西藏定结地区不同类型沙丘表层沉积物粒度特征及其环境意义

doi:10.12118/j.issn.1000－6060.2023.374

摘要/Abstract

摘要：

为了探讨粒度特征所指示的环境意义，对西藏定结地区现代沙丘进行采样，分析不同类型沙丘表层沉积物的粒度特征。结果表明：（1）流动沙丘和爬坡沙丘粒度组成相似，灌丛沙堆与二者粒度组成差异较大。流动沙丘和爬坡沙丘表层沉积物主要以细砂和中砂为主，而灌丛沙堆表层沉积物以极细砂、细砂和粉砂为主。（2）不同类型沙丘粒度参数呈现不同变化趋势，流动沙丘和爬坡沙丘表层沉积物分选较好，近对称，中等尖锐，灌丛沙堆表层沉积物分选中等，正偏，很尖锐。（3）流动沙丘和爬坡沙丘频率分布曲线呈近似对称的单峰分布，灌丛沙堆频率分布曲线呈双峰分布；不同类型沙丘表层沉积物概率累积曲线差异较为明显。（4）不同类型沙丘表层沉积物沉积环境主要以风成沉积为主，少数为河流沉积。（5）不同类型沙丘表层沉积物粒度特征对比可知，粒度特征的差异主要是沙源、植被覆盖度和风况共同作用的结果。

关键词: 沙丘, 表层沉积物, 粒度特征, 环境意义, 定结地区

Abstract:

To explore the environmental significance of grain size characteristics, modern dunes in the Dinggye area of Xizang, China were sampled to analyze the grain size characteristics of surface sediments from different types of dunes. The results are as follows: (1) The grain size composition was similar between mobile and climbing dunes, and the grain size composition differed significantly between nebkha and the two dune types. The surface sediments of mobile and climbing dunes were dominated by fine and medium sands, whereas those of nebkha were dominated by very fine sand, fine sand, and powdery sands. (2) The grain size parameters of these dunes showed different trends, with the surface sediments of mobile and climbing dunes well sorted, nearly symmetrical, and moderately sharp, and those of nebkha moderately sorted, positively skewed, and very sharp. (3) The frequency distribution curves of mobile and climbing dunes are nearly symmetrical and single-peaked, whereas those of nebkha are bimodal; the differences in the probability accumulation curves of the surface sediments of these dunes are more obvious. (4) The deposition environment of the surface sediments of these dunes is mainly dominated by wind-formed deposition, with a few river deposits. (5) A comparison of particle size characteristics of the surface sediments of these dunes shows that the differences in particle size characteristics are mainly because of the joint action of sand source, vegetation cover, and wind conditions.

Key words: dunes, surface sediments, grain-size characteristics, environmental significance, Dinggye area

龚逸夫, 潘美慧, 李娜, 郝泽文, 陈有桂, 李晨露. 西藏定结地区不同类型沙丘表层沉积物粒度特征及其环境意义[J]. 干旱区地理, 2024, 47(4): 588-598.

GONG Yifu, PAN Meihui, LI Na, HAO Zewen, CHEN Yougui, LI Chenlu. Grain size characteristics and environmental significance of different types of dune surface sediments in the Dinggye area, southern Xizang[J]. Arid Land Geography, 2024, 47(4): 588-598.

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沙丘名称	Y₁	Y₂	Y₃	Y₄	沉积环境
LDSQ1	-2.5891	76.6935	-3.1957	-	浅海沉积
LDSQ2	-3.5028	-	-	-	风成沉积
LDSQ3	-3.0650	-	-	-	风成沉积
LDSQ4	-2.9754	-	-	-	风成沉积
LDSQ5	-3.1248	-	-	-	风成沉积
LDSQ6	-3.4647	-	-	-	风成沉积
LDSQ7	-3.1699	-	-	-	风成沉积
GCSD1	-4.1069	-	-	-	风成沉积
GCSD2	-3.9026	-	-	-	风成沉积
GCSD3	-5.2942	-	-	-	风成沉积
GCSD4	-4.6130	-	-	-	风成沉积
GCSD5	-3.5971	-	-	-	风成沉积
GCSD6	-3.3971	-	-	-	风成沉积
GCSD7	-3.3136	-	-	-	风成沉积
GCSD8	-1.8223	164.1091	-10.3273	13.3543	河流沉积
PPSQ1	-3.4693	-	-	-	风成沉积
PPSQ2	-3.0643	-	-	-	风成沉积
PPSQ3	-3.7797	-	-	-	风成沉积
PPSQ4	-3.9422	-	-	-	风成沉积
PPSQ5	-3.0637	-	-	-	风成沉积
PPSQ6	-1.3442	86.0385	-5.0187	-	浅海沉积
PPSQ7	-5.9511	-	-	-	风成沉积