| Desert and Desertification |
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| Grain-size Characteristics of the Deposits from Yardang Landforms in the Charhan Salt Lake Area |
| LI Ji-yan1, DONG Zhi-bao1,2, LI En-ju1, BAO Feng1, YANG Ning-ning1 |
1.College of Tourism and Environment, Shaanxi Normal University, Xi’an 710062, China;
2.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, China Academy of Sciences, Lanzhou 730000, China |
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Abstract The sediments from yardang landforms bear rich information about sedimentary environment. This paper mainly adopts granularity analysis method to study the deposits from yardang landforms in the Charhan Salt Lake area, Qinghai, China. Results indicate:（1） Main components of the deposits are silt sand, very fine sand, clay and fine sand.（2） There are 4 types of grain size distribution curves, namely asymmetric bimodal, near-symmetric bimodal, and unimodal. The main peak and the secondary peaks of the bimodal distribution curves appear in silt sand fraction and very fine sand fraction, respectively, and the only difference is the contents of the two fractions; （3）The mean size of the deposits ranges from 3.95 Φ to 7.18 Φ, and the mean value is 5.97 Φ; the standard deviation varies from 1.37 to 2.47, and the mean value is 1.99; the skewness ranges from -0.27 to 0.58, and the mean value is 0.10; the kurtosis varies from 0.71 to 1.28, and the mean value is 0.93. According to Sahus discrimination formula and the characters of both the grain size composition and distribution curves, it is found that the main sedimentary deposits are formed in lacustrine environment, lakeshore environment and fluvial environment, delta environment, as well as turbidity environment and a few aeolian environment. The sedimentary environments of the deposits are very complex.
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Received: 10 March 2012
Published: 20 September 2012
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2012, Vol. 32 
