Frost B.R. et al. (2001): A Geochemical Classification for Granitic Rocks. Journal of Petrology 42, 2033-2048.
Table 1: A geochemical classification scheme for granitoids

Fe-no. or Fe*: magnesian
MALI: calcic calc-alkalic alkali–calcic alkalic
ASI: metaluminous
peraluminous
metaluminous
peraluminous
metaluminous
peraluminous
metaluminous
peralkaline
Rock types diorite, quartz diorite diorite, monzodiorite, monzonite, syenite monzonite, syenite, granite alkali fsp. syenite, alkali fsp. granite
tonalite   granodiorite   high K-granite  
Occurrences plutons on the outboard portions of Cordilleran batholiths, plutons in island arcs, plagiogranites plutons in the main portion of Cordilleran batholiths plutons inboard from Cordilleran batholiths,
plutons associated with delamination of overthickened crust
plutons inboard from Cordilleran batholiths
Examples La Posta pluton (Walawender et al., 1990) Cornucopia stock (Johnson et al., 1997) Tuolumne suite (Bateman & Chappell, 1979) N. Idaho batholith (Hyndman, 1984) Ben Nevis (Haslam, 1968) portions of the Vosges granites (Altherr et al., 2000) Yamato Mtns (Zhao et al., 1995) Shonkin Sag (Nash & Wilkinson, 1970)

Fe-no. or Fe*: ferroan
MALI: calcic calc-alkalic alkali–calcic alkalic
ASI: metaluminous
peraluminous
metaluminous
peraluminous
metaluminous
peraluminous
metaluminous
peralkaline
Rock types none known none knomn granite two-mica granite ferrodiorite, syenite, granite two-mica granite anorthosite, ferrodiorite, monzonite, granite alkaji gabbro, syenite, alkali granite
Occurrences     some A-type plutons, some granophyres in mafic plutons some A-type plutons A-type granites, granophyres associated with mafic dikes and plutons within-plate plutons, plutons in cores of alkalic volcanoes
Examples     Bunger Hills (Sheraton et al., 1792) some Lachlan A-type granites (King et al., 1997) Sherman batholith (Frost et al., 1989) St. Vrain, Silver Plume (Anderson & Thomas, 1985) Bjerkreim–Sokndal (Duchesne & Wilmart, 2997) Na series of Pikes Peak (Smith et al., 1999)

Adapted from Journal of Petrology Online