Abstract
The age of high-temperature granulite-facies metamorphism (>~800–850 °C) in the Rauer Group, Prydz Bay, east Antarctica, is relevant for establishing the metamorphic and temporal architecture of the Prydz Bay mobile belt. Monazites within Al-Mg-rich granulite-facies metapelites give an overall tanh-estimated Pan-African age of ~511±4 Ma (2σ) using in-situ electron microprobe-based (Th+U)-Pb chronology, consistent with existing U-Pb zircon geochronology from the Rauer Group and Prydz Bay. Monazite occurs primarily within cordierite-bearing coronae and symplectic mineral reaction textures, and also within biotite. Pan-African granulite-facies metamorphism is preferred as responsible for the development of the cordierite-bearing microstructures, and probably (peak) coarse-grained assemblages, constrained using an integrated geologic, geochronologic and metamorphic framework. Thus, Pan-African granulite-facies metamorphism affected the Rauer Group, within the Prydz Bay mobile belt. Moreover, integrated monazite geochronology may be used to decipher the temporal metamorphic histories of potentially complex high-temperature terrains.
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Acknowledgements
The Australian Antarctic Division and Australian National Antarctic Research Expeditions (ANARE) are thanked for providing logistical support to collect the samples during the 1999–2000 and 2000–2001 austral summers, under the guise of ASAC Project 1129 awarded to C.J.L.W. D.E.K thanks Cameron Quinn for his wisdom in the field. Martin Hand and an anonymous reviewer are thanked for constructive reviews. The University of Melbourne scholarships office is thanked for providing a contribution towards the research. D.E.K is supported by an Australian Postgraduate Award.
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Kelsey, D.E., Powell, R., Wilson, C.J.L. et al. (Th+U)-Pb monazite ages from Al-Mg-rich metapelites, Rauer Group, east Antarctica. Contrib Mineral Petrol 146, 326–340 (2003). https://doi.org/10.1007/s00410-003-0497-3
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DOI: https://doi.org/10.1007/s00410-003-0497-3