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《2017中国地球科学联合学术年会论文集(十一)——专题22:环青藏高原盆山体系构造过程与高原生长、专题23:青藏高原周缘活动构造与构造地貌研究进展》2017年
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Tectonic geomorphology of the Qilian Shan in the northeastern Tibetan Plateau:insights into the plateau formation processes

张会平  张培震  Veronica Prush  郑德文  郑文俊  王伟涛  刘彩彩  任治坤  
【摘要】:We examined the regional scale topography of the Qilian Shan on the northeastern margin of the Tibetan plateau. Longitudinal profiles and geomorphometric indices, such as slope, local relief and channel steepness reveal that the Qilian Shan was developed as a local plateau with high-relief steep marginal ranges, and interior low-relief topography. Landscape mapping across this local plateau revealed spatially varied origins of the lowrelief landscape in the Qilian Shan. North of the Haiyuan fault, universal massive intermontane aggradation was identified. However, the low-relief plateau to the south of the Haiyuan fault was dominated by relict erosional surfaces, even though accompany basin-filling still contributes. The geomorphologic contrasts led us to integrate both the basin-filling processes and antecedent low-relief erosional surfaces into a new insight into the development of the Qilian Shan plateau in the northeastern Tibet. Our present study highlights that explanation for the low-relief plateau formation needs to consider the complex geological evolution of the Qilian Shan, and the Tibetan Plateau itself.

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