青藏高原班公错的湖盆成因及构造演化

依据河湖相沉积物的沉积特征、沉积年龄和分布规律, 结合ETM+构造和第四系沉积地层的遥感解译, 对班公错湖盆的成因和构造演化特征进行系统的剖析.从地形地貌、沉积建造和构造上分析, 推断班公错湖盆为构造成因的拉分断陷湖盆.根据湖盆周边的断层活动特征和湖盆的沉积响应, 将班公错湖盆的演化分为4个阶段, 依次为湖盆打开的幼年期(晚于早中新世)、湖盆扩展的青年期(早于8.1±1Ma)、湖盆急剧扩展伴随湖盆中心南移的壮年期(晚于0.94Ma)和湖盆不对称萎缩的老年期(晚于0.23Ma). 

Causes and Tectonic Evolution of Bangong Lake Basin

Causes and tectonic evolution of Bangong lake basin are studied based on the results of geological survey, fluvial sedimentary natures, the age of deposition and its distribution law, referring to ETM+ remote sensing interpretation about tectonics and Quaternary sedimentary strata. Analysis of topography, sedimentary and tectonics indicates that Bangong lake basin is a pull-apart faulted basin; according to activity characteristics of the faults around the lake basin and sedimentary response, the evolution of lake basin is devided into four stages: infancy of lake basin open (later than the early Miocene), adolescence of basin expansion (8.1±1Ma), maturity of rapid expansion of the lake basin with lake basin center moving south (later than 0.94Ma) and gerontic age of lake basin asymmetric atrophy (later than 0.23Ma).