Abstract
AbstractThe Rocky Beach Metamorphic Melange contains metre-scale phacoids of high-Plow-Tmetamorphic 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-apaite, M2= almandine-omphacite-lawsonite ±quartz, M3= phengite- glaucophane-K-feldspar-quartz, and M4= chlorite-actinolite-calcite-quartz-titanite-white mica ± albite ± talc. M1-M3occurred 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.
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