敦煌雅丹地层沉积物粒度特征初步研究

doi:10.12118/j.issn.1000–6060.2021.176

Abstract

Abstract:

The yardang strata is the material manifestation of the sedimentary system before the yardang landform developed. It collects a large amount of data about the deposition process, and sediment analysis is the foundation for interpreting its key findings. The research object in this paper is the Dunhuang yardang landforms in the Dunhuang Yardang Geopark, Gansu Province of northwest China and it is a preliminary study on the grain-size characteristics of the exposed strata sediments. The results indicated that: (1) The grain-size composition of Dunhuang yardang strata sediments is dominated by silt, with an average content of 41.08% (profile YA), 36.82% (profile YB), and 35.41% (profile YC), and its content decreases from east to west. It also contains coarse sand components with higher specific gravity, and the spatial change trend is the inverse of that of silty sand. (2) There are considerably vertical changes in the grain-size composition and parameters of the yardang strata, which are characterized by the alternation of coarse sand (primarily medium and fine sand) and fine sand (mainly silt and clay). Meanwhile, the interface is highly consistent with the shape of yardang’s three-level ladder. (3) The yardang stratum is the result of the mixed accumulation of various sediments formed under different sedimentary environments and dynamic mechanisms. It is primarily the result of alternate aeolian, fluvial, and lacustrine deposition. The subenvironmental types of fluvial and lacustrine sedimentary environments are the most complex and diverse, necessitating extensive research.

Key words: yardang strata, sediment, grain-size analysis, grain-size frequency distribution curve, grain-size parameter

LIANG Xiaolei,ZHAI Xiaohui,NIU Qinghe,HU Zihao,WANG Tianhu,LIU Wancheng. Grain-size characteristics of yardang strata sediment in the Dunhuang Yardang National Geopark, northwest China[J].Arid Land Geography, 2022, 45(1): 141-152.

Figures/Tables 9

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References 38

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样品		黏土（<3.9 μm）	粉沙（3.9~62.5 μm）	极细沙（62.5~125 μm）	细沙（125~250 μm）	中沙（250~500 μm）	粗沙+极粗沙（500~2000 μm）
剖面YA	平均值	14.69	41.08	10.51	17.60	13.53	2.60
	最小值	0.32	3.11	0.00	0.00	0.00	0.00
	最大值	51.56	85.16	41.94	53.93	54.98	37.40
	变异系数	1.11	0.76	1.10	1.16	1.36	2.62
剖面YB	平均值	12.13	36.82	14.04	20.66	13.31	3.03
	最小值	0.63	3.01	0.10	0.00	0.00	0.00
	最大值	58.10	84.43	40.34	57.42	48.65	19.35
	变异系数	1.25	0.81	0.90	0.97	1.28	1.75
剖面YC	平均值	18.33	35.41	8.32	13.23	14.73	9.98
	最小值	0.94	3.25	0.00	0.00	0.00	0.00
	最大值	59.50	83.38	36.57	54.42	44.20	40.25
	变异系数	1.03	0.83	1.08	1.18	1.13	1.42

样品		平均粒径（M_z）/μm	分选系数（δ_I）	偏度（SK₁）	峰度（K_G）
剖面YA	平均值	97.20	1.38	0.28	3.39
	最小值	3.66	0.64	-0.23	0.75
	最大值	430.00	2.36	0.68	6.53
	变异系数	1.13	0.25	0.56	0.46
剖面YB	平均值	99.50	1.45	0.28	3.74
	最小值	3.21	0.66	-0.18	0.81
	最大值	260.00	2.63	0.51	8.24
	变异系数	0.96	0.32	0.63	0.55
剖面YC	平均值	126.90	1.43	0.24	3.89
	最小值	3.17	0.78	-0.23	1.05
	最大值	400.00	2.64	0.52	14.00
	变异系数	1.09	0.26	0.66	0.61

Grain-size characteristics of yardang strata sediment in the Dunhuang Yardang National Geopark, northwest China

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