MIS6-MIS5 Climate Change of Yinchuan Basin Based on End-member Method

doi:10.19657/j.geoscience.1000-8527.2021.077

Abstract

Abstract:

The Yinchuan Basin is located in the junction of the East Asian monsoon and the west wind strip. Sediments in the basin records the climatic environment evolution. In this study, the climatic evolution sequence (MIS6-MIS5 period) in the basin was reconstructed with photoluminescence dating, grain-size analysis, and end-element analysis on sediments from borehole LS01. Four end-members (Em1 to Em4) with specific environmental indications were obtained from the end-element analysis. Em1: weak flow or lacustrine-facies deposits with weak hydrodynamics; Em2: fluvial deposits with strong hydrodynamics; Em3 and Em4: regional tectonic uplift. The climate evolution comprises six stages (1-6): (1) Yinchuan Basin had cold-arid climate with two tectonic uplift events in 150-137 ka (MIS6); (2) The climate was warm and humid as a whole, and there were three warm events at a1 (137-129 ka), a2 (124-120 ka), and a3 (118-111 ka) in 137-110 ka (MIS5); (3) the climate turned to cold and arid in 110-107 ka (MIS5); (4) 107-102 ka (MIS5), cold events b1 (106-104 ka) and b1 (106-104 ka) occurred and the climate was cold and dry in general; (5) 102-87 ka (MIS5), the climate was cold and arid; (6) in 84-75 ka (MIS5), there was a cold event L2 (87-84 ka) but the climate was warm and humid as a whole. The climate change in MIS6-MIS5 phase was mainly driven by solar radiation and precession in summer.

Key words: sediment grain size, end-member analysis, grain size-standard deviation, Yinchuan Basin, climate change

CLC Number:

P532

XU Keke, YANG Zhenjing, NING Kai, HAN Qiangqiang, BI Zhiwei, ZHAO Nannan. MIS6-MIS5 Climate Change of Yinchuan Basin Based on End-member Method[J]. Geoscience, 2021, 35(05): 1311-1322.

Figures/Tables 10

Fig.1 Location of the study area and borehole LS01

Fig.2 Lithology and age-depth relationship of borehole LS01(the line showing the result of linear interpolation, and the virtual shadow showing the confidence interval)

Fig.3 Particle size composition and parameters of borehole LS01

Table 1 OSL ages and dating parameters of borehole LS01

样号	α系数	深度/m	U/10^-6	Th/10^-6	K/%	含水率/%	剂量率/(Gy/ka)	等效剂量/Gy	年龄/ka
OSL-1	0.04±0.02	15.3	2.71	14.38	2.17	25±5	3.78±0.21	300.64±11.84	79.58±5.42
OSL-2	0.04±0.02	26.5	1.95	11.24	1.84	29±5	2.91±0.16	296.12±11.32	101.72±6.67
OSL-3	0.04±0.02	41.7	1.90	11.33	1.72	28±5	2.35±0.07	262.22±2.11	111.58±3.49
OSL-4	0.04±0.02	60.2	2.55	10.00	1.75	20±5	2.61±0.09	325.65±1.61	124.91±4.17
OSL-5	0.04±0.02	75.4	1.83	7.71	1.74	29±5	2.12±0.07	301.41±1.32	142.17±4.60
OSL-6	0.04±0.02	102.8	2.17	4.92	2.13	20±5	2.93±0.15	445.38±43.82	151.85±16.81

Fig.4 Standard deviation of grain size for borehole LS01

Fig.5 Linear correlation of end-members(a) and angular dispersion(b) for borehole LS01

Fig.6 End-member frequency distribution for borehole LS01

Fig.7 Correlation analysis of 145-273 μm and 1 240-1 596 μm fractions with the mean of each grain size

Fig.8 Comparison of sensitive grain size, end-members and average grain size of borehole LS01 with loess magnetic susceptibility and δ18O values

Fig.9 Comparison of Em2 curve and other climatic records

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