A Geochemical Classification for Granitic Rocks

Carol D. Frost(University of Wyoming), Calvin G. Barnes(Texas Tech University), William J. Collins(University of Newcastle Australia), Richard Arculus(Australian National University), David J. Ellis(Australian National University), Carol D. Frost(University of Wyoming)
Journal of Petrology
November 1, 2001
Cited by 4,221Open Access
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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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