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| Laser Particle Size Analysis and Genesis of the Yellow Silt in the Coastal Area of South China |
| WANG Jing1, GAO Quan-zhou1*, CHEN Guo-neng2 |
1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China
2. School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China |
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Abstract A layer of yellow silt is widely distributed on the low hills and platforms in the coastal area of south China. Seven typical sections in the study area were analyzed using laser grain size analysis to determine the sedimentary characteristics and genesis of the yellow slit. The typical loess, marine and fluvial deposits were also adopted for contrastive study. The results showed that the yellow silt sections were all featured by the modal size group of coarse silt (10~50 μm) and the secondary grain size of clay (<5 μm), which were corresponding to the “basic grain size group” and “second grain size group” of the typical loess, and the lithology were clayed silt. Aeolian characteristics of the yellow silt were further indicated by grain size parameters, scatter diagrams, frequency distributional curves and grain size index. The result of grain size discriminant analysis was negative, also supporting an aeolian origin of the yellow silt. All of the grain size characteristics of the yellow silt and the sedimentary type and environment they reflected were comparable to that of the typical loess, but quite different from associated fluvial and marine deposits.
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Received: 2017-05-14
Accepted: 2017-09-30
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Corresponding Authors:
GAO Quan-zhou
E-mail: chengn@mail.sysu.edu.cn
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