The Assessment of the Weathering Intensity of Emeishan Basalt Based on Rock Blocks (Ⅲ): Assessment of Existing Chemical Weathering Indices
详细信息
- 责任者：Xu Zemin (Department of Civil Engineering ; Kunming University of Science and Technology ; Kunming 650500 ; China) ; Huang Runqiu
- 刊名：Geology in China
- 出版年：2013
- 卷期：40(5)
- 关键词：峨眉山玄武岩 ; Emeishan Basalt ; 化学风化作用 ; chemical weathering ; 四川 ; Sichuan Province
- 页码：p.1655-1665
- 图表：7 illus., 6 refs.
- 分类号：0100
- issnNo：ISSN1000-3657
- isbnNo：CN11-1167/P
摘要
The suitability of main weathering indices has been studied based on 13 weathered basalt blocks with core-shell structure from 7 rock mass sections in the core area of Emeishan basalt. Poor correlation has been observed between 18 chemical weathering indices and the early-stage weathering grade of the Emeishan basalt. The indices that can be used to evaluate mid-late period weathering degree of the Emeishan basalt include Parker’s index, BA1, BA, BA3, BA2, alkali/alumina ratio, alkali/R2 O3 ratio, WPI, SA, SF, Kr, silicate/R2 O3 ratio, CIW, CIA and LOI, in which, alkali/alumina ratio, alkali/R2 O3 ratio and silicate/R2 O3 ratio are more reasonable, while A, B and B1 are the worst. Fe2 O3 that controls the alkali/R2 O3 ratio, SF, Kr and silicate/R2 O3 ratio in the initial weathering stage of Emeishan basalt should be regarded as an important factor to evaluate the weathering degree of Emeishan basalt.
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