陕西横山L2以来风沙/黄土沉积序列的粒度端元特征及其环境意义

doi:10.12118/j.issn.1000–6060.2021.05.14

Abstract

Abstract:

Influenced by climate oscillation, the desert boundary swings back and forth many times, consequently leaving overlapping deposits of loess, paleosol, and paleo-eolian sand in the stratum. Based on the traditional grain size parameters and the end member analysis model, this study attempts to discuss the grain size composition, corresponding sedimentary information, and sand advance and retreat of aeolian sand-sandy loess-sandy paleosol since L₂ of the HS profile in Hengshan County, Shaanxi Province, China. The results show that the grain size composition of the HS profile is different from that of the loess area. It is mainly composed of very fine sand (31.07%), fine sand (30.20%), and coarse silt (23.38%). Therefore, the grain size index with a global paleoenvironmental significance in the loess region may not be suitable for this region. The parameterized end member analysis model was used to separate the grain size to obtain the climate and environmental indicators suitable for this region. The mode particle size of EM1 was 8.93 μm, reflecting the westerly circulation information. Meanwhile, the average particle size of EM2 was 32.82 μm, indirectly indicating the change of the East Asian winter monsoon intensity to a large extent. The average particle size of EM5 was 235.46 μm, which is a substitute index of an extremely strong winter monsoon or a strong storm. Its content feeds back the winter monsoon intensity at that time. Research has shown five times of sand expansion events and three times of sand retreat events since L₂ in Hengshan, Shaanxi Province. The aeolian sand layer appeared to reflect the southeastward extensions of the Mu Us Desert in response to the episodic regional aridity controlled by the enhanced winter monsoon. A sandy loess layer was formed when the active dune migration was replaced by dust accumulation when the regional climate was still dominated by the winter monsoon, albeit with a greatly decreased strength. The paleosol developed when the winter monsoon was relatively shrinking. The aeolian sand layer formed in the ice age poses a potential threat to regional desertification. The protection of the Holocene soil layer is an important measure of preventing and controlling regional desertification.

Key words: grain size, end member modeling analysis, climate change, sand advance and retreat, Hengshan

LIU Rong,YUE Dapeng,ZHAO Jingbo,SU Zhizhu,SHI Hao,WANG Xiaoning. Characterisitics of grain size end members and its environmental significance of aeolian sand/loess sedimentary sequence since L₂ in Hengshan, Shaanxi Province[J].Arid Land Geography, 2021, 44(5): 1328-1338.

Figures/Tables 10

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References 31

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地层单元	S₀	L₁-1	L₁-2	S₁-1	L₂-1	L₂-2	S₁-2	L₂-3	L₂-4	L₂-5	L₂-6
平均粒径/μm	27.73	152.66	178.16	24.38	46.86	103.46	29.02	36.78	86.40	89.63	29.10
分选系数	1.23	1.07	1.12	1.73	1.24	1.12	1.78	1.40	0.90	1.29	1.50
偏度	0.18	0.14	0.18	0.35	0.30	0.21	0.34	0.35	0.24	0.34	0.18
峰度	1.03	1.08	0.90	1.36	1.19	1.55	1.34	1.26	1.48	1.48	0.93

端元	EM1	EM2	EM3	EM4	EM5
粒级区间/μm	0.89~39.91	3.17~158.87	15.89~200.00	35.57~355.66	35.57~1002.37
众数粒径/μm	8.93	39.91	89.34	158.90	317.00
平均粒径/μm	7.23	32.82	76.73	132.26	235.46

Characterisitics of grain size end members and its environmental significance of aeolian sand/loess sedimentary sequence since L₂ in Hengshan, Shaanxi Province

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Characterisitics of grain size end members and its environmental significance of aeolian sand/loess sedimentary sequence since L2 in Hengshan, Shaanxi Province

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Characterisitics of grain size end members and its environmental significance of aeolian sand/loess sedimentary sequence since L₂ in Hengshan, Shaanxi Province