Sediments from the upper reaches of Yellow River did not enter into Shanxi-Shaanxi Gorge in the Neogene
Lin Xu1,2, Li Ling-Ling1, Liu Hai-Jin3, Chen Ji-Xin1
1 School of Civil Engineering and Architecture,China Three Gorges University,Hubei Yichang 443002,China; 2 Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education, China Three Gorges University,Hubei Yichang 443002,China; 3 School of Earth Sciences,East China University of Technology,Nanchang 330006,China
Abstract The emergence of rivers is the result of the tectonic activity and climate change in their basins. The Shanxi-Shaanxi Gorge is located at the junction of the upper and middle reaches of the Yellow River,which has irreplaceable geographical advantages for studying when the upper Yellow River enters into Shanxi-Shaanxi Gorge. At present,there is great controversy about when the Yellow River enters the Shanxi-Shaanxi Gorge,e.g.,the Miocene,Pliocene and Pleistocene. In this case,we carried out detrital zircon U-Pb age analysis and sedimentary facies observation on the Late Miocene and Pliocene strata in the northern parts of the Shanxi-Shaanxi Gorge. New 270 detrital zircons U-Pb ages are obtained from the Moshangou,Dayandun and Gaojiayinzi sections. Given the paleocurrent flow direction is from east to west and comparison of U-Pb ages with that of the potential source area,we conclude that the sediments of Moshangou and Dayandun profiles were derived from the proximal source of the northern parts of the Lüliang Mountain. The provenance analysis of the sandstone at the bottom of the Gaojiayinzi section indicate a northward sediment transport direction,and the sediments were mainly derived from the Mesozoic sedimentary strata in the northern Ordos block. Combined with the reported paleomagnetic ages of these strata,the northern section of the Shanxi-Shaanxi Gorge was dominated by near-source accumulation during 6.2~3.7 Ma,which is a response to the remote effect of the uplift of the Tibetan Plateau and the enhancement of the East Asian summer monsoon,and excludes the provenance relationship with the upper reaches of the Yellow River.
Fund:National Natural Science Foundation of China(No.41972212)
About author: Lin Xu, born in 1984,Ph.D.,associate professor,is engaged in the uplift of the Tibetan Plateau and the origin of the Yellow River and the Yangtze River. E-mail: hanwuji-life@163.com.
Cite this article:
Lin Xu,Li Ling-Ling,Liu Hai-Jin et al. Sediments from the upper reaches of Yellow River did not enter into Shanxi-Shaanxi Gorge in the Neogene[J]. JOPC, 2022, 24(3): 568-582.
Lin Xu,Li Ling-Ling,Liu Hai-Jin et al. Sediments from the upper reaches of Yellow River did not enter into Shanxi-Shaanxi Gorge in the Neogene[J]. JOPC, 2022, 24(3): 568-582.
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