Journal article

PETROGENESIS OF CORDIERITE-ORTHOAMPHIBOLE ASSEMBLAGES FROM THE SPRINGTON REGION, SOUTH-AUSTRALIA

J ARNOLD, M SANDIFORD

CONTRIBUTIONS TO MINERALOGY AND PETROLOGY | SPRINGER | Published : 1990

Abstract

Textural evidence for the partial breakdown of staurolite-biotite and andalusite-biotite assemblages to cordierite-orthoamphibole implies high temperature metasomatic depletion of K2O in semi-pelitic rocks from Springton, South Australia. The origin of the reaction textures is discussed with reference to μK2O-T diagrams derived from the topologically equivalent μK2O-(-μH2O) diagram showing both discontinuous and Fe-Mg continuous reactions. The involvement of fluids in the metasomatic process is implied by the scale of K2O removal and suggests that the outcrop pattern of cordierite-gedrite rocks reflects, at least in part, a heterogeneous distribution of advecting fluids in the metamorphic pi..

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