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| Grain Size Characteristics and Its Environmental Significance of the Amdo Profile in Tibet, China |
| Huang Wenmin1, Wu Yongqiu1, Pan Meihui2, Zhang Jianfeng1, Du Shisong1 |
1. MOE Engineering Center of Desertification and Blown-sand Control/Ministry of Civil Affairs & Ministry of Education Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China;
2. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China |
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Abstract By analyzing the grain size component, traditional grain size parameters and volume fractal dimensions of three different layers of the Amdo profile in Tibet of China and two modern mobile sand dunes, the grain characteristics and environmental significance of the Amdo profile are discussed. The results showed that the three layers represent three different climatic phases. The first layer (0-172 cm) deposits of the Amdo profile are aeolian origin and the wind has strengthened at depth of 44-108 cm. Sediments grain size curves of the second layer (172-224 cm) and the third layers (224-232 cm) show that almost all samples have a second peak at 6 Φ, that means the increasing of the suspension component and a long distance transportation of silt particle sedimentation, indicating the weakening of wind force in this phases. Compared with the modern mobile sand dunes, all the samples from the Amdo profile are finer, which imply that the Amdo profile is likely to be a fixed dune or semi-fixed dune. Fractal dimension (D) of all the studied samples is 0.215-1.77, losing physical meaning in Euclidean 3D space, but the D value is still significant to indicate the environmental change. Volume fractal dimensions have a notable positive correlation with the content of clay and slit, negatively correlated with the content of fine sand.
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Received: 17 June 2013
Published: 20 March 2014
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Corresponding Authors:
伍永秋（Email：yqwu@bnu.edu.cn）
E-mail: yqwu@bnu.edu.cn
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2014, Vol. 34 
