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drainage evolution in intermontane basins at the Qinling-Daba Mountains

Science China Earth Sciences 2021年第11期64卷 1949-1968页

作者： Wanting XIE Xianyan WANG Hanzhi ZHANG Quanyu LIU Shejiang WANG Huayu LU School of Geography and Ocean Sciences Nanjing UniversityNanjing 210023China Colleage of Tourism and Environment Resources Ankang UniversityAnkang 725000China Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China Center for Excellence in Life and Paleoenvironment Chinese Academy of SciencesBeijing 100044China

River capture is of great significance to landform evolution and hominine *** the Qinling-Daba Mountains,there is a viewpoint that Jialing River captured Hanjiang River,but this is still *** this paper,we discuss the drainage evolution processes in intermountain basins at the Qinling-Daba Mountains based on a combination of detrital zircon UPb geochronology and geomorphic *** suggest that the Hanjiang River gradually captured the Jialing River from east to west,accompanied by the evolution of the ancient Yangtze *** terms of geomorphic evidences,wide valleys did not match with discharge,and a series of wind gaps developed in the Shiquan-Ankang *** addition,the valley shapes and width-toheight ratios(Vf)indicate two possible rapid *** hypsometric integrals(HI)reflect that the landform gradually changes from the old stage to the youth stage from west to ***χvalues show that the drainage divide is moving to the side of the Yuehe River,and the Yuehe River is gradually *** to the sedimentary records,the zircon U-Pb age distributions indicate the provenance *** high-altitude terraces show three age peaks(200–250,400–505,and 700–900 Ma),with the dominant Indosinian age peak(200–250 Ma),while the modern fluvial sediments only show a single peak of Jinning(700–900 Ma).These data show that there are two major river captures:(1)The ancient Hanjiang River cut through the regional compression ridge,and then captured the Hanzhong Basin river system(a part of the ancient Jialing river system)from east to west,and(2)The southern tributary captured the trunk with the uplift of the divide in the Shiquan-Ankang Basin,forming the modern drainage pattern in the upper Hanjiang *** activities of the regional strike-slip fault,and the associated compression uplift played a key role in the river captures,the drainage evolution,and related landforms in the Shiquan-Ankang *** addition,it is shown that the

关键词： Geomorphic index Zircon U-Pb geochronology drainage network pattern River capture Ankang fault Intermountain basin South Qinling

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