A Geochemical Classification for Granitic Rocks
(a) FeO/(FeO + MgO) vs weight per cent SiO 2 diagram showing the boundary between ferroan plutons and magnesian plutons. Boundary is based upon compositions of 175 A-type granitoids from western North American, Baltica, Africa and Australia, and 344 granitoids of the Mesozoic batholiths of North America.
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