(Th+U)-Pb monazite ages from Al-Mg-rich metapelites,Rauer Group,east Antarctica |
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Authors: | Email author" target="_blank">D?E?KelseyEmail author R?Powell C?J?L?Wilson D?A?Steele |
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Institution: | (1) School of Earth Sciences, University of Melbourne, 3010 Victoria, Australia;(2) Central Science Laboratory, University of Tasmania, Private Bag 74, 7001 Hobart, Tasmania , Australia |
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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 (2) 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.Electronic Supplementary Material Supplementary material is available for this article if you access the article at . A link in the frame on the left on that page takes you directly to the supplementary material.Editorial responsibility: B. Collins |
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