Assembly of Pampia to the SW Gondwana margin: A case of strike-slip docking? |
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| Authors: | Cecilia M Spagnuolo Augusto E Rapalini Ricardo A Astini |
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| Affiliation: | 1. Department of Geosciences, University of the Witwatersrand, Private Bag 3, 2050 Johannesburg, South Africa;2. Department of Geosciences, CEED, University of Oslo, PO Box 1047, Blindern, 0316 Oslo, Norway;1. School of the Earth Sciences and Resources, China University of Geosciences, Beijing, China;2. Dinosaur Trackers Research Group, University of Colorado, Denver, CO, USA;3. Regional Geological Survey Team, Sichuan Bureau of Geological Exploration and Development of Mineral Resources, Chengdu 610213, China;4. School of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK;5. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China;6. Saurierwelt Paläontologisches Museum, Neumarkt, Germany;7. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada;8. Department of Earth Science Education, Korea National University of Education, Cheongwon, Chungbuk 363-791, South Korea;9. Zigong Dinosaur Museum, Zigong, Sichuan, China;10. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guilin 541004, China;1. Instituto de Estudios Andinos, CONICET-Universidad de Buenos Aires, Argentina;2. Aurum Consultores, Santiago, Chile;3. Instituto Volponi, Universidad de San Juan-CONICET, Argentina;4. Instituto Volponi, Universidad de San Juan, Argentina;5. Repsol S.A., Houston, TX, United States;6. IIDyPCa, CONICET - Universidad Nacional de Río Negro, Argentina;1. Universidade Federal do Rio Grande do SulAvda. Bento Gonçalves, 9500, 91540-000 Porto Alegre, Rio Grande do Sul, Brazil;2. CAPES Foundation, Ministry of Education of Brazil, SBN, Quadra 2, 70040-020 Brasília, DF, Brazil;3. Departamento de Geología, Universidad de Oviedo, C/ Arias de Velasco s/n, 33005 Oviedo, Spain;4. Universidade Federal de Pelotas, Praça Domingos Rodrigues 2, 96010-440 Pelotas, Rio Grande do Sul, Brazil |
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| Abstract: | Different hypotheses have been proposed to account for the geologic evolution of the southwestern margin of Gondwana in the Early Paleozoic, involving accretion and displacement of different terranes in a protracted convergent margin. In order to constrain and understand the kinematic and paleogeographic evolution of the Pampia terrane a paleomagnetic study was carried out in different Cambrian to Devonian units of the Eastern Cordillera (Cordillera Oriental) and the Interandean Zone (Interandino) of NW Argentina. Paleomagnetic poles from the Campanario Formation (Middle to Upper Cambrian): 1.5°N 1.9°E A95 = 9.2° K = 37.46 N = 8; and Santa Rosita Formation (Lower Ordovician): 8.6°N 355.3°E A95 = 10.1° K = 26.78 n = 9, representative of the Pampia terrane, are interpreted to indicate a Late Cambrian significant displacement with respect to the Río de la Plata and other Gondwana cratons. A model, compatible with several geological evidences that explains this displacement in the framework of the final stages of Gondwana assembly is presented. We propose a simple dextral strike-slip kinematic model in which Pampia and Antofalla (? Arequipa?) blocks moved during Late Cambrian times from a position at the present southern border of the Kalahari craton into its final position next to the Rio de la Plata craton by the Early Ordovician. |
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