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.
花岗岩风化壳崩岗侵蚀剖面风化强度和粒度分布特征
- 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
- 分类号:
- S157.1;S152
- 摘要:
- 结合粒度法和化学风化指标法分析了花岗岩风化壳崩岗侵蚀剖面，结果显示：（1）粒度组成以粉砂砾组分最多，平均值为52.52%，砂砾组分为38.38%，黏粒组分最少，平均值为9.09%。4~63 μm粉砂粒组分分别与<1 μm细黏粒组分、<4 μm黏粒组分正相关性较好；>63 μm的砂砾组分与中值砾径呈显著正相关性，与<1 μm细黏粒组分、<4 μm黏粒组分、4~63 μm粉砂粒组分呈显著的负相关性。剖面580~780 cm深度可能是崩岗侵蚀起源区域。（2）化学蚀变指数CIA、风化淋溶系数BA、残积系数Ki和退碱系数Bc一致表明，崩岗侵蚀剖面的化学风化程度高。风化强度从底部往上呈现先小幅度递减而后波动递增的变化趋势。（3）风化参数指标和粒度线性相关性分析得知，化学风化作用强度增强，<1 μm细黏粒组分、<4 μm黏粒组分、4~63 μm粉砂粒组分增加，>63 μm砂砾组分减少。化学风化作用减弱，<4 μm黏粒组分、4~63 μm粉砂粒组分减少，>63 μm砂砾组分增多。
- 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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相似文献/References:
[1]张萍,查轩.崩岗侵蚀研究进展[J].水土保持研究,2007,14(01):170.
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[2]廖凯涛,刘 艳,刘 荃,等.赣州市崩岗侵蚀分布特征与影响因子分析[J].水土保持研究,2021,28(06):126.
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备注/Memo
收稿日期:2017-5-15;改回日期:2017-6-16。
基金项目:湖南省自然科学基金（2016JJ6015）；国家自然科学基金（41471153）；衡阳师范学院样科学基金项目（15B10）
作者简介:熊平生(1972-),男,湖南永州人,副教授,博士,主要从事第四纪地质学研究。E-mail:xps19721010@163.com