A Geochemical Classification for Granitic Rocks
This geochemical classification of granitic rocks is based upon three variables. These are FeO / (FeO + MgO) = Fe-number [or FeOtot / (FeOtot + MgO) = Fe*], the modified alkali-lime index (MALI) (Na2O + K2O - CaO) and the aluminum saturation index (ASI) [Al/(Ca - 1.67P + Na + K)]. The Fe-number (or Fe*) distinguishes ferroan granitoids, which manifest strong iron enrichment, from magnesian granitoids, which do not. The ferroan and magnesian granitoids can further be classified into alkalic,...[Show more]
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|Source:||Journal of Petrology|
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