干旱区生态环境知识资源中心(Arid): Climatically forced moisture supply, sediment flux and pedogenesis in Miocene mudflat deposits of south-east Kazakhstan, Central Asia

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DOI	10.1002/dep2.34
	Climatically forced moisture supply, sediment flux and pedogenesis in Miocene mudflat deposits of south-east Kazakhstan, Central Asia
	Voigt, Silke; Weber, Yuki; Frisch, Konstantin; Bartenstein, Alexander; Hellwig, Alexandra; Petschick, Rainer; Bahr, Andre; Pross, Joerg; Koutsodendris, Andreas; Voigt, Thomas; Verestek, Verena; Appel, Erwin
通讯作者	Voigt, S
来源期刊	DEPOSITIONAL RECORD
ISSN	2055-4877
出版年	2017
卷号	3 期号:2 页码:209-232
英文摘要	The continental settings of Central Asia witnessed increased desertification during the Cenozoic as a result of mountain uplift and the Paratethys retreat. The interaction of these tectonic-scale processes with orbitally forced climate change and their influence on Asia's atmospheric moisture distribution are poorly constrained. A Miocene succession of continental mudflat deposits, exposed in the Aktau Mountains (Ili Basin, south-east Kazakhstan), has great potential as a terrestrial palaeoclimate archive. About 90m of the 1700m thick succession comprise alluvial mudflat deposits and appear as cyclic alternation of coarse sheet floods, mudflat fines and semi-arid hydromorphic soils. In this study, bulk-sediment mineralogy and geochemistry, magnetic susceptibility, sediment colour and palynology are used to reconstruct environmental conditions by determining changes and forcing mechanisms in the intensity of sediment discharge, weathering and pedogenesis. The results presented here indicate four major periods of arid soil formation and one palustrine interval characterized by higher evaporation rates under highly alkaline/saline conditions. A positive correlation between weathering indices and the Mg/Al ratio suggest that these horizons correspond to maximum rates of evapotranspiration and aridity. The formation of mudflat fines is, instead, interpreted as representing higher detrital sediment production by more intense alluvial fan activity during times of higher precipitation. Time series analysis of weathering indices, colour and magnetic susceptibility data yields cycle-to-frequency ratios with the potential to represent Milankovitch cyclicity with short and long eccentricity as dominant periodicities. Periods of pronounced aridity, paced by long eccentricity forcing, reflect changes in moisture availability. On longer tectonic timescales, the persistent appearance of gypsum indicates a shift towards more arid conditions. This trend in climate is considered to result from the closure of the eastern gateway of the Mediterranean to the Indian Ocean that restricted circulation and enhanced salinity within the Eastern Paratethys.
英文关键词	Central Asia climate Miocene pedogenesis sediment flux terrestrial sedimentation
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000414179300005
WOS关键词	NORTHERN TIBETAN PLATEAU ; WESTERN QAIDAM BASIN ; ISLE-OF-WIGHT ; CLIMATE-CHANGE ; TIEN-SHAN ; LATE EOCENE ; TIAN-SHAN ; PALYNOLOGICAL RECORD ; CONTINENTAL GROWTH ; EARLY OLIGOCENE
WOS类目	Geology
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/332341
作者单位	[Voigt, Silke; Weber, Yuki; Frisch, Konstantin; Bartenstein, Alexander; Hellwig, Alexandra; Petschick, Rainer; Bahr, Andre; Pross, Joerg] Goethe Univ Frankfurt, Inst Geosci, Altenhoferallee 1, D-60438 Frankfurt, Germany; [Weber, Yuki] Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA; [Bahr, Andre; Pross, Joerg; Koutsodendris, Andreas] Heidelberg Univ, Inst Earth Sci, Neuenheimer Feld 234-236, D-69120 Heidelberg, Germany; [Voigt, Thomas] Friedrich Schiller Univ Jena, Inst Geosci, Burgweg 11, D-07749 Jena, Germany; [Verestek, Verena; Appel, Erwin] Univ Tubingen, Inst Geosci, Sigwartstr 10,Holderlinstr 12, D-72074 Tubingen, Germany
推荐引用方式 GB/T 7714	Voigt, Silke,Weber, Yuki,Frisch, Konstantin,et al. Climatically forced moisture supply, sediment flux and pedogenesis in Miocene mudflat deposits of south-east Kazakhstan, Central Asia[J],2017,3(2):209-232.
APA	Voigt, Silke.,Weber, Yuki.,Frisch, Konstantin.,Bartenstein, Alexander.,Hellwig, Alexandra.,...&Appel, Erwin.(2017).Climatically forced moisture supply, sediment flux and pedogenesis in Miocene mudflat deposits of south-east Kazakhstan, Central Asia.DEPOSITIONAL RECORD,3(2),209-232.
MLA	Voigt, Silke,et al."Climatically forced moisture supply, sediment flux and pedogenesis in Miocene mudflat deposits of south-east Kazakhstan, Central Asia".DEPOSITIONAL RECORD 3.2(2017):209-232.