摘要
Frost等主要依据花岗岩类常量元素分析,考虑铁镁指数,修改的碱钙指数(MALI)和铝饱和指数三个参数,将花岗岩类岩石划分为16个成分组,即16种类型。该分类方案能对岩浆来源和大地构造背景提供信息,基本上保留了以前一些花岗岩分类方案的最佳品质。本文对这个分类方案进行了详细介绍,并对各种花岗岩类分类方案进行了简要评述。
On the basis of the analytic data of the invariable elements for granitic rocks, Frost et al. (2001) divided the spectrum of granitoid compositions into 16 compositional groups or 16 granitoid types. They used 3 chemical parameters of the rocks including the FeO/(Feo + MgO) or FeOt/(FeOt+ MgO) ratio, the modified alkali-lime index ( MALI ) and the aluminum saturation index ( ASI ). The classification is a non-genetic and non-tecctonic geochemical scheme and can supply some knowledge of the sources of the magma or tectonic environment for a suite that incorporates the best qualities of the previons schemes. This paper make an exhaustive introduction for the classification scheme and give a review for the relevant subjects.
出处
《华南地质与矿产》
CAS
2004年第1期55-63,共9页
Geology and Mineral Resources of South China
