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西藏活动构造系由9条近南北方向延伸和近等间距展布的活动构造带所组成。根据其与活动构造形成的相关的沉积物最老为下更新统或中更新统、活动构造带明显叠加并切割第三系及其前形成的东西构造带、岩浆带的区域地质构造、活动构造明显叠加并切割了上新世末期形成的高原剥蚀面、以及活动构造带的断陷盆地中动,植物化石所反映出来的古气候特征与第四纪冰期、间冰期的相似等等,均说明西藏活动构造开始形成于第四纪初期。
The tectonic activity of Tibet consists of 9 active tectonic belts extending nearly in the north and south direction and distributed at nearly equal intervals. According to its association with the active tectonics, the sediments are the oldest in the Lower Pleistocene or the middle Pleistocene. The active tectonic belts obviously superpose and cut the tectonic belts of Tertiary and its predecessors, the regional geological structure and tectonic activity of the magmatic belts Clearly superimposed and cut the plateau denuded surface formed at the end of the Pliocene and the palaeoclimate characteristics reflected by fauna and fossil plants in the faulted basin of active tectonism and similarities between the Quaternary and interglacial periods, Tectonic activities in Tibet began to form in the early Quaternary period.