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subsolvus granite


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An igneous rock of granitic composition characterized by the presence of two types of alkali feldspar: a potassium-rich type displaying perthitic (see perthite) texture; and a sodium-rich type displaying antiperthitic texture. Subsolvus granites have a high water content, which depresses their liquidii sufficiently to intersect the subsolidus solvus surface and cause two extremes of feldspar composition to crystallize from the melt, instead of one intermediate-composition feldspar as in hypersolvus granites.

Subjects: Earth Sciences and Geography.


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