摘要
介绍了自2003年以来,利用遥感技术结合实地验证工作在青藏高原第四纪地质调查研究中取得的成果。我国现今内、外流流域分水岭在青藏高原中南部的位置形成于全新世初,即发生于晚更新世末(约0.01 Ma)的"那曲运动"是致使其形成的一次非常重要的地壳运动。那曲运动前,内、外流流域分水岭位于当惹雍错一带,该次新构造运动使分水岭向东迁移约500 km,造成原属于怒江源区的色林错、纳木错等广大区域转化为内陆盆地。基于青藏高原中南部第四纪地质,特别是晚更新世以来古河道空间展布特征的遥感调查结果,结合上更新统与全新统之间的高角度不整合面所显示出的那曲运动基本特征,对上述规律进行了较为系统的论述。
Making use of the remote sensing technique and field survey, the authors have studied the Quaternary geology of the Qinghai - Tibet Plateau since 2003, and the results indicate that the watershed of China＇ s inflow rivers and outflow rivers in the mid - southern Qinghai - Tibet Plateau was formed in early Holocene. The Nagqu Movement that occurred at the last stage of late Pleistocene was an important crust movement forming the dividing range. The remote sensing survey also discovered that the dividing range was situated in the Tangra Yumco area. The crust movement resulted in eastward migration of the watershed for 500 km, and the early riverhead area of the Nujiang River consisting of the Siling Co and Namo Co lakes became inland basins. Based on the results of the remote sensing survey of the Quaternary geology which mainly include the fossil river courses, the angular unconformity between Pleistocene and Holocene and the Nagqu movement in the mid - southern Qinghai - Tibet Plateau, this paper deals systematically with these phenomena and regularities.
出处
《国土资源遥感》
CSCD
2010年第B11期64-68,共5页
Remote Sensing for Land & Resources
关键词
青藏高原
那曲运动
内流河
外流河
分水岭迁移
Qinghai- Tibet Plateau
Nagqu movement
Inflow river
Outflow river
Migration of the watershed
