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Metamorphic-Metasomatic Fluids and Al, Si Order/Disorder of K-Rich Alkali Feldspars from Southern Indian High Grade Terrain
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The structural state of K-feldspars in the quartzofeldspathic gneisses, charnockites, metapelites and pegmatites from the southern Karnataka, northern Tamil Nadu and southern Kerala high-grade regions of southern India has been characterized using petrographic and powder X-ray diffraction methods. The observed distribution pattern of structural state with a preponderance of disordered K-feldspar polymorphs in granulites compared to the ordered microclines in the amphibolite facies rocks is interpreted to reflect principally the varying H2O contents in the metamorphic-metasomatic fluids across metamorphic grade. The K-feldspars in the pegmatites of granitic derivation and in a pegmatite of inferred metamorphic origin also point to the important role of aqueous fluids in their structural state.
Keywords
X-ray Diffraction, Amphibolite Facies, Granulites, Metamorphic-Metasomatic Fluids.
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