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Mineralogical Magazine; August 2003; v. 67; no. 4; p. 609-624; DOI: 10.1180/0026461036740121
© 2003 Mineralogical Society of Great Britain and Ireland
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Blueschist and eclogite in tectonic melange, Port Macquarie, New South Wales, Australia

D. J. Och1,*,{dagger}, E. C. Leitch1, G. Caprarelli1 and T. Watanabe2,{ddagger}

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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