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Paleowind directions from the magnetic fabric of loess deposits in the western Chinese Loess Plateau and implications for dust provenance

Published online by Cambridge University Press:  01 April 2021

Xinbo Gao
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19 Beitucheng Western Road, Beijing, 100029, China
Qingzhen Hao*
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19 Beitucheng Western Road, Beijing, 100029, China CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing, 100049, China
Junyi Ge
Affiliation:
CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing, 100049, China Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, P.O. Box 643, Beijing, 100044, China
Long Han
Affiliation:
School of Environmental Science and Engineering, Southern University of Science and Technology, 1088 Xueyuan Road, Shenzhen, 518055, China
Yu Fu
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19 Beitucheng Western Road, Beijing, 100029, China University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing, 100049, China
Xuechao Wu
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19 Beitucheng Western Road, Beijing, 100029, China University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing, 100049, China
Chenglong Deng
Affiliation:
University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing, 100049, China State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19 Beitucheng Western Road, Beijing, 100029, China
Slobodan B. Marković
Affiliation:
Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 3, Novi Sad, 21000, Serbia Serbian Academy of Sciences and Arts, Knez Mihajlova 35, Belgrade, 11000, Serbia
Zhengtang Guo
Affiliation:
Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19 Beitucheng Western Road, Beijing, 100029, China CAS Center for Excellence in Life and Paleoenvironment, Beijing, 100044, China University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Beijing, 100049, China
*
Corresponding author: Qingzhen Hao, Email: haoqz@mail.iggcas.ac.cn

Abstract

The aeolian loess-paleosol sequences in the Chinese Loess Plateau (CLP) are an excellent archive of variations in atmospheric circulation in the geological past. However, there is no consensus regarding the roles of the East Asian winter monsoon and westerly winds in transporting the dust responsible for loess deposition during glacial and interstadial periods. We conducted detailed measurements of the anisotropy of magnetic susceptibility (AMS) on two parallel loess profiles covering the most recent 130 ka in the western CLP to determine paleowind directions. Results show that the magnetic lineations of the loess and paleosol units in both sections are significantly clustered along the northwest to southeast direction. These observations demonstrate that the prevailing wind system responsible for dust transport in the western CLP was the northwesterly winter monsoon, rather than the westerly winds. The AMS-derived dust-bearing wind direction was relatively stable during the last glacial and interglacial cycle in the western CLP, consistent with sedimentary and AMS evidence from the eastern CLP. Accordingly, it is reasonable to conclude that large areas of deserts and Gobi deserts areas located in the upwind direction were the dominant sources for the aeolian deposits of the Loess Plateau.

Type
Thematic Set: Eurasian Climate and Environment
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2021

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