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Sedimentation rate changes across the Chinese Loess Plateau from luminescence dating of Malan loess in the Sanmen Gorge

Published online by Cambridge University Press:  18 September 2024

Gang Hu
Affiliation:
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
Huiying Wang
Affiliation:
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
Bo Xu
Affiliation:
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
Ping Wang
Affiliation:
State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
Liubing Xu
Affiliation:
Department of Geographical Sciences, South China Normal University, Guangzhou 510631, China
Jinming Xie
Affiliation:
Department of Geographical Sciences, South China Normal University, Guangzhou 510631, China
Xin Wang
Affiliation:
Key Laboratory of Western China's Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
Long Qiao
Affiliation:
First Monitoring and Application Center, China Earthquake Administration, Tianjin, 300180, China
Changhui Guo
Affiliation:
First Monitoring and Application Center, China Earthquake Administration, Tianjin, 300180, China
Junkang Wang
Affiliation:
Key Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing 100871, China
Jiafu Zhang
Affiliation:
Key Laboratory for Earth Surface Processes, Department of Geography, Peking University, Beijing 100871, China
Wenxu Wang
Affiliation:
Earthquake Administration of Henan Province, Zhengzhou 450016, China
La Ta
Affiliation:
First Monitoring and Application Center, China Earthquake Administration, Tianjin, 300180, China
Lei Wang*
Affiliation:
First Monitoring and Application Center, China Earthquake Administration, Tianjin, 300180, China
*
*Corresponding author email address: hswang@fmac.ac.cn

Abstract

The Chinese Loess Plateau (CLP), recognized as the world's largest loess plateau, has been a subject of ongoing debate regarding the continuity of its sedimentary loess sequence due to its intricate depositional environment. In this study, we conducted dating on a 9.8-m-long Malan loess core obtained from the Sanmen Gorge in the southern CLP using optically stimulated luminescence (OSL). The OSL dates indicate loess deposition between 52.4 and 11.3 ka, with no apparent hiatus on a millennial scale, and a sedimentation rate (SR) exhibiting six distinct episodes. Additionally, a comprehensive review of 613 OSL ages from 18 sections at 14 sites across the CLP was conducted. The results reveal loess deposition at most sites shows no apparent hiatus on a millennial scale over the past 60 ka, except for two specific locations. High SR episodes during Marine Isotope Stage (MIS) 3 across the CLP were attributed to heightened dust emissions from the source region and an enhanced dust deposition efficiency, while MIS 2 deposits were influenced by an intensified East Asian winter monsoon. Low SR episodes during MIS 1 at most sites were likely associated with reduced atmospheric transportation and pedogenesis. Spatially heterogeneous SR variations across the CLP might be influenced by local depositional environments.

Information

Type
Research Article
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of Quaternary Research Center

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