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S-type granite

A rock subtype
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Granitoid rocks derived from sedimentary source rocks, usually peraluminous, with muscovite and Al-rich minerals like garnet, cordierite and andalusite.

S-type is Sedimentary or Supracrustal; contrast with I-type granite, originating from remelting of deeper seated mafic igneous rocks. They can intergrade if originating from mixed sources.

Relatively low sodium, Na2O normally <3.2% in rocks with approx. 5% K2O, decreasing to <2.2% in rocks with approx. 2% K2O
Mol. Al2O3/(Na2O + K2O + CaO) > 1.1
>1.1 CIPW normative corundum
Relatively restricted in composition to high SiO2 types
Variation diagrams more irregular


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Unique IdentifiersHide

Mindat ID:
48130
Long-form identifier:
mindat:1:1:48130:8

Similar NamesHide

A-type graniteA rock subtype
C-type graniteA rock subtype
I-type graniteA rock subtype
M-type graniteA rock subtype

Classification of S-type graniteHide

QAPF_P_2,3,4,5.png

Rocks in sections 2,3,4 and 5 of the QAPF diagram.

Mineralogy of S-type graniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
FeldsparA petrological term for Feldspar Group.
Silica > QuartzSiO2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AndalusiteAl2(SiO4)O
CordieriteMg2Al4Si5O18
Garnet GroupX3Z2(SiO4)3
Mica > MuscoviteKAl2(AlSi3O10)(OH)2

Internet Links for S-type graniteHide

References for S-type graniteHide

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