首页|Drainage evolution in intermontane basins at the Qinling-Daba Mountains

Drainage evolution in intermontane basins at the Qinling-Daba Mountains

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River capture is of great significance to landform evolution and hominine migration.In the Qinling-Daba Mountains,there is a viewpoint that Jialing River captured Hanjiang River,but this is still controversial.In this paper,we discuss the drainage evolution processes in intermountain basins at the Qinling-Daba Mountains based on a combination of detrital zircon U-Pb geochronology and geomorphic indexes.We suggest that the Hanjiang River gradually captured the Jialing River from east to west,accompanied by the evolution of the ancient Yangtze River.In terms of geomorphic evidences,wide valleys did not match with discharge,and a series of wind gaps developed in the Shiquan-Ankang basin.In addition,the valley shapes and width-to-height ratios (Vf) indicate two possible rapid incisions.The hypsometric integrals (HI) reflect that the landform gradually changes from the old stage to the youth stage from west to east.The x values show that the drainage divide is moving to the side of the Yuehe River,and the Yuehe River is gradually shrinking.According to the sedimentary records,the zircon U-Pb age distributions indicate the provenance change.The 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 River.The 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 basin.In addition,it is shown that the evolution of the upper tributary basins lagged behind the response of the trunk channel to the tectonic activities and river captures.The interconnected wide valleys caused by river capture may have provided convenient geomorphological conditions for human migration into the Qinling-Daba Mountains along those river valleys.

Geomorphic indexZircon U-Pb geochronologyDrainage network patternRiver captureAnkang faultInter-mountain basinSouth Qinling

Wanting XIE、Xianyan WANG、Hanzhi ZHANG、Quanyu LIU、Shejiang WANG、Huayu LU

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School of Geography and Ocean Sciences,Nanjing University,Nanjing 210023,China

Colleage of Tourism and Environment Resources,Ankang University,Ankang 725000,China

Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences,Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China

Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Beijing 100044,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSecond Tibet Plateau Scientific Re-searchMajor Program of National Social Science Foundation of China

nos.4197100541522101419010042019QZKK020519ZDA225

2021

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

CSCDSCI
影响因子：1.002
ISSN：1674-7313
年,卷(期)：2021.64(11)
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