Formation of late sillimanite by hydrogen metasomatism (base-leaching) in some high-grade gneisses

R. H. Vernon

doi:10.1016/0024-4937(79)90045-8

Formation of late sillimanite by hydrogen metasomatism (base-leaching) in some high-grade gneisses

R. H. Vernon^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

Abstract

Microstructural evidence indicates that fibrolitic sillimanite partly replaced of the highest-grade metamorphic assemblage in the high-grade metapelitic gneisses, migmatites and granodiorite of the Cooma Complex, southeastern Australia. The sillimanite is interpreted as having formed by the action of mobile hydrogen ions on pre-existing minerals, base cations being released and removed from the sites of reaction. The hydrogen ions may have been liberated during widespread hydration of cordierite. The general base-leaching process may be applicable to the formation of late sillimanite in high-grade, migmatitic gneisses in other areas.

Original language	English
Pages (from-to)	143-152
Number of pages	10
Journal	Lithos
Volume	12
Issue number	2
DOIs	https://doi.org/10.1016/0024-4937(79)90045-8
Publication status	Published - 15 Apr 1979

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abstract = "Microstructural evidence indicates that fibrolitic sillimanite partly replaced of the highest-grade metamorphic assemblage in the high-grade metapelitic gneisses, migmatites and granodiorite of the Cooma Complex, southeastern Australia. The sillimanite is interpreted as having formed by the action of mobile hydrogen ions on pre-existing minerals, base cations being released and removed from the sites of reaction. The hydrogen ions may have been liberated during widespread hydration of cordierite. The general base-leaching process may be applicable to the formation of late sillimanite in high-grade, migmatitic gneisses in other areas.",

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N2 - Microstructural evidence indicates that fibrolitic sillimanite partly replaced of the highest-grade metamorphic assemblage in the high-grade metapelitic gneisses, migmatites and granodiorite of the Cooma Complex, southeastern Australia. The sillimanite is interpreted as having formed by the action of mobile hydrogen ions on pre-existing minerals, base cations being released and removed from the sites of reaction. The hydrogen ions may have been liberated during widespread hydration of cordierite. The general base-leaching process may be applicable to the formation of late sillimanite in high-grade, migmatitic gneisses in other areas.

AB - Microstructural evidence indicates that fibrolitic sillimanite partly replaced of the highest-grade metamorphic assemblage in the high-grade metapelitic gneisses, migmatites and granodiorite of the Cooma Complex, southeastern Australia. The sillimanite is interpreted as having formed by the action of mobile hydrogen ions on pre-existing minerals, base cations being released and removed from the sites of reaction. The hydrogen ions may have been liberated during widespread hydration of cordierite. The general base-leaching process may be applicable to the formation of late sillimanite in high-grade, migmatitic gneisses in other areas.

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Formation of late sillimanite by hydrogen metasomatism (base-leaching) in some high-grade gneisses

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