Tectonic and sedimentary evolution of basins in the northeast of Qinghai-Tibet Plateau and their implication for the northward growth of the Plateau

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• 作者：Lidong Zhu ; Chengshan Wang ; Hongbo Zheng ; Fang Xiang ; Haisheng Yi and Dengzhong Liu
• 关键词：Qinghai-Tibet Plateau ; Strike-slip basin ; Foreland basin ; Hoh Xil Basin ; Qaidam Basin ; Jiuquan Basin
• 刊名：Palaeogeography, Palaeoclimatology, Palaeoecology
• 出版年：2006
• 出版时间：1 November 2006
• 年：2006
• 卷：241
• 期：1
• 页码：49-60
• 全文大小：2217 K

文摘

The northeast of the Qinghai-Tibet Plateau, from the Hoh Xil Basin to the Hexi Corridor Basin, demonstrates a basin-ridge geomorphy that is the result of the long-term uplift of the Qinghai-Tibet Plateau. The geological evolution of the Qinghai-Tibet Plateau is recorded in its associated basins. From the Cenozoic sedimentary filling pattern in the Hoh Xil, Qaidam and Jiuquan Basins, we find that the evolution of these basins is similar: they began as strike-slip basins, evolved into foreland basins, and then to intermontane basins. Foreland basins are the direct result of orogenic activity in the northeast of Qinghai-Tibet Plateau, and can be documented to have formed over the following time periods: 49–23 Ma for the Hoh Xil foreland basin, 46–2.45 Ma for the Qaidam foreland basin, and 29.5–0 Ma for the Jiuquan foreland basin. This northward migration in the timing of foreland basin development suggests that the northeastern part of Tibet grew at least in part by accretion of Cenozoic sedimentary basins to its northern margin.