is a rift basin formed in late Yanshanian-Cenozoic period.It was on the whole in the subsidence state because of differential elevation causing the formation of the sub-Huarong uplift in the interior of the basin,which extensively deposited river lacustrine facies,alluvial facies and foothill facies Quaternary strata in mountain areas.Quaternary sedimentation within the basin is basically continuous deposition.The upwelling areas around Jianghan-Dongting basin are characterized by intermittent uplift.Neotectonic movement mainly finds expression in uplift,depression,tilting and fracturing.The structural subsidence and uplift of the surrounding mountains are controlled by the fractures on the edge and in the interior of the basin.