Dust transport information and paleoclimatic changes revealed by the loess in Ranwu, south-eastern Xizang

doi:10.1007/s11707-023-1092-8

Front. Earth Sci.

2023, Vol. 17

Issue (4) : 956-969 https://doi.org/10.1007/s11707-023-1092-8

Dust transport information and paleoclimatic changes revealed by the loess in Ranwu, south-eastern Xizang

Meihui PAN^1,²(

), Huimin ZHAO^1,², Anna YANG³, Yougui CHEN^1,², Chenlu LI^1,²

¹. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
². Key Laboratory of Resource Environment and Sustainable Development of Oasis, Northwest Normal University, Lanzhou 730070, China
³. CAS Key Laboratory of Mountain Hazards and Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS), Chengdu 610041, China

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Abstract

The loess accumulation process has great potential to record patterns of atmospheric circulation change, paleoclimate, and paleoenvironmental evolution. South-eastern Xizang is a climatically sensitive region and here, we analyze a loess profile at Ranwu in order to explore the processes and interactions of dust transport and paleoclimate evolution in the region. Based on parametric grain size end-member analysis, optically stimulated luminescence (OSL) dating, and environmental proxies we show that the Ranwu loess profile comprises five end members (EMs). EM1 represents the fine silt fraction transported by high-altitude westerly winds over long distances; EM2 represents the medium silt fraction accumulated by glacier winds; EM3 is the coarse silt fraction transported by local dust storms under the action of strong glacier winds; EM4 represents the very fine sand fraction transported by strong local dust storms, different wind strengths controls the relative proportion of EM3 and EM4 over time. EM5 is the coarse sand fraction formed from the product of strong weathering of gravels. OSL dating shows loess sedimentation at Ranwu started around 11.16 ka. The prevailing climate was generally warm and wet between 11.6 and 4.2 ka, with four cooling events at 10.50, 9.18, 7.85, and 6.37 ka. Extensive paleosol development between 8.2 and 4.2 ka, a change to dry and cold climate conditions was favorable for loess formation after 4.2 ka. The palaeoenvironmental changes and abrupt climate events recorded in the Ranwu loess sequence are consistent with Holocene global environmental changes.

Keywords loess grain size end member the optically stimulated luminescencethe dust transport information environmental evolution southeastern Xizang region

Corresponding Author(s): Meihui PAN

Online First Date: 12 January 2024 Issue Date: 06 February 2024

Cite this article:

Meihui PAN,Huimin ZHAO,Anna YANG, et al. Dust transport information and paleoclimatic changes revealed by the loess in Ranwu, south-eastern Xizang[J]. Front. Earth Sci., 2023, 17(4): 956-969.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-023-1092-8
https://academic.hep.com.cn/fesci/EN/Y2023/V17/I4/956

Fig.1 Location of the Ranwu profile (about 160 cm in depth, 29°26'10.14”N, 96°48′30.06”E).

Fig.2 The depositional environment of the Ranwu loess.

Fig.3 Field sampling map (a) Sampling profile; (b) White circles denoting the OSL dating sampling site.

Fig.4 OSL characteristics of aliquots of samples. (a), (b), (c) Decay curve of OSL signal of RW-OSL-1, RW-OSL-2, RW-OSL-3; (d), (e), (f) Growth curves of the OSL signals obtained using the SAR protocol for RW-OSL-1, RW-OSL-2, RW-OSL-3.

Tab.1 Dating results of OSL samples from the Ranwu profile

Fig.5 Age-depth relationship of the Ranwu loess profile.

Fig.6 Results of end member analysis of Ranwu loess profile: (a) linear correlation coefficient; (b) angular deviation; (c) frequency distribution curve of end member.

Tab.2 Grain size feature of each end member

Fig.7 Grain size distribution curves of Ranwu loess profile (the grain size distribution curves of Ranwu loess, paleosol and transitional soil were compared with the loess in the same region and the Loess Plateau of China).

Fig.8 Changes in x_fd, a*, and Rb/Sr in the Holocene.

Fig.9 The correlation between each end member and Md, x_fd, a*, Rb/Sr.

Tab.3 Contents of different telomeres in the early, middle and late Holocene

Fig.10 Comparison of the content of each end member component, x_fd, Md, a*, and Rb/Sr in the Ranwu loess profile.

Table A1 Stratigraphic description of the Ranwu loess profile

Fig.11 Class-wise R² of the end-member models with varying numbers of end-members.

Fig.12 Variation of frequency-dependent magnetic susceptibility and carbonate content in Ranwu profile in Holocene.

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