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    徐则民, 黄润秋. 基于结构体的峨眉山玄武岩风化程度评价(Ⅲ)——既有风化指数评价[J]. 中国地质, 2013, 40(5): 1655-1665.
    引用本文: 徐则民, 黄润秋. 基于结构体的峨眉山玄武岩风化程度评价(Ⅲ)——既有风化指数评价[J]. 中国地质, 2013, 40(5): 1655-1665.
    XU Ze-min, HUANG Run-qiu. The assessment of the weathering intensity of Emeishan basalt based on rock blocks(Ⅲ):Assessment of existing chemical weathering indices[J]. GEOLOGY IN CHINA, 2013, 40(5): 1655-1665.
    Citation: XU Ze-min, HUANG Run-qiu. The assessment of the weathering intensity of Emeishan basalt based on rock blocks(Ⅲ):Assessment of existing chemical weathering indices[J]. GEOLOGY IN CHINA, 2013, 40(5): 1655-1665.

    基于结构体的峨眉山玄武岩风化程度评价(Ⅲ)——既有风化指数评价

    The assessment of the weathering intensity of Emeishan basalt based on rock blocks(Ⅲ):Assessment of existing chemical weathering indices

    • 摘要: 提要:以峨眉山玄武岩核心区7个区域的13个具有壳核结构的玄武岩结构体为基础,对主要风化指数的适宜性进行了研究。18个风化指数均不适合于风化初期的峨眉山玄武岩风化程度评价。能够指示风化中后期峨眉山玄武岩风化程度的指数包括Parker指数、BA1、BA、BA3、BA2、碱/铝指数、碱/倍半氧化物指数、WPI、SA、SF、Kr、硅/倍半氧化物、CIW、CIA及LOI,其中更为合理的是碱/铝指数、碱/倍半氧化物指数和硅/倍半氧化物。17个风化指数中,指示性最差的是A、B和B1。Fe2O3控制着风化初期峨眉山玄武岩碱/倍半氧化物指数、SF、Kr及硅/倍半氧化物的变化,应成为风化程度评价需要考虑的重要因素。

       

      Abstract: Abstract: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/R2O3 ratio, WPI, SA, SF, Kr, silicate/R2O3 ratio, CIW, CIA and LOI, in which, alkali/alumina ratio, alkali/R2O3 ratio and silicate/R2O3 ratio are more reasonable, while A, B and B1 are the worst. Fe2O3 that controls the alkali/R2O3 ratio, SF, Kr and silicate/R2O3 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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