Environmental changes during the last glacial in the Eastern Tibetan Plateau revealed by loess sediments in the Aba Basin

XU Xuechao; LIU Li; YANG Shengli; WEN Chen; LI Rui; ZHANG Jingzhao; WANG Haiyan

doi:10.16562/j.cnki.0256-1492.2024022803

2024 Vol. 44, No. 4

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Article navigation > Marine Geology & Quaternary Geology > 2024 > 44(4): 168-179

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XU Xuechao, LIU Li, YANG Shengli, WEN Chen, LI Rui, ZHANG Jingzhao, WANG Haiyan. Environmental changes during the last glacial in the Eastern Tibetan Plateau revealed by loess sediments in the Aba Basin[J]. Marine Geology & Quaternary Geology, 2024, 44(4): 168-179. doi: 10.16562/j.cnki.0256-1492.2024022803

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XU Xuechao, LIU Li, YANG Shengli, WEN Chen, LI Rui, ZHANG Jingzhao, WANG Haiyan. Environmental changes during the last glacial in the Eastern Tibetan Plateau revealed by loess sediments in the Aba Basin[J]. Marine Geology & Quaternary Geology, 2024, 44(4): 168-179. doi: 10.16562/j.cnki.0256-1492.2024022803

Environmental changes during the last glacial in the Eastern Tibetan Plateau revealed by loess sediments in the Aba Basin

Key Laboratory of Western China’s Environmental Systems (Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China

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Corresponding author: YANG Shengli, shlyang@lzu.edu.cn

Received Date: 28 February 2024

Revised Date: 09 May 2024

Accepted Date: 09 May 2024

Publish Date: 28 August 2024

Abstract

Abstract

Loess deposits are widespread in the Eastern Tibetan Plateau (TP), and act as crucial terrestrial archives for past climate changes and dust activity. Studying their environmental signatures in detail offers valuable evidence to unravel the TP's environmental evolution processes and mechanisms. This study employs quartz optically stimulated luminescence dating to establish a robust chronology for the Gemo loess sequence in the Aba Basin. Utilizing multiple environmental proxies, we reconstructed the environmental change history since ~47 ka in the Aba Basin. Magnetic susceptibility, color index, and carbonate content records suggest a strengthened Indian summer monsoon during the Marine Isotope Stage 3, leading to a relatively humid Tibetan Plateau. The grain size records of the Gemo loess revealed four Heinrich events and Younger Dryas event, indicating the periods of intense dust activity and rapid climate change on the TP during the last glacial period. Comparisons with regional records highlight the significant influence of high-latitude climate system in the Northern Hemisphere on rapid climate change in the TP. Our results suggest that the Atlantic Meridional Overturning Circulation may be the controlling factor of dust activity and climate change in the TP. This study provided crucial evidence for deep understanding of the environmental evolution in TP during the last glacial period.
- loess /
- OSL dating /
- grain size /
- magnetic susceptibility /
- last glacial

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References

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