A Geochemical Classification for Granitic Rocks
2001/11/01 by B. RONALD FROST, Calvin G. Barnes, CALVIN G. BARNES +8 · 24 citations
Earth and Planetary Sciences · Computer Science · Chemistry · #Geological and Geochemical Analysis #Geochemistry and Geologic Mapping #Radioactive element chemistry and processing
paper · pdf · doi:10.1093/petrology/42.11.2033
Abstract
This geochemical classification of granitic rocks is based upon three INTRODUCTION variables. These are FeO/(FeO + MgO) = Fe-number [or Although granitoids are the most abundant rock types FeO tot /(FeO tot + MgO) = Fe * ], the modified alkali-lime index in the continental crust, no single classification scheme (MALI) (Na 2 O + K 2 O -CaO) and the aluminum saturation has achieved widespread use. Part of the problem in index
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