Peraluminous S Type Granite
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With respect to aluminium s type granites are always peraluminous or have a total alkali.
Peraluminous s type granite. Peraluminous granites can be produced either by partial melting of metasedimentary rocks s type or metaigneous rocks i type which has been well documented by experimental petrology e g. Therefore the presence of muscovite alone. S type granite this type is of sedimentary origin paraorigin from anatexis of sedimentary rocks with high al2o3 and low sio2 content ex. Peralumino us granite s can be produce d either by pa rtial melti ng of metasedime ntary rocks s t ype or metaigne ous rocks i ty pe which has been well documented by expe rimental petrology.
As a consequence of the lower na and ca contents the s type granites are always oversaturated in al or peralu minous and that is the case also for the more felsic i type granites. 3 i type granites show a gradual change from metaluminous to peraluminous composition with increasing sio 2 whereas s type granites display either constant values or slight decrease with increasing sio 2 ascribed to. Magma type is usually peraluminous magma al2o3 na2o k2o cao. While apatite inclusions are common they are not as abundant or large as apatites in s type granites.
Those rocks are therefore always saturated in al or peraluminous. Clemens and stevens 2012 patiño douce 1999. Iron and magnesium content correlate with color index in s type granites. The rock formed in this type is called tronjhomite or plagio granite.
Primary muscovite can occur in weakly peraluminous fractionated i type granites. These granites have been called s type chappell white 1974 syn collisional granitoids pearce et al 1984 continental collision granitoids maniar piccoli 1989 and muscovite peraluminous granites barbarin 1999.
