毛乌素沙地新月形和抛物线形沙丘表层沉积物粒度特征

毛乌素沙地新月形和抛物线形沙丘表层沉积物粒度特征

李静芸, 傅天阳, 申玉龙, 王立辉, 伍永秋

Grain-size characteristics of surface sediments of barchan and parabolic dunes in the Mu Us Desert

Jingyun Li, Tianyang Fu, Yulong Shen, Lihui Wang, Yongqiu Wu

表1 毛乌素沙地不同类型沙丘各部位沉积物粒度组成（%）

Table 1 Grain size composition of sediments in different types of Mu Us Desert

沙丘类型	沙丘部位	粒级百分含量%
沙丘类型	沙丘部位	黏粒 >9 Φ	粉沙 4~9 Φ	极细沙 3~4 Φ	细沙 2~3 Φ	中沙 1~2 Φ	粗沙 0~1 Φ	极粗沙 -1~0 Φ
新月形沙丘	迎风坡	0.12 ± 0.30^ac	2.47 ± 2.43^ac	6.01 ± 4.42^ac	42.01 ± 13.53^ac	42.72 ± 10.36^ac	6.63 ± 6.91^ac	0.05 ± 0.23^ac
	丘顶	0.11 ± 0.27^ac	2.27 ± 2.46^ac	4.00 ± 2.66^ac	37.60 ± 15.89^ac	46.79 ± 9.69^ac	9.22 ± 8.64^ac	0.01 ± 0.04^ac
	背风坡	0.10 ± 0.22^ac	2.05 ± 2.24^ac	3.80 ± 4.62^ac	39.16 ± 16.29^ac	47.05 ± 13.36^ac	7.83 ± 9.27^ac	0.02 ± 0.05^ac
	平均	0.11 ± 0.26^e	2.26 ± 2.22^e	4.60 ± 3.13^e	39.59 ± 14.51^e	45.52 ± 10.17^e	7.89 ± 7.66^e	0.03 ± 0.08^e
抛物线形沙丘	迎风坡	0.19 ± 0.24^ac	3.80 ± 2.60^ac	4.65 ± 4.12^ac	31.17 ± 14.19^ad	44.90 ± 7.50^ac	14.97 ± 12.81^ad	0.34 ± 0.83^ac
	丘顶	0.19 ± 0.28^ac	2.83 ± 2.85^ad	5.03 ± 3.34^ac	35.39 ± 15.10^ad	43.80 ± 8.28^ad	12.27 ± 12.56^abd	0.49 ± 1.91^ad
	背风坡	0.25 ± 0.36^ac	3.85 ± 4.50^ac	5.10 ± 3.90^ac	38.65 ± 13.03^ac	44.38 ± 7.93^ac	7.74 ± 7.93^bc	0.02 ± 0.08^ac
	平均	0.21 ± 0.27^e	3.49 ± 3.01^e	4.92 ± 3.20^e	35.07 ± 12.42^e	44.36 ± 6.50^e	11.66 ± 9.56^e	0.28 ± 0.80^e