S-type granite

S-type granites are a category of granites first proposed in 1974.^[1] They are recognized by a specific set of mineralogical, geochemical, textural, and isotopic characteristics. S-type granites are over-saturated in aluminium, with an ASI index greater than 1.1 where ASI = Al₂O₃ / (CaO + Na₂O +K₂O) in mol percent;^[1]^[2]^[3] petrographic features are representative of the chemical composition of the initial magma as originally put forth by Chappell and White are summarized in their table 1.^[1]^[4]

^ ^a ^b ^c Chappell, B. W.; White, A. J. R. (August 2001). "Two contrasting granite types: 25 years later". Australian Journal of Earth Sciences. 48 (4): 489–499. Bibcode:2001AuJES..48..489C. doi:10.1046/j.1440-0952.2001.00882.x. ISSN 0812-0099. S2CID 33503865.
^ Zen, E. (1988-01-01). "Phase Relations Of Peraluminous Granitic Rocks And Their Petrogenetic Implications". Annual Review of Earth and Planetary Sciences. 16 (1): 21–51. Bibcode:1988AREPS..16...21Z. doi:10.1146/annurev.ea.16.050188.000321. ISSN 0084-6597.
^ Frost, B. R.; Frost, C. D. (2008-11-07). "A Geochemical Classification for Feldspathic Igneous Rocks". Journal of Petrology. 49 (11): 1955–1969. Bibcode:2008JPet...49.1955F. doi:10.1093/petrology/egn054. ISSN 0022-3530.
^ Chappell, B. W.; White, A. J. R. (August 2001). "Two contrasting granite types: 25 years later". Australian Journal of Earth Sciences. 48 (4): 489–499. Bibcode:2001AuJES..48..489C. doi:10.1046/j.1440-0952.2001.00882.x. ISSN 0812-0099. S2CID 33503865.

[:0-1] Chappell, B. W.; White, A. J. R. (August 2001). "Two contrasting granite types: 25 years later". Australian Journal of Earth Sciences. 48 (4): 489–499. Bibcode:2001AuJES..48..489C. doi:10.1046/j.1440-0952.2001.00882.x. ISSN 0812-0099. S2CID 33503865.

[2] Zen, E. (1988-01-01). "Phase Relations Of Peraluminous Granitic Rocks And Their Petrogenetic Implications". Annual Review of Earth and Planetary Sciences. 16 (1): 21–51. Bibcode:1988AREPS..16...21Z. doi:10.1146/annurev.ea.16.050188.000321. ISSN 0084-6597.

[3] Frost, B. R.; Frost, C. D. (2008-11-07). "A Geochemical Classification for Feldspathic Igneous Rocks". Journal of Petrology. 49 (11): 1955–1969. Bibcode:2008JPet...49.1955F. doi:10.1093/petrology/egn054. ISSN 0022-3530.

[:1-4] Chappell, B. W.; White, A. J. R. (August 2001). "Two contrasting granite types: 25 years later". Australian Journal of Earth Sciences. 48 (4): 489–499. Bibcode:2001AuJES..48..489C. doi:10.1046/j.1440-0952.2001.00882.x. ISSN 0812-0099. S2CID 33503865.

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