摘要
利用ETM,ASTER卫星遥感数据和DEM资料对西藏嘎拉错地区第四纪湖相沉积和地质环境进行了研究。结果表明:共和运动的差异隆升使藏南多庆错—嘎拉错区中更新世湖相地层发生了强烈变形,而角度不整合面的存在则显示共和运动的存在;嘎拉错的急剧干涸可能是在全球性气候转暖的背景下,玛不错一线近东西向断隆成为盆地新的分水岭之后,入湖河流的断流所致;嘎拉错干枯导致该区大面积土地荒漠化,加剧了区域自然环境的恶化。
To verify the lacustrine deposition and geological environment in Gala Co of Tibet in Quaternary Period,the authors carried out studies in this aspect by using remote sensing technologies such as DEM,ETM and ASTER interpretation images,The results show that severe deformation of lake deposition in southern Tibet during Middle Pleistocene epoch was caused by differential uplift of Gonghe movement,and angular unconformity proved the existence of this movement.It is held that the drastic drying of Gala Co was caused by its running dry after the adjacent Mabu Co had become a new dividing range in the basin as a consequence of global warming.The dryness of Gala Co has caused desertification in the region and worsened the regional natural environment.
出处
《国土资源遥感》
CSCD
北大核心
2012年第1期59-64,共6页
Remote Sensing for Land & Resources
基金
中国地质调查局青藏高原生态地质环境遥感调查与监测项目(编号:1212010911090)资助
关键词
多庆错
嘎拉错
第四纪
湖相沉积
地质环境
Duoqingcuo lake
Galacuo lake
quaternary period
lacustrine deposition
geological environment
