Late Neoarchean thick-skinned thrusting and Paleoproterozoic reworking in the MacQuoid supracrustal belt and Cross Bay plutonic complex,western Churchill Province,Nunavut, Canada |
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| Institution: | 1. Geosciences Dept., U Texas at Dallas, Richardson, TX 75083-0688, USA;2. Faculty of Earth Sciences, King Abdulaziz University, Jeddah, Saudi Arabia;3. Dept. Geosciences, University of Nevada, Las Vegas, Las Vegas, NV 89154-4010, USA;4. Department of Geology, The University of Jordan, P.O. Box 13633, 11942 Amman, Jordan;5. GFZ German Research Centre for Geosciences, Potsdam, D-14473, Germany;6. Department of Earth Sciences and Mineral Exploration Research Centre, Laurentian University, Sudbury, ON P3E 2C6, Canada;7. Department of Geosciences, Swedish Museum of Natural History, Stockholm, SE-104 05, Sweden;8. Department of Earth Sciences and Environment, The Hashemite University, Zarqa, Jordan;1. Institut de Physique du Globe – Sorbonne Paris Cité, Université Paris Diderot, CNRS, 1 rue Jussieu, F-75238 Paris, France;2. Centre for Exploration Targeting, University of Western Australia, 35 Stirling Highway, Crawley 6009 WA, Australia;3. Laboratoire des Sciences du Climat et de l''Environnement, CNRS-CEA, CEA Saclay, Orme des Merisiers, F-91190 Gif sur Yvette, France;1. Lab. de Géodynamique, Géologie de l’Ingénieur et de Planétologie, FSTGAT-U.S.T.H.B., B.P. 32 El Alia, Dar el Beida, 16111 Alger, Algeria;2. IPGP, 1 rue Jussieu, 75238 Paris Cedex 05, France;3. Geodynamics and Mineral Resources, Royal Museum for Central Africa, B-3080 Tervuren, Belgium;1. Department of Geology, University of Georgia, Athens, GA 30602, USA;2. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA;3. Lunar and Planetary Institute, Houston, TX 77058, USA;4. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA;1. GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, 14473, Germany;2. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA;3. CERMES – Laboratoire Navier Ecole des Ponts Paros Teche, 6-8 Av. Blaise Pascal, Cite Descartes Champs sur Marne, 77455, Marne la Vallee Cedex 2, France;1. National Taiwan Normal University, Department of Earth Science, 88 Tingzhou Road Section 4, Taipei 11677, Taiwan;2. Chinese Petroleum Corporation-Taiwan, Exploration and Development Research Institute, Wen Fa Road, Miaoli 36042, Taiwan;3. Academia Sinica, Institute of Earth Science, 128 Academia Road Section 2, Nankang, Taipei 11529, Taiwan |
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| Abstract: | In the western Churchill Province, Canadian Shield, Neoarchean supracrustal and plutonic rocks, intruded by Paleoproterozoic mafic dykes and granitic rocks, comprise the MacQuoid supracrustal belt and the structurally overlying Cross Bay plutonic complex. They form part of the northwestern Hearne subdomain that occupies an intermediate position between the continental Rae domain to the north and west, and the oceanic central Hearne subdomain to the south and east. New geological mapping and supporting geoscience are compatible with the presence of 2550–2500 Ma, southeast-directed, mid-crustal, thick-skinned thrusting that juxtaposed the plutonic complex over the supracrustal belt. The structural contact between the MacQuoid supracrustal belt and the Cross Bay plutonic complex potentially represents a fundamental boundary between isotopically distinct crustal blocks.The ～2190 Ma MacQuoid mafic dyke swarm cuts across Neoarchean deformation fabrics, but records ～1.9 Ga, deep-crustal, regional metamorphism that affected both the supracrustal belt and the plutonic complex. Other Paleoproterozoic deformation events that occurred at ～1850–1810 Ma are of local extent and appear to be relatively minor manifestations of more important events elsewhere, related to the Trans-Hudson orogen. |
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