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Late Quaternary aeolian activity in Gonghe Basin, northeastern Qinghai-Tibetan Plateau, China

Published online by Cambridge University Press:  20 January 2017

Mingrui Qiang ,
Fahu Chen ,
Lei Song ,
Xingxing Liu ,
Mingzhi Li  and
Qin Wang
Mingrui Qiang*
Affiliation:
MOE Key Laboratory of Western China’s Environmental Systems, Research school of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, PR China
Fahu Chen
Affiliation:
MOE Key Laboratory of Western China’s Environmental Systems, Research school of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, PR China
Lei Song
Affiliation:
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, PR China
Xingxing Liu
Affiliation:
MOE Key Laboratory of Western China’s Environmental Systems, Research school of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, PR China
Mingzhi Li
Affiliation:
MOE Key Laboratory of Western China’s Environmental Systems, Research school of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, PR China
Qin Wang
Affiliation:
MOE Key Laboratory of Western China’s Environmental Systems, Research school of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, PR China
*
*Corresponding author at: Research school of Arid Environment and Climate Change, Lanzhou University, No. 222, South Tianshui Road, Lanzhou 730000, PR China. Fax: + 86 931 891 2330. E-mail address:mrqiang@lzu.edu.cn (M. Qiang).
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Abstract

Aeolian deposits at four sites in the Gonghe Basin were used to reconstruct the history of aeolian activity over the late Quaternary. These deposits include well-sorted aeolian sand, paleosols and/or loess. Aeolian sand represents dune-field expansion and/or dune buildup, whereas paleosols indicate stabilization of dunes, accompanying ameliorated vegetation cover. On the basis of 25 dates by optically stimulated luminescence (OSL), it appears that aeolian activities occurred episodically at 33.5, 20.3, 13.9, 11.8–11.0, 9.4, 7.8, and 5.7 (5.5) ka, which is largely consistent with the recent findings from the adjacent semi-arid areas. Aeolian sand mobility occurring during the early to mid Holocene conflicts with a climatic optimum inferred from lacustrine records in the northeastern Qinghai-Tibetan Plateau. This inconsistency may be resolved by interpreting aeolian activity as a response to decreased effective moisture due to enhanced evaporation, induced by higher summer insolation at that time, together with local terrain and its effects on moisture. Our results suggest that aeolian sand and paleosol cannot be simply ascribed to regional dry and wet climates, respectively, and they most likely reflect changes in effective moisture.

Keywords

Aeolian activityAeolian sandPaleosolLuminescence datingGonghe Basin
Type
Research Article
Information
Quaternary Research , Volume 79 , Issue 3 , May 2013 , pp. 403 - 412
Copyright
University of Washington

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