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Blueschist and eclogite in tectonic melange, Port Macquarie, New South Wales, Australia

D. J. Och^1,*,, E. C. Leitch¹, G. Caprarelli¹ and T. Watanabe^2,

¹ Environmental Sciences, University of Technology, Sydney, NSW 2007, Australia
² Earth and Planetary Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan, 060

^* E-mail: OchD{at}douglaspartners.com.au

The Rocky Beach Metamorphic Melange contains metre-scale phacoids of high-P low-T metamorphic rocks embedded in chlorite-actinolite schist. The phacoids include eclogite, glaucophane schist and omphacitite and provide evidence for four episodes of metamorphism with mineral assemblages: M₁ = actinolite-glaucophane-titanite-apatite, M₂ = almandine-omphacite-lawsonite ± quartz, M₃ = phengite-glaucophane-K-feldspar-quartz, and M₄ = chlorite-actinolite-calcite-quartz-titanite-white mica ± albite ± talc. M₁–M₃ occurred at a Neoproterozoic–Early Palaeozoic convergent plate boundary close to the eastern margin of Gondwana. Peak metamorphic conditions were attained during the static phase M₂, with temperatures of ~560°C and pressures in excess of 1.8 GPa, equivalent to a depth of burial of at least 54 km.

KEYWORDS: eclogite, blueschist, melange, high-P metamorphic rocks, Port Macquarie, New England Fold Belt, Australia

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