Universität zu Köln

Lehmkuhl, Frank ORCID: 0000-0002-6876-7377, Nottebaum, Veit ORCID: 0000-0003-0970-9449 and Huelle, Daniela (2018). Aspects of late Quaternary geomorphological development in the Khangai Mountains and the Gobi Altai Mountains (Mongolia). Geomorphology, 312. S. 24 - 40. AMSTERDAM: ELSEVIER SCIENCE BV. ISSN 1872-695X

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Abstract

The reconstruction of geomorphological processes as a result of environmental change is approached by investigating and dating some fluvial, aeolian and lacustrine archives at specific locations that form a N-S basin and range transect across the Khangai Mountains south to the eastern Gobi Altai mountains in Mongolia. Geomorphological processes varied a) spatially with different climatic conditions and vegetation cover in relation to different elevation and latitude and b) temporally due to climatic shifts during the late Quaternary. In total, 15 sections from three distinct sub-regions along that transect were dated by 22 OSL ages. The Khangai Mountain sub-region exhibits mainly late Glacial to Holocene aeolian silty to sandy cover sediments mainly in the upper catchment reaches (>1800 m a.s.l.). Sections in the northern and central Gobi represent river terraces and alluvial fans in basin areas as well as aeolian sediments in the mountains above 2200 m a.s.l. The oldest terrace surface found in this study (T2; NGa1) dates to the penultimate Glacial cycle. The T1 terrace surfaces, on the northern Khangai Mountain front and in the central Gobi sub-region yield a maximum accumulation during the global Last Glacial Maximum (gLGM) and late Glacial time. During the gLGM phase represents rather sheetflow dominated transport built the alluvial fans and in late Glacial times the sediments exhibit more debrisflow controlled accumulation. Incision, forming the TI-terrace edges is therefore, supposed for the Pleistocene-Holocene transition and subsequent early Holocene. The geomorphic evidence is interpreted as stronger fluvial morphodynamics induced by enhanced humidity under beginning interglacial conditions. These processes coincided with the development of aeolian mantles at higher altitudes in the Khangai and Gobi Altai mountains where higher temperatures and humidities supported the formation of a vegetation cover, that served as a dust trap at least since late Glacial times and reduced the sediment supply on the alluvial fans. (C) 2018 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lehmkuhl, Frank UNSPECIFIED orcid.org/0000-0002-6876-7377 UNSPECIFIED Nottebaum, Veit UNSPECIFIED orcid.org/0000-0003-0970-9449 UNSPECIFIED Huelle, Daniela UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-182423
DOI:	10.1016/j.geomorph.2018.03.029
Journal or Publication Title:	Geomorphology
Volume:	312
Page Range:	S. 24 - 40
Date:	2018
Publisher:	ELSEVIER SCIENCE BV
Place of Publication:	AMSTERDAM
ISSN:	1872-695X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NORTH CENTRAL MONGOLIA; STRIKE-SLIP-FAULT; WESTERN MONGOLIA; SOUTHERN MONGOLIA; TIBETAN PLATEAU; CENTRAL-ASIA; ENVIRONMENTAL-CHANGES; STATISTICAL-MODELS; MOISTURE EVOLUTION; GLACIAL MAXIMUM Multiple languages Geography, Physical; Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18242