风化指数[weathering index (WI)]是描述岩石风化程度的岩石化学参数,由Par Rer(1970)提出,其公式为WI=［(Na)a0?35+(Mg)a0?9+(K)a0?29+(Ca)a0?7］×100式中：(Na)a、(Mg)a、(K)a、(Ca)a表示元素X的原子质量。函数中的分母是每个元素和氧之间键的强度。
将岩体块度指数、绝对风化指数在地质强度指标的区间范围概化表上有机结合起来，构成了GSI的定量确定方法。
Then, through organic combination of rock mass block index and absolute weathering index in the general sector scope table, the quantitative method of GSI is constituted.
同时，所有样品伊利石化学指数值均大于0.5，说明粘土矿物经历了强烈的化学风化作用，盆地内部为暖湿气候。
Chemical index of the illite samples is higher than 0.5, indicating that clay minerals had undergone strong chemical weathering and interior of the Basin had a relatively warm and wet climate.
流域盆地的风化作用指数由北向南逐渐增加，这与世界上其它地区十分相似。
Also, the weathering indices which is a ratio of the stable to active elements, increases from the north to south, indicating the control of weathering on river chemistry.
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