干旱区生态环境知识资源中心(Arid): Sediment history mirrors Pleistocene aridification in the Gobi Desert (Ejina Basin, NW China)

Arid

DOI	10.5194/se-11-1375-2020
	Sediment history mirrors Pleistocene aridification in the Gobi Desert (Ejina Basin, NW China)
	Schwamborn, Georg; Hartmann, Kai; Wuennemann, Bernd; Roesler, Wolfgang; Wefer-Roehl, Annette; Pross, Joerg; Schloeffel, Marlen; Kobe, Franziska; Tarasov, Pavel E.; Berke, Melissa A.; Diekmann, Bernhard
通讯作者	Schwamborn, G
来源期刊	SOLID EARTH
ISSN	1869-9510
EISSN	1869-9529
出版年	2020
卷号	11 期号:4 页码:1375-1398
英文摘要	Central Asia is a large-scale source of dust transport, but it also held a prominent changing hydrological system during the Quaternary. A 223 m long sediment core (GN200) was recovered from the Ejina Basin (synonymously Gaxun Nur Basin) in NW China to reconstruct the main modes of water availability in the area during the Quaternary. The core was drilled from the Heihe alluvial fan, one of the world's largest alluvial fans, which covers a part of the Gobi Desert. Grain-size distributions supported by endmember modelling analyses, geochemical-mineralogical compositions (based on XRF and XRD measurements), and bioindicator data (ostracods, gastropods, pollen and non-pollen palynomorphs, and n-alkanes with leaf-wax delta D) are used to infer the main transport processes and related environmental changes during the Pleistocene. Magnetostratigraphy supported by radionuclide dating provides the age model. Grain- size endmembers indicate that lake, playa (sheetflood), fluvial, and aeolian dynamics are the major factors influencing sedimentation in the Ejina Basin. Core GN200 reached the pre-Quatemary quartz- and plagioclase-rich "Red Clay" formation and reworked material derived from it in the core bottom. This part is overlain by silt-dominated sediments between 217 and 110 m core depth, which represent a period of lacustrine and playa-lacustrine sedimentation that presumably formed within an endorheic basin. The upper core half between 110 and 0 m is composed of mainly silty to sandy sediments derived from the Heihe that have accumulated in a giant sediment fan until modem time. Apart from the transition from a siltier to a sandier environment with frequent switches between sediment types upcore, the clay mineral fraction is indicative of different environments. Mixed-layer clay minerals (chlorite/smectite) are increased in the basal Red Clay and reworked sediments, smectite is indicative of lacustrine-playa deposits, and increased chlorite content is characteristic of the Heihe river deposits. The sediment succession in core GN200 based on the detrital proxy interpretation demonstrates that lake-playa sedimentation in the Ejina Basin has been disrupted likely due to tectonic events in the southern part of the catchment around 1 Ma. At this time Heihe broke through from the Hexi Corridor through the Heli Shan ridge into the northern Ejina Basin. This initiated the alluvial fan progradation into the Ejina Basin. Presently the sediment bulge repels the diminishing lacustrine environment further north. In this sense, the uplift of the hinterland served as a tipping element that triggered landscape transformation in the northern Tibetan foreland (i.e. the Hexi Corridor) and further on in the adjacent northern intracontinental Ejina Basin. The onset of alluvial fan formation coincides with increased sedimentation rates on the Chinese Loess Plateau, suggesting that the Heihe alluvial fan may have served as a prominent upwind sediment source for it.
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	SCI-E
WOS记录号	WOS:000555403500001
WOS关键词	CLAY MINERAL DISTRIBUTION ; BADAIN JARAN DESERT ; NE TIBETAN PLATEAU ; QILIAN SHAN ; HALF-LIFE ; SURFACE SEDIMENTS ; SOUTH-ATLANTIC ; INNER-MONGOLIA ; LAKE-SEDIMENTS ; LOESS DEPOSITS
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/325377
作者单位	[Schwamborn, Georg; Hartmann, Kai; Wuennemann, Bernd] Free Univ Berlin, Appl Phys Geog, D-12249 Berlin, Germany; [Schwamborn, Georg; Diekmann, Bernhard] Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, D-14473 Potsdam, Germany; [Schwamborn, Georg] Istanbul Tech Univ, Eurasia Inst Earth Sci, TR-34469 Istanbul, Turkey; [Wuennemann, Bernd] East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200241, Peoples R China; [Roesler, Wolfgang] Univ Tubingen, Dept Geosci, D-72074 Tubingen, Germany; [Wefer-Roehl, Annette] Senckenberg Gesell Nat Forsch, D-60325 Frankfurt, Germany; [Pross, Joerg] Heidelberg Univ, Inst Earth Sci, D-69120 Heidelberg, Germany; [Schloeffel, Marlen] Univ Osnabruck, Inst Geog, D-49074 Osnabruck, Germany; [Kobe, Franziska; Tarasov, Pavel E.] Free Univ Berlin, Inst Geol Sci, D-12249 Berlin, Germany; [Berke, Melissa A.] Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA
推荐引用方式 GB/T 7714	Schwamborn, Georg,Hartmann, Kai,Wuennemann, Bernd,et al. Sediment history mirrors Pleistocene aridification in the Gobi Desert (Ejina Basin, NW China)[J],2020,11(4):1375-1398.
APA	Schwamborn, Georg.,Hartmann, Kai.,Wuennemann, Bernd.,Roesler, Wolfgang.,Wefer-Roehl, Annette.,...&Diekmann, Bernhard.(2020).Sediment history mirrors Pleistocene aridification in the Gobi Desert (Ejina Basin, NW China).SOLID EARTH,11(4),1375-1398.
MLA	Schwamborn, Georg,et al."Sediment history mirrors Pleistocene aridification in the Gobi Desert (Ejina Basin, NW China)".SOLID EARTH 11.4(2020):1375-1398.