Aeolian dust supply from the Yellow River floodplain to the Pleistocene loess deposits of the Mangshan Plateau, central China: Evidence from zircon U-Pb age spectra

QUATERNARY SCIENCE REVIEWS

卷:182

Article

Shang, Yuan^1,2  Prins, Maarten A.²  Beets, Christiaan J.²  Kaakinen, Anu¹  Lahaye, Yann³  Dijkstra, Noortje^2,7  Rits, Daniel S.²  Wang, Bin⁴  Zheng, Hongbo⁵  van Balen, Ronald T.^2,6 

[1] Univ Helsinki, Dept Geosci & Geog, POB 64, FIN-00014 Helsinki, Finland

[2] Vrije Univ Amsterdam, Fac Sci, Dept Earth Sci, De Boelelaan 1085, NL-1081 HV Amsterdam, Netherlands

[3] Geol Survey Finland GTK, Betonimiehenkuja 4, Espoo 02150, Finland

[4] Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Shaanxi, Peoples R China

[5] Yunnan Univ, Sch Resource Environm & Earth Sci, Kunming 650500, Yunnan, Peoples R China

[6] TNO, Geol Survey Netherlands, Princetonlaan 6, NL-3584 CB Utrecht, Netherlands

[7] UiT Arctic Univ Norway Tromso, Dept Geosci, Dramsveien 201, N-9037 Tromso, Norway

关键词: Provenance analysis;    Sanmen Gorge;    Mangshan Plateau;    End member modelling;    Grain-size;   

DOI  :  10.1016/j.quascirev.2018.01.001

来源: Elsevier

【 摘 要 】

The thick loess-palaeosol sequences in the Mangshan Loess Plateau (MLP; central China) along the south bank of the lower reach of the Yellow River provide high-resolution records of Quaternary climate change. In addition, substantial increases in grain-size and accumulation rate have been inferred in the upper part of the loess sequence, above palaeosol layer S2. This study investigates the sources of the long-term dust supply to the MLP and explores the mechanism behind the sudden increase in sediment delivery and coarsening of the loess deposits since S2 (similar to 240 ka) by using end member modelling of the loess grain-size dataset and single-grain zircon U-Pb dating. Our results indicate that the lower Yellow River floodplain, directly north of the MLP, served as a major dust supply for the plateau at least since the deposition of loess unit L9 and indirectly suggest that the integration of the Yellow River and the disappearance of the Sanmen palaeolake took place before L9 (similar to 900 ka). The sudden change in sedi-mentology of the Mangshan sequence above palaeosol unit S2 may result from an increased fluvial sediment flux being transported to the lower reaches of the Yellow River because of tectonic movements (initiated) in the Weihe Basin around 240 ka. Furthermore, sediment coarsening can be explained by the gradual southward migration of the lower Yellow River floodplain towards the MLP since the deposition of palaeosol S2. The migration is evidenced by the formation of an impressive scarp, and is likely caused by tectonic tilting of the floodplain area. (C) 2018 Elsevier Ltd. All rights reserved.

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