Journal article

SOME CAUSES AND CONSEQUENCES OF HIGH-TEMPERATURE, LOW-PRESSURE METAMORPHISM IN THE EASTERN MT LOFTY-RANGES, SOUTH AUSTRALIA

M SANDIFORD, G FRASER, J ARNOLD, J FODEN, T FARROW

AUSTRALIAN JOURNAL OF EARTH SCIENCES | BLACKWELL SCIENCE PUBL AUSTR | Published : 1995

Abstract

Andalusite-, and sillimanite-bearing metapelites in the eastern Mt Lofty Ranges preserve evidence for mineral equilibration during convergent deformation at temperatures near 550-600°C and pressures of 300-500 MPa, with lateral gradients in peak temperature of about 10°C/km near the first appearance of fibrolitic sillimanite (i.e. the sillimanite-in isograd). The high-temperature portion of the metamorphic history appears to have been nearly isobaric and the inferred geometry of isograd pattems apparently established during the deformation suggests the duration of deformation to be in the range 0.3-0.3+0.7 million years. These factors imply that the thermal perturbation responsible for peak ..

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