The structural and tectonic evolution of a Rodinian continental fragment in the Mawson Escarpment,Prince Charles Mountains,Antarctica |
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| Authors: | Adrian F Corvino Christopher JL Wilson Steven D Boger |
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| Institution: | 1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China;2. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 10083, China;1. Department of Lithospheric Research, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria;2. Department of Geology, University of the Free State, Nelson Mandela Drive 205, Bloemfontein, 9300, South Africa;3. Geological Survey (Geologische Bundesanstalt) of Austria, Neulinggasse 38,Vienna, A-1030, Austria;4. Department of Geodynamics and Sedimentology, University of Vienna, Althanstrasse 14, Vienna, A-1090, Austria;5. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA;6. Helmholtz Centre Potsdam, German Research Centre for Geosciences, Telegrafenberg, Potsdam, 14473, Germany;1. School of Earth and Planetary Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;2. Department of Geology, University of Johannesburg, Auckland Park 2006, South Africa;3. Future Industries Institute, University of South Australia, Mawson Lakes, SA 5125, Australia;4. Guangdong Provincial Key Lab of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China;5. Centre for Exploration Targeting, School of Earth Sciences, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;6. Earth Research Institute, University of California, Santa Barbara, CA 93106, USA |
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| Abstract: | Part of East Antarctica's shield collided with Greater India during assembly of the Rodinia supercontinent. The pre-Rodinia continental margin of the Antarctic landmass is represented by Palaeoproterozoic basement rocks of the Lambert Complex, which are best exposed in the North Mawson Escarpment area of Antarctica's Prince Charles Mountains. Having investigated the structure of this escarpment, we conclude that rocks of the Lambert Complex were stacked by oblique northward overthrusting motions while deforming pervasively in the infrastructure zone of a convergent orogen, i.e. when this continental fragment of pre-Rodinia Antarctica collided with India around 960–905 m.y. ago. This resulted in exhumation to shallower, but still deep, crustal levels, so that the deformation was accompanied by Barrovian-type metamorphism that evolved to high-temperature, low-pressure conditions. The metamorphism outlasted most of the ductile deformation with temperatures reaching 750 °C, though potentially greater, under pressure conditions of about 5 kbar. In this paper we outline the structures and, from a plate tectonics viewpoint, consider their likely association with Rodinian and Gondwanan orogens in East Antarctica, i.e. the Rayner and Prydz Belts. |
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