Late Pleistocene and Holocene aeolian sedimentation in Gonghe Basin, northeastern Qinghai-Tibetan Plateau: Variability, processes, and climatic implications
Qiang, Mingrui1; Jin, Yanxiang1; Liu, Xingxing2; Song, Lei3; Li, Hao1; Li, Fengshan1; Chen, Fahu1
2016-01-15
发表期刊QUATERNARY SCIENCE REVIEWS
卷号132期号:2016页码:57-73
文章类型Article
摘要Although stratigraphic sequences of aeolian deposits in dryland areas have long been recognized as providing information about past environments, the exact nature of the environmental processes they reflect remains unclear. Here, we report the results of a detailed investigation of eight outcrop sections in the Gonghe Basin, northeastern Qinghai-Tibetan Plateau. Measurements of sediment grain-size and chemical composition indicate that the deposits are primarily of aeolian origin, consisting of inter-bedded, well-sorted sand, silty sand, loess and/or palaeosol; however, their occurrence varies from site to site. Fossil dune sands mainly occur in or close to the currently stabilized or semi-stabilized dune fields, whereas loess is distributed along the downwind marginal areas. This pattern of basin-scale differentiation was controlled mainly by spatial variability of sediment supply due to the antecedent sedimentary patterns within the basin. Together with previously-published optically stimulated luminescence (OSL) ages, 24 new OSL dates are used to elucidate the history of aeolian activity and its relationship to climatic Changes. There is no apparent relationship between past dune activity and downwind loess deposits. Deposition of silty sand probably occurred during past phases of windy, dry and cold climate in the Late Pleistocene. However, climatic factors alone cannot explain the occurrence of silty sand deposition. This is because the deposition of silty sand was always preceded by episodes of fluvial deposition prior to river incision, thereby indicating the importance of an 'activated' sediment supply associated with fluvial processes. Deposition of well-sorted sand occurred episodically, not only during the Late Pleistocene, but also during the early- to mid-Holocene. Vegetation conditions, controlled either by the occurrence of intervals of moisture deficit during the Late Pleistocene or by changes in the balance between precipitation and evapotranspiration at a local scale, played an important role in sand mobility and deposition. The effect of vegetation on sand mobility is also suggested by independent evidence of aeolian activity from Genggahai Lake in the Gonghe Basin. Here, the deposition of aeolian sand in the basin during the early- to mid-Holocene indicates a low level of effective moisture caused by high evaporation induced by higher summer insolation, despite the coeval increased regional precipitation recorded by lacustrine sediments. In contrast, late Holocene palaeosols represent a high level of effective moisture, and their formation did not necessarily require increased regional precipitation. Overall, our results suggest that the relationship between aeolian activity and regional climate change is complex, and that sand accumulations do not represent the consistent action of surface processes that are related to climatic changes. (C) 2015 The Authors. Published by Elsevier Ltd.
关键词Aeolian Activity Sand Accumulation Vegetation Condition Sediment Supply Luminescence Dating Climatic Change Gonghe Basin China
WOS标题词Science & Technology ; Physical Sciences
DOI10.1016/j.quascirev.2015.11.010
关键词[WOS]QUATERNARY ENVIRONMENTAL-CHANGES ; POSSIBLE FORCING MECHANISMS ; HUNSHANDAKE SANDY LAND ; CHINESE LOESS PLATEAU ; INNER-MONGOLIA ; HIGH-RESOLUTION ; NORTHERN CHINA ; OSL CHRONOLOGY ; GREAT-PLAINS ; LAKE AREA
收录类别SCI
语种英语
WOS研究方向Physical Geography ; Geology
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号WOS:000368956900005
引用统计
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5835
专题黄土与第四纪地质国家重点实验室(2010~)
作者单位1.Lanzhou Univ, Coll Earth & Environm Sci, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
3.Chinese Acad Geol Sci, Inst Hydrogeol & Environm Geol, Shijiazhuang 050061, Peoples R China
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Qiang, Mingrui,Jin, Yanxiang,Liu, Xingxing,et al. Late Pleistocene and Holocene aeolian sedimentation in Gonghe Basin, northeastern Qinghai-Tibetan Plateau: Variability, processes, and climatic implications[J]. QUATERNARY SCIENCE REVIEWS,2016,132(2016):57-73.
APA Qiang, Mingrui.,Jin, Yanxiang.,Liu, Xingxing.,Song, Lei.,Li, Hao.,...&Chen, Fahu.(2016).Late Pleistocene and Holocene aeolian sedimentation in Gonghe Basin, northeastern Qinghai-Tibetan Plateau: Variability, processes, and climatic implications.QUATERNARY SCIENCE REVIEWS,132(2016),57-73.
MLA Qiang, Mingrui,et al."Late Pleistocene and Holocene aeolian sedimentation in Gonghe Basin, northeastern Qinghai-Tibetan Plateau: Variability, processes, and climatic implications".QUATERNARY SCIENCE REVIEWS 132.2016(2016):57-73.
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