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Formation Mechanisms and Geomorphic Evolution of the Erlian Mudflow Fans, Eastern Guide Basin of the upper reaches of yellow river

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 578-589页

作者： ZHAO Wuji YIN Zhiqiang XU Qiang QIN Xiaoguang School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China China Institute of Geo-environment Monitoring Beijing 100081 China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China

Several argillaceous platforms lie along the yellow river（YR） of the eastern Guide Basin, northeastern Tibetan Plateau, and their compositions, formation processes, and geomorphic evolution remain debated. Using field survey data, sample testing, and high-resolution remote sensing images, the evolution of the Erlian mudflow fans are analyzed. The data show significant differences between fans on either side of the YR. On the right bank, fans are dilute debris flows consisting of sand and gravel. On the left bank, fans are viscosity mudflows consisting of red clay. The composition and formation processes of the left bank platforms indicate a rainfall-induced pluvial landscape. Fan evolution can be divided into two stages： early-stage fans pre-date 16 ka B.P., and formed during the last deglaciation; late-stage fans post-date 8 ka B.P.. Both stages were induced by climate change. The data indicate that during the Last Glacial Maximum, the northeastern Tibetan Plateau experienced a cold and humid climate characterized by high rainfall. From 16–8 ka, the YR cut through the Erlian early mudflow fan, resulting in extensive erosion. Since 8 ka, the river channel has migrated south by at least 1.25 km, and late stage mudflow fan formation has occurred.

关键词： the upper reaches of yellow river Guide Basin mud-flow fan forming mechanism geomorphic evolution

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STUDIES ON TERRACES AND river SYSTEM CHANGES OF THE upper yellow river

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Journal of Geographical Sciences 1997年第2期7卷 45-52页

作者： Wu Shengguang Yang Dayuan Department of Geography, Nanjing University, Nanjing 210093 People’s Republic of ChinaWang Yunfei Nanjing Institute of Geography and Limnology, Academia Sinica, Nanjing 210008 People’s Republic of China

There are seven steps of terrace both in the Guide basin and Gonghe basin along the yellow river. More close to the source, less the steps of terrace. Three ancient terraces are found in Gonghe basin. The upper reaches of the yellow river was joined up by a series of stream captures at different periods of time, the ancient yellow river linked up the Gonghe basin and Guide basin at the end of the middle Pleistocene, the Longyangxia gorge developed around 60 Ka.B.P., and the gorge between Maqu and Tangnag developed around 20 Ka.B.P.

关键词： the upper reaches of yellow river river terrace river system changes.

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