LATE MIOCENE UPLIFT HISTORY OF THE NORTHERN QILIAN SHAN CONSTRAINED BY THE LONGITUDINAL PROFILE
The North Qilian Shan are located on the northeast edge of the Qinghai-Xizang Plateau,where a series of thrust fault zones have developed.They are roughly divided into three parts:the South,Central,and North Qilian Shan,divided by two large strike slip faults:the Haiyuan Fault and the Changma Fault.The selected rivers in this article are six river basins:Baiyang River,Hongshuiba River,Fengle River,Maying River,Dazhuma River,and Hongshui River.The Baiyang River is located in the central part of the Qilian Shan fault,the Hongshuiba River is between the West Qilian Shan fault and the Fodongmiao-Hongyazi fault,the Fengle River is located in the central part of the Fodongmiao-Hongyazi fault,the Maying River is located in the eastern part of the Fodongmiao-Hongyazi fault,and the Dazhuma River and Hongshuihe River are located in the central part of the Zhangye fault.The 10Be samples were collected from metamorphic rocks,granite,and some sedimentary rocks located in the Mesozoic or Quaternary periods during the Carboniferous Ordovician and Precambrian periods.Using the RiverProAnalysis method,a set of river elevation profile analysis functions,to simulate the geological uplift history of the samples.Research has found that at around 4 Ma,the uplift rate of the North Qilian Shan gradually increases,and the uplift rate is roughly between 0.20 mm/a and 0.38 mm/a.Until 0.6～1.0 Ma,the uplift rate rapidly accelerated and showed a steep increase trend.Therefore,the tectonic uplift of the North Qilian Mountains is not uniform,but changes over time.
bedrock channels in the northern Qilian Shanchannel steepness indexstream-power incision modeluplift history
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