[1]XIONG Pingsheng,YUAN Hang.Characteristics of Grain Size and Weathering Intensity of Collapsing Erosion Profile in Granite Weathering Crust[J].Research of Soil and Water Conservation,2018,25(02):157-161.
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Characteristics of Grain Size and Weathering Intensity of Collapsing Erosion Profile in Granite Weathering Crust
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 02
Page number:
157-161
Column:
Public date:
2018-04-03
- Title:
- Characteristics of Grain Size and Weathering Intensity of Collapsing Erosion Profile in Granite Weathering Crust
- Keywords:
- granite weathering crust; collapsing hill erosion; weathering intensity; grain size composition
- CLC:
- S157.1;S152
- DOI:
- -
- Abstract:
- Collapsing hill erosion profile of granite weathering crust was analyzed by combining the grain size method and chemical weathering index method. The results showed that:(1) the silt gravel component was the highest, whose the average value is 52.52%, the sand gravel component was 38.38%, the lowest clay gravel component was 9.09%. The silt gravel component (4~63 μm) was correlation with fine clay gravel component (< 1 μm) and clay gravel component (< 4 μm), and the sand gravel component (> 63 μm) had the significant positive correlation with median gravel diameter, the sand gravel component (> 63 μm) had a significant negative correlation with fine clay gravel component (< 1 μm), the clay gravel component (< 4 μm), and the silt gravel component (4~63 μm). The coarse grain size combination of depth from 580 to 780 cm might be the original area of the collapse erosion; (2) chemical index of alteration (CIA), coefficient of weathering leaching (BA), eluvial coefficient (Ki) and alkali index (Bc) show that the chemical weathering degree of collapse hill erosion profile was high; the weathering intensity shows a trend of slightly decreasing and then increasing from the bottom to the top of profile; (3) the correlation among chemical weathering parameters and particle size shows that when chemical weathering intensity enhances, the components of the fine clay gravel (< 1 μm), the clay gravel (< 4 μm) and the silt gravel (4~63 μm) should increase, while that of sand gravel component (> 63 μm) would decreae; when the chemical weathering intensity reduces, the component of the fine clay gravel (< 1 μm), the clay gravel (< 4 μm) and the silt gravel (4~63 μm) should decrease, the sand gravel (> 63 μm) component would increase.
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1900-01-01