Shear zone evolution and timing of deformation in the Neoproterozoic transpressional Dom Feliciano Belt,Uruguay |
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| Affiliation: | 1. Geoscience Center, Georg-August-Universität Göttingen, Göttingen, Germany;2. Departamento de Geología, Facultad de Ciencias, Universidad de la República, Montevideo, Uruguay;3. Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany;4. Technische Universität Bergakademie Freiberg, Freiberg, Germany;5. Instituto de Geociências, Universidade de São Paulo, São Paulo, Brazil;1. Universidad Nacional de Río Cuarto, CONICET, Departamento de Geología (Ruta Nac. n° 36 km 601), Río Cuarto, Argentina;2. School of Earth, Atmosphere and Environment, Monash University, Clayton, VIC 3800, Australia;3. Universidad Nacional de la Plata, CIG-CONICET, Diagonal 113 64, 1900 La Plata, Argentina;4. Departamento de Geodinámica, Universidad del País Vasco (UPV/EHU), Apartado 644, Bilbao, Spain;1. Programa de Pós-graduação em Geociências, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçavels, 9500, Porto Alegre, 91500-000, Brazil;2. Department of Geosciences, UiT The Arctic University of Norway in Tromsø, Dramsveien 201, 9037, Tromsø, Norway;1. The Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing, 100871, China;2. Geosciences Department, University of Arizona, Tucson, 85716, USA;3. Institute of Crustal Dynamics, China Earthquake Administration, Beijing, 100085, China;4. School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China;1. Department of Geology, University of the Free State, 205 Nelson Mandela Drive, 9300, Bloemfontein, Free State, South Africa;2. Department of Lithospheric Research, Faculty of Earth Sciences, Geography and Astronomy, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria;3. Department of Earth, Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, L69 3GP, Liverpool, United Kingdom |
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| Abstract: | New structural, microstructural and geochronological (U-Pb LA-ICP-MS, Ar/Ar, K-Ar, Rb-Sr) data were obtained for the Dom Feliciano Belt in Uruguay. The main phase of crustal shortening, metamorphism and associated exhumation is recorded between 630 and 600 Ma. This stage is related to the collision of the Río de la Plata and Congo cratons at ca. 630 Ma, which also involved crustal reworking of minor crustal blocks such as the Nico Pérez Terrane and voluminous post-collisional magmatism. Subsequent orogen-parallel sinistral shearing gave rise to further deformation up to ca. 584 Ma and resulted from the onset of the convergence of the Kalahari Craton and the Río de la Plata-Congo cratons. Sinistral shear zones underwent progressive strain localization and retrograde conditions of deformation during crustal exhumation. Dextral ENE-striking shear zones were subsequently active at ca. 550 Ma, coeval with further sinistral shearing along N- to NNE-striking shear zones. The tectonothermal evolution of the Dom Feliciano Belt thus recorded the collision of the Río de la Plata and Congo cratons, which comprised one of the first amalgamated nuclei of Gondwana, and the subsequent incorporation of the Kalahari Craton into Western Gondwana. |
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| Keywords: | Brasiliano–Pan-African Orogeny Río de la Plata Craton Oblique collision Transpression Strain partitioning Gondwana |
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