Grain Size End-member Characteristics of the Aeolian Sediments in the East of Qinghai Lake and Its Environmental Significance Since 32 ka BP

doi:10.19657/j.geoscience.1000-8527.2023.119

Abstract

Abstract:

The typical aeolian sediments in the eastern part of Qinghai Lake are sensitive to climate changes, and these sediments provide an ideal window for the reconstruction of the paleoclimate environments.In this study, we selected an eolian sand-sandy paleosoil profile with a thickness of 10 m in the eastern area of Qinghai Lake as the study area.An end-member analysis model is used to analyze the data of sediment grain size, and the grain size components which are sensitive to climate changes are extracted thereafter.We combined the grain size and magnetic susceptibility indexes in our data analysis.We further discussed the environmental significance of each end-member indication and the environmental evolution in the eastern Qinghai Lake since 32 ka BP.The results show that the grain size component of the Dashuitang profile is mainly sand, and followed by silt, and the least is clay.The grain size components of sediments can be decomposed into three end-members: EM1, EM2, and EM3.EM1 is the sensitive grain size affected by winter monsoon, indicating the change of the strength of the winter monsoon.EM2 indicates the strength of regional environment affected by aeolian sand, which opposites to EM1.EM3 indicates sediment transport in the form of dust storms under the influence of a regional low-level wind system.The environmental evolution of the study area can be divided into four stages.During the last interglacial stage (32-23.2 ka BP), the climate was humid and the aeolian activities were relatively weak.During the last glacial maximum stage (23.2-15.8 ka BP), the climate was cold and dry, and the aeolian activities became stronger.During the last glacial deglaciation stage (15.8-9.5 ka BP), the climate was still mainly cold and dry, and the cold and warm fluctuated, but there is a small wave of warming.In the Holocene (since 9.5 ka BP), the climate fluctuated significantly.It was warm in the early period, warmest in the middle period, and cool in the late period.

Key words: end-member analysis, aeolian sand, environmental evolution, Qinghai Lake

CLC Number:

P532
P512.2

HU Mengjun, XU Aokang, SUN Wenli, ZHUANG Jing. Grain Size End-member Characteristics of the Aeolian Sediments in the East of Qinghai Lake and Its Environmental Significance Since 32 ka BP[J]. Geoscience, 2024, 38(02): 487-496.

Figures/Tables 9

References 54

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层序	地层名称	深度(m)	特征描述
1	表土层	0~0.3	灰黄色,松散,见植物根系
2	风砂层	0.3~ 1.3	灰黄白色中细砂,见少量植物根系
3	砂质古土壤层	1.3~2.3	深灰色,细砂,较紧实,有假菌丝体
4	风砂层	2.3~ 3.8	浅灰色,中细砂,存在风成加积纹层
5	砂质古土壤层	3.8~ 5.0	深灰色,细砂,较紧实
6	风砂层	5.0~5.3	灰白色,细砂,松散
7	砂质古土壤层	5.3~6.6	暗棕色粉砂,紧实,见白菌丝体
8	风砂层	6.6~7.7	粉砂和黏粒为主
9	砂质古土壤层	7.7~10.0	黏粒为主,胶结紧实

层序	地层名称	深度(m)	特征描述
1	表土层	0~0.3	灰黄色,松散,见植物根系
2	风砂层	0.3~ 1.3	灰黄白色中细砂,见少量植物根系
3	砂质古土壤层	1.3~2.3	深灰色,细砂,较紧实,有假菌丝体
4	风砂层	2.3~ 3.8	浅灰色,中细砂,存在风成加积纹层
5	砂质古土壤层	3.8~ 5.0	深灰色,细砂,较紧实
6	风砂层	5.0~5.3	灰白色,细砂,松散
7	砂质古土壤层	5.3~6.6	暗棕色粉砂,紧实,见白菌丝体
8	风砂层	6.6~7.7	粉砂和黏粒为主
9	砂质古土壤层	7.7~10.0	黏粒为主,胶结紧实

样品编号	采样深度(m)	测试指标						年龄±误差 (ka BP)
样品编号	采样深度(m)	U(10^-6)	Th(10^-6)	K(10^-6)	等效剂量(Gy)	年剂量(Gy/ka)	含水量(%)	年龄±误差 (ka BP)
08G-356	1.66~1.70	1.31	6.04	1.40	3.21±0.30	2.63	3.2	1.2±0.1
08G-357	2.56~2.60	0.84	4.80	1.35	5.20±0.08	2.29	2.5	2.3±0.1
08G-358	3.66~3.70	1.24	5.48	1.41	6.95±0.64	2.50	4.6	2.8±0.2
08G-359	5.26~5.30	1.36	6.45	1.38	8.82±0.29	2.60	3.6	3.4±0.1
08G-360	5.30~5.34	1.30	6.66	1.46	12.30±0.28	2.68	4.1	4.6±0.1
10G-46	5.92~5.96	1.43	7.47	1.57	25.75±1.48	2.94	5.0	8.7±0.6
10G-45	6.20~6.24	1.28	5.76	1.64	26.35±0.72	2.75	7.3	9.5±0.5
08G-362	6.60~6.64	1.50	7.35	1.45	42.54±1.95	2.71	9.3	15.8±0.7
08G-364	7.62~7.66	1.81	7.55	1.53	68.65±2.17	2.97	0.8	23.2±1.1
08G-365	9.96~10.0	1.45	6.73	1.51	86.45±2.97	2.91	6.0	31.9±1.3

样品编号	采样深度(m)	测试指标						年龄±误差 (ka BP)
样品编号	采样深度(m)	U(10^-6)	Th(10^-6)	K(10^-6)	等效剂量(Gy)	年剂量(Gy/ka)	含水量(%)	年龄±误差 (ka BP)
08G-356	1.66~1.70	1.31	6.04	1.40	3.21±0.30	2.63	3.2	1.2±0.1
08G-357	2.56~2.60	0.84	4.80	1.35	5.20±0.08	2.29	2.5	2.3±0.1
08G-358	3.66~3.70	1.24	5.48	1.41	6.95±0.64	2.50	4.6	2.8±0.2
08G-359	5.26~5.30	1.36	6.45	1.38	8.82±0.29	2.60	3.6	3.4±0.1
08G-360	5.30~5.34	1.30	6.66	1.46	12.30±0.28	2.68	4.1	4.6±0.1
10G-46	5.92~5.96	1.43	7.47	1.57	25.75±1.48	2.94	5.0	8.7±0.6
10G-45	6.20~6.24	1.28	5.76	1.64	26.35±0.72	2.75	7.3	9.5±0.5
08G-362	6.60~6.64	1.50	7.35	1.45	42.54±1.95	2.71	9.3	15.8±0.7
08G-364	7.62~7.66	1.81	7.55	1.53	68.65±2.17	2.97	0.8	23.2±1.1
08G-365	9.96~10.0	1.45	6.73	1.51	86.45±2.97	2.91	6.0	31.9±1.3

相关分析	EM1	EM2	EM3	平均粒径
EM1	1
EM2	-0.912^*	1
EM3	-0.021	0.209	1
平均粒径	-0.903^*	0.698^*	0.328^*	1