Journal article

CORONA TEXTURES BETWEEN KYANITE, GARNET AND GEDRITE IN GNEISSES FROM ERRABIDDY, WESTERN-AUSTRALIA

J BAKER, R POWELL, M SANDIFORD, J MUHLING

JOURNAL OF METAMORPHIC GEOLOGY | BLACKWELL SCIENCE INC | Published : 1987

Abstract

Abstract Corona textures, which developed in alternating layers in rocks in a supracrustal belt at Errabiddy, Western Australia, involved: (a) The production of staurolite, cordierite and quartz or sapphirine between Kyanite and/or sillimanite and gedrite; and (b) The production of cordierite between garnet and gedrite. These textures are inconsistent with development along the same pressure–temperature path in the system FeO–MgO–Al2O3–SiO2–H2O, but can be accounted for if CaO, mainly in garnet, is taken into account. The sapphirine‐bearing kyanite–gedrite textures are explained by lower a(SiO2) during their development. The assemblages indicate a consistent pressure–temperature (P–T) trajec..

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