Quaternary geomorphological evolution of the Kunlun Pass area and uplift of the Qinghai-Xizang (Tibet) Plateau
Quaternary geomorphological evolution of the Kunlun Pass area and uplift of the Qinghai-Xizang (Tibet) Plateau
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DOI：
10.1016/s0169-555x(00)00057-x
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发表时间：
2001-02
期刊：
影响因子：
3.9
通讯作者：
Yongqiu Wu;Z. Cui;Geng-nian Liu;Daokai Ge;Jiarun Yin;Qinghai Xu;Q. Pang
中科院分区：
文献类型：
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作者：
Yongqiu Wu;Z. Cui;Geng-nian Liu;Daokai Ge;Jiarun Yin;Qinghai Xu;Q. Pang
青藏高原昆仑山口地区发育一套晚新生代沉积。古地磁、ESR和热释光测年表明，它们的年代为上新世晚期至更新世早期。地层、沉积特征和动物群、植物群演化分析表明，昆仑山口地区上新世至第四纪早期（约5 ~ 1.1MaBP）为相对温暖湿润的环境，古湖泊发育。昆仑山口地区海拔不超过1500 m，柴达木盆地与昆仑山口盆地之间仅存在一个低的地形分水岭。昆仑山口地区的地貌格局受1.1- 0.6MaBP昆仑-黄河构造运动的影响。王昆冰川（0.7- 0.5Ma）是青藏高原及山口地区第四纪最大的冰川活动。冰川期冰川面积是现今山口冰川面积的3-5倍。当时没有西大滩谷。昆仑山口地区的极端地貌变化反映了早、中更新世青藏高原的突然隆升。高原的隆升对高原本身和周边地区都具有重要意义。
There is a set of Late Cenozoic sediments in the Kunlun Pass area, Tibetan Plateau, China. Paleomagnetic, ESR and TL dating suggest that they date from the Late Pliocene to the Early Pleistocene. Analyses of stratigraphy, sedimentary characteristic, and evolution of the fauna and flora indicate that, from the Pliocene to the early Quaternary (about 5–1.1 Ma BP), there was a relatively warm and humid environment, and a paleolake occurred around the Kunlun Pass. The elevation of the Kunlun Pass area was no more than 1500 m, and only one low topographic divide existed between the Qaidam Basin and the Kunlun Pass Basin. The geomorphic pattern in the Kunlun Pass area was influenced by the Kunlun–Yellow River Tectonic Movement 1.1–0.6 Ma BP. The Wangkun Glaciation (0.7–0.5 Ma) is the maximum Quaternary glaciation in the Pass and in other areas of the Plateau. During the glaciation, the area of the glaciers was 3–5 times larger than that of the present glacier in the Pass area. There was no Xidatan Valley that time. The extreme geomorphic changes in the Kunlun Pass area reflect an abrupt uplift of the Tibet Plateau during the Early and Middle Pleistocene. This uplift of the Plateau has significance on both the Plateau itself and the surrounding area.