| 引用本文: | 徐则民1,2 黄润秋2. 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-min1,2, HUANG Run-qiu2. 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(in Chinese with English abstract). |
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| 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。 |
| 关键词: 峨眉山玄武岩 风化程度 化学风化指数 适宜性 |
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| 基金项目:国家自然科学基金-云南联合基金重点项目（U1033601）、国家自然科学基金面上项目(40572159, 40772189)、教育部高等学校博士点基金项目(20060674009)及地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2007-1, GZ2009-10)资助成果。 |
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| The assessment of the weathering intensity of Emeishan basalt based on rock blocks（Ⅲ）：Assessment of existing chemical weathering indices |
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XU Ze-min1,2, HUANG Run-qiu21,2
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1. Department of Civil Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China;2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, Sichuan, China
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| 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. |
| Key words: Emeishan basalt weathering degree chemical weathering index suitability |
