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一、坝区研究范围的一般描述长江自四川奉节白帝城起,至宜昌南津关止,长约200公里一段,系流经山地。两岸山地高程1,000～2,000公尺,地形险峻,溪谷深切,形成断续的峡谷河段。峡谷的上段称瞿塘峡、中段称巫峡、下段称西陵峡,全段称三峡。三峡枢纽坝址位于西陵峡内。西陵峡在地质上系由黄陵大背斜所组成,背斜轴位于西陵峡中部,方向大致与河谷正交。背斜西翼,有兵书宝剑峡与牛肝马肺峡二段。出露岩石为由前震旦纪直至第四纪的各个地质年代所形成的沉
I. General Description of the Research Area of the Dam The Yangtze River runs from Baidicheng, Fengjie, Sichuan Province until the closure of Nanjin, Yichang, about 200 km in length and flows through the mountain. Both sides of the mountainous mountain elevation of 1,000 to 2,000 meters, steep terrain, deep valley, the formation of intermittent canyon section. The upper reaches of the valley are called Qutang Gorge, the middle of which is called Wu Gorge, and the lower reaches are Xiling Gorge. The whole section calls the Three Gorges. Three Gorges Dam site is located in Xiling Gorge. Xiling Gorge is geologically composed by the Huangling anticline, anticlinal axis is located in the central Xiling Gorge, the direction of roughly orthogonal with the valley. Anticline West Wing, there are martial arts Po Sword Gap and cow liver Horseshoe II. Exposed rocks from the Pre-Sinian up to the Quaternary geological formation of various sediments