Universität zu Köln

Vlaminck, Stefan, Kehl, Martin, Rolf, Christian ORCID: 0000-0002-1459-6664, Franz, Sven Oliver, Lauer, Tobias, Lehndorff, Eva, Frechen, Manfred and Khormali, Farhad ORCID: 0000-0001-6805-7343 (2018). Late Pleistocene dust dynamics and pedogenesis in Southern Eurasia - Detailed insights from the loess profile Toshan (NE Iran). Quat. Sci. Rev., 180. S. 75 - 96. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0277-3791

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Abstract

In southern Eurasia recurrent phases of aridization, dust source extension and enhanced Aeolian sedimentation alternated with moister intervals, promoting reduced deflation areas and dust accumulation in the context of late Pleistocene climate changes. Weathering and soil forming intensity in this greater region are, hence, mainly governed by fluctuations in the balance between dust supply and moisture availability. Among the hitherto known sections, the Toshan loess-soil sequence (LPS) represents a key site due to the quality of the record and the multitude of available data giving detailed insights into the timing and magnitude of dust accumulation and soil formation of the region. To elucidate these dynamics for much of the past 130.000 years bulk mineralogical and geochemical data are presented supplemented by a high resolution magnetic susceptibility record and by the results of a detailed micromorphological study of loess at Toshan. The last interglacial Luvisol/Phaeozem-like (similar to MIS 5e) and the early glacial interstadial steppic palaeosols (similar to MIS 5 c and a) are characterized by gradually increasing grain-size and decreasing degrees in decomposition of micaceous and mafic minerals. Pronounced feldspar weathering is detected in the last interglacial and modern soils only, which formed under reduced or absent dust deposition on penultimate and last glacial loess, respectively (postsedimentary). The overall pedosedimentary conditions correspond to large scale trends of increasing drought, dust accumulation and wind strength in southern Eurasia in relation to decreasing moisture availability towards the early Pleniglacial (similar to MIS 4), causing soil formation under ongoing dust deposition (synsedimentary). Similar intervals of synsedimentary soil formation are recorded during the interglacial/interstadial-stadial transitions of the early glacial and during pleniglacial (similar to MIS 4 to 2) interstadials. The latter are marked by gradual increases in magnetic susceptibility, colour and decreasing texture. Conversely, silicate weathering could not be detected, suggesting that grain-size fluctuations are a primary feature. Thus, windy and arid pleniglacial conditions in southern Eurasia were interrupted by intermittent phases of synsedimentary soil formation, in response to short-lived and relatively moist interstadials. Although the interrelation of these incipient soils, throughout southern Eurasia is afflicted with considerable restrictions, the oscillatory pattern of the Toshan LPS bears great similarity with millennial-scale oscillations recorded in limnic archives of western Asia. (C) 2017 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Vlaminck, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Kehl, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Rolf, Christian UNSPECIFIED orcid.org/0000-0002-1459-6664 UNSPECIFIED Franz, Sven Oliver UNSPECIFIED UNSPECIFIED UNSPECIFIED Lauer, Tobias UNSPECIFIED UNSPECIFIED UNSPECIFIED Lehndorff, Eva UNSPECIFIED UNSPECIFIED UNSPECIFIED Frechen, Manfred UNSPECIFIED UNSPECIFIED UNSPECIFIED Khormali, Farhad UNSPECIFIED orcid.org/0000-0001-6805-7343 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-198795
DOI:	10.1016/j.quascirev.2017.11.010
Journal or Publication Title:	Quat. Sci. Rev.
Volume:	180
Page Range:	S. 75 - 96
Date:	2018
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0277-3791
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language REGION NEGEV DESERT; PALEOSOL SEQUENCES; CASPIAN SEA; NORTHERN IRAN; CENTRAL-EUROPE; CLIMATE-CHANGE; PALEOCLIMATIC IMPLICATIONS; MAGNETIC-SUSCEPTIBILITY; CENTRAL-ASIA; GRAIN-SIZE Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/19879