The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.

Autores
Oriolo, Sebastián; González, Pablo Diego; Schulz, Bernhard; Giacosa, Raúl Eduardo; Renda, Emiliano Manuel; Marcos, Paulo; Suárez, Rodrigo Javier; Ballivián Justiniano, Carlos; Christiansen, Rodolfo; Yoya, Belén; Restelli, Florencia; Basei, Miguel Ángel Stipp
Año de publicación
2021
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Fil: Oriolo, Sebastián. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
Fil: González, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Servicio Geológico Minero Argentino, Centro General Roca, Río Negro, SEGEMAR Regional Sur, Independencia 1495, Parque Industrial 1, Gral. Roca, (Río Negro), C. P. 8332, Casilla, Correo, Argentina.
Fil: Schulz, Bernhard. TU Bergakademie Freiberg, Institute of Mineralogy, Saxony, Alemania.
Fil: Giacosa, Raúl Eduardo. Servicio Geológico Minero Argentino, Centro General Roca, Río Negro, SEGEMAR Regional Sur, Independencia 1495, Parque Industrial 1, Gral. Roca, (Río Negro), C. P. 8332, Casilla, Correo, Argentina.
Fil: Renda, Emiliano Manuel. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Marcos, Paulo. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina. IIPG, UNRN, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Roca 1242, (R8332EXZ), General Roca, Río Negro, Argentina.
Fil: Suárez, Rodrigo Javier. IDEAN (UBA-CONICET). CABA, Argentina.
Fil: Ballivián Justiniano, Carlos. CONICET, Instituto de Recursos Minerales, Universidad Nacional de La Plata, 1900, La Plata, Argentina.
Fil: Christiansen, Rodolfo. CONICET, Instituto Sismológico-Geofísico Volponi, Universidad Nacional de San Juan, 5407, San Juan, Argentina.
Fil: Yoya, Belén. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
Fil: Restelli, Florencia. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
Fil: Basei, Miguel Ángel Stipp. Centro de Pesquisas Geocronológicas, Instituto de Geociências, Universidade de São Paulo, Brazil.
Oriolo, S., González, P.D., Schulz, B., Giacosa, R., Renda, E., Marcos, P., Suárez, R., Ballivián Justiniano, C., Christiansen, R., Yoya, B., Restelli, F., Basei, M. 2021. The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths. Metamorphic Studies Group Research in Progress Meeting. The Mineralogical Society. Abstract Volume, p. 35. Virtual meeting 29-31 March 2021.
The Gondwanide Orogeny represents a major late Palaeozoic tectonometamorphic event along southern Gondwana, roughly coeval with the Variscan collision recorded along the northern Gondwana margin. In South America it is nearly ubiquitous along the proto-Pacific margin, being intimately associated with protracted subduction. Most relics of the Gondwanide Orogen were upper crustal rocks, but lower to middle crustal remnants are well-exposed in Patagonia (Argentina & Chile). Since robust P-T-D-t constraints are still scarce for the region, the aim of this contribution is to present a regional evaluation of integrated structural, petrological and petrochronological data, in order to evaluate the spatial and temporal evolution at the orogeny scale. The orogen core comprises medium- to high-grade metamorphic complexes exposed between the North Patagonian Andes and the western North Patagonian Massif, recording dominantly high-T/high- to medium-P metamorphic conditions between the middle Carboniferous and the early Permian [1, 2, 3]. They are spatially associated with coeval calc-alkaline granitoids with continental arc affinity [4, 5, 6]. Further northeast, regional medium- to highgrade metamorphism is documented by the middle to late Permian in the eastern North Patagonian Massif, yielding comparable high-T/high- to medium-P metamorphic conditions. In a similar way, these metamorphic rocks are intruded by middle to late Permian granitoids [e.g., 4]. Finally, Permian low- and very low-grade metamorphism is documented in the Ventania System to the northeast of the North Patagonian Massif as part of the Gondwanide foreland. Permian felsic magmatic rocks are also present, but mainly restricted to tuffs within the sedimentary sequence and a small syenitic-granitic intrusion. In all these areas the Gondwanide Orogen is dominated by WNWESE-to NNW-SSE-striking fabrics, mainly associated with a regional metamorphic foliation and, locally, late shear zones. Deformation fabrics and kinematic data suggest a dextral-transpressive regional deformation regime. The marked contrast between metamorphic conditions in northern Patagonia and the Ventania System seems to result from different crustal-scale geodynamic controls. In Patagonia the pre-Gondwanide evolution was related to protracted Palaeozoic subduction and basin evolution along an accretionary margin [7]. In contrast, in the Ventania System there was reactivation of a crustal discontinuity between its Neoproterozoic basement and the adjacent Río de la Plata Craton (RPC) [8]. In this context, widespread crustal thickening during the Gondwanide Orogeny in northern Patagonia might have favoured stabilization of the Palaeozoic accretionary margin [1]. In contrast, the RPC had already attained a high thermal stability during Late Paleoproterozoic cratonization, thus resulting in a thick lithospheric mantle that behaved as a relatively rigid keel. Consequently, the RPC only recorded limited far-field Gondwanide deformation and exhumation [9]. References: [1] Oriolo S et al. (2019) Tectonics 38:2378-2400; [2] Marcos P et al. (2020) Lithos 376:105801; [3] Renda E et al. (2020) J S Am Earth Sci 106:103045; [4] Pankhurst R et al. (2006) Earth-Sci Rev 76:235-257; [5] Varela R et al. (2015) Rev Asoc Geol Arg 72:419-432; [6] Renda E et al. (2019) Tectonophysics 772:228232; [7] Suárez R et al. (2019) J S Am Earth Sci 95:102256; [8] Christiansen R et al. Precambrian Res, under review; [9] Zalba PE et al. (2007) J Sediment Res 77:528-538.
Materia
Ciencias de la Tierra (General)
Gondwanide Orogen
South America
Patagonia
Metamorphic Trajectory
Permian
Ciencias de la Tierra (General)
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
RID-UNRN (UNRN)
Institución
Universidad Nacional de Río Negro
OAI Identificador
oai:rid.unrn.edu.ar:20.500.12049/8282

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spelling The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.Oriolo, SebastiánGonzález, Pablo DiegoSchulz, BernhardGiacosa, Raúl EduardoRenda, Emiliano ManuelMarcos, PauloSuárez, Rodrigo JavierBallivián Justiniano, CarlosChristiansen, RodolfoYoya, BelénRestelli, FlorenciaBasei, Miguel Ángel StippCiencias de la Tierra (General)Gondwanide OrogenSouth AmericaPatagoniaMetamorphic TrajectoryPermianCiencias de la Tierra (General)Fil: Oriolo, Sebastián. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.Fil: González, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Servicio Geológico Minero Argentino, Centro General Roca, Río Negro, SEGEMAR Regional Sur, Independencia 1495, Parque Industrial 1, Gral. Roca, (Río Negro), C. P. 8332, Casilla, Correo, Argentina.Fil: Schulz, Bernhard. TU Bergakademie Freiberg, Institute of Mineralogy, Saxony, Alemania.Fil: Giacosa, Raúl Eduardo. Servicio Geológico Minero Argentino, Centro General Roca, Río Negro, SEGEMAR Regional Sur, Independencia 1495, Parque Industrial 1, Gral. Roca, (Río Negro), C. P. 8332, Casilla, Correo, Argentina.Fil: Renda, Emiliano Manuel. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.Fil: Marcos, Paulo. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina. IIPG, UNRN, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Roca 1242, (R8332EXZ), General Roca, Río Negro, Argentina.Fil: Suárez, Rodrigo Javier. IDEAN (UBA-CONICET). CABA, Argentina.Fil: Ballivián Justiniano, Carlos. CONICET, Instituto de Recursos Minerales, Universidad Nacional de La Plata, 1900, La Plata, Argentina.Fil: Christiansen, Rodolfo. CONICET, Instituto Sismológico-Geofísico Volponi, Universidad Nacional de San Juan, 5407, San Juan, Argentina.Fil: Yoya, Belén. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.Fil: Restelli, Florencia. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.Fil: Basei, Miguel Ángel Stipp. Centro de Pesquisas Geocronológicas, Instituto de Geociências, Universidade de São Paulo, Brazil.Oriolo, S., González, P.D., Schulz, B., Giacosa, R., Renda, E., Marcos, P., Suárez, R., Ballivián Justiniano, C., Christiansen, R., Yoya, B., Restelli, F., Basei, M. 2021. The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths. Metamorphic Studies Group Research in Progress Meeting. The Mineralogical Society. Abstract Volume, p. 35. Virtual meeting 29-31 March 2021.The Gondwanide Orogeny represents a major late Palaeozoic tectonometamorphic event along southern Gondwana, roughly coeval with the Variscan collision recorded along the northern Gondwana margin. In South America it is nearly ubiquitous along the proto-Pacific margin, being intimately associated with protracted subduction. Most relics of the Gondwanide Orogen were upper crustal rocks, but lower to middle crustal remnants are well-exposed in Patagonia (Argentina & Chile). Since robust P-T-D-t constraints are still scarce for the region, the aim of this contribution is to present a regional evaluation of integrated structural, petrological and petrochronological data, in order to evaluate the spatial and temporal evolution at the orogeny scale. The orogen core comprises medium- to high-grade metamorphic complexes exposed between the North Patagonian Andes and the western North Patagonian Massif, recording dominantly high-T/high- to medium-P metamorphic conditions between the middle Carboniferous and the early Permian [1, 2, 3]. They are spatially associated with coeval calc-alkaline granitoids with continental arc affinity [4, 5, 6]. Further northeast, regional medium- to highgrade metamorphism is documented by the middle to late Permian in the eastern North Patagonian Massif, yielding comparable high-T/high- to medium-P metamorphic conditions. In a similar way, these metamorphic rocks are intruded by middle to late Permian granitoids [e.g., 4]. Finally, Permian low- and very low-grade metamorphism is documented in the Ventania System to the northeast of the North Patagonian Massif as part of the Gondwanide foreland. Permian felsic magmatic rocks are also present, but mainly restricted to tuffs within the sedimentary sequence and a small syenitic-granitic intrusion. In all these areas the Gondwanide Orogen is dominated by WNWESE-to NNW-SSE-striking fabrics, mainly associated with a regional metamorphic foliation and, locally, late shear zones. Deformation fabrics and kinematic data suggest a dextral-transpressive regional deformation regime. The marked contrast between metamorphic conditions in northern Patagonia and the Ventania System seems to result from different crustal-scale geodynamic controls. In Patagonia the pre-Gondwanide evolution was related to protracted Palaeozoic subduction and basin evolution along an accretionary margin [7]. In contrast, in the Ventania System there was reactivation of a crustal discontinuity between its Neoproterozoic basement and the adjacent Río de la Plata Craton (RPC) [8]. In this context, widespread crustal thickening during the Gondwanide Orogeny in northern Patagonia might have favoured stabilization of the Palaeozoic accretionary margin [1]. In contrast, the RPC had already attained a high thermal stability during Late Paleoproterozoic cratonization, thus resulting in a thick lithospheric mantle that behaved as a relatively rigid keel. Consequently, the RPC only recorded limited far-field Gondwanide deformation and exhumation [9]. References: [1] Oriolo S et al. (2019) Tectonics 38:2378-2400; [2] Marcos P et al. (2020) Lithos 376:105801; [3] Renda E et al. (2020) J S Am Earth Sci 106:103045; [4] Pankhurst R et al. (2006) Earth-Sci Rev 76:235-257; [5] Varela R et al. (2015) Rev Asoc Geol Arg 72:419-432; [6] Renda E et al. (2019) Tectonophysics 772:228232; [7] Suárez R et al. (2019) J S Am Earth Sci 95:102256; [8] Christiansen R et al. Precambrian Res, under review; [9] Zalba PE et al. 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dc.title.none.fl_str_mv The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
title The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
spellingShingle The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
Oriolo, Sebastián
Ciencias de la Tierra (General)
Gondwanide Orogen
South America
Patagonia
Metamorphic Trajectory
Permian
Ciencias de la Tierra (General)
title_short The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
title_full The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
title_fullStr The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
title_full_unstemmed The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
title_sort The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths.
dc.creator.none.fl_str_mv Oriolo, Sebastián
González, Pablo Diego
Schulz, Bernhard
Giacosa, Raúl Eduardo
Renda, Emiliano Manuel
Marcos, Paulo
Suárez, Rodrigo Javier
Ballivián Justiniano, Carlos
Christiansen, Rodolfo
Yoya, Belén
Restelli, Florencia
Basei, Miguel Ángel Stipp
author Oriolo, Sebastián
author_facet Oriolo, Sebastián
González, Pablo Diego
Schulz, Bernhard
Giacosa, Raúl Eduardo
Renda, Emiliano Manuel
Marcos, Paulo
Suárez, Rodrigo Javier
Ballivián Justiniano, Carlos
Christiansen, Rodolfo
Yoya, Belén
Restelli, Florencia
Basei, Miguel Ángel Stipp
author_role author
author2 González, Pablo Diego
Schulz, Bernhard
Giacosa, Raúl Eduardo
Renda, Emiliano Manuel
Marcos, Paulo
Suárez, Rodrigo Javier
Ballivián Justiniano, Carlos
Christiansen, Rodolfo
Yoya, Belén
Restelli, Florencia
Basei, Miguel Ángel Stipp
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias de la Tierra (General)
Gondwanide Orogen
South America
Patagonia
Metamorphic Trajectory
Permian
Ciencias de la Tierra (General)
topic Ciencias de la Tierra (General)
Gondwanide Orogen
South America
Patagonia
Metamorphic Trajectory
Permian
Ciencias de la Tierra (General)
dc.description.none.fl_txt_mv Fil: Oriolo, Sebastián. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
Fil: González, Pablo Diego. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina. Servicio Geológico Minero Argentino, Centro General Roca, Río Negro, SEGEMAR Regional Sur, Independencia 1495, Parque Industrial 1, Gral. Roca, (Río Negro), C. P. 8332, Casilla, Correo, Argentina.
Fil: Schulz, Bernhard. TU Bergakademie Freiberg, Institute of Mineralogy, Saxony, Alemania.
Fil: Giacosa, Raúl Eduardo. Servicio Geológico Minero Argentino, Centro General Roca, Río Negro, SEGEMAR Regional Sur, Independencia 1495, Parque Industrial 1, Gral. Roca, (Río Negro), C. P. 8332, Casilla, Correo, Argentina.
Fil: Renda, Emiliano Manuel. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina.
Fil: Marcos, Paulo. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina. IIPG, UNRN, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Roca 1242, (R8332EXZ), General Roca, Río Negro, Argentina.
Fil: Suárez, Rodrigo Javier. IDEAN (UBA-CONICET). CABA, Argentina.
Fil: Ballivián Justiniano, Carlos. CONICET, Instituto de Recursos Minerales, Universidad Nacional de La Plata, 1900, La Plata, Argentina.
Fil: Christiansen, Rodolfo. CONICET, Instituto Sismológico-Geofísico Volponi, Universidad Nacional de San Juan, 5407, San Juan, Argentina.
Fil: Yoya, Belén. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
Fil: Restelli, Florencia. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
Fil: Basei, Miguel Ángel Stipp. Centro de Pesquisas Geocronológicas, Instituto de Geociências, Universidade de São Paulo, Brazil.
Oriolo, S., González, P.D., Schulz, B., Giacosa, R., Renda, E., Marcos, P., Suárez, R., Ballivián Justiniano, C., Christiansen, R., Yoya, B., Restelli, F., Basei, M. 2021. The metamorphic architecture of the transpressional Gondwanide Orogen in southern South America: Insights from P-T-D-t paths. Metamorphic Studies Group Research in Progress Meeting. The Mineralogical Society. Abstract Volume, p. 35. Virtual meeting 29-31 March 2021.
The Gondwanide Orogeny represents a major late Palaeozoic tectonometamorphic event along southern Gondwana, roughly coeval with the Variscan collision recorded along the northern Gondwana margin. In South America it is nearly ubiquitous along the proto-Pacific margin, being intimately associated with protracted subduction. Most relics of the Gondwanide Orogen were upper crustal rocks, but lower to middle crustal remnants are well-exposed in Patagonia (Argentina & Chile). Since robust P-T-D-t constraints are still scarce for the region, the aim of this contribution is to present a regional evaluation of integrated structural, petrological and petrochronological data, in order to evaluate the spatial and temporal evolution at the orogeny scale. The orogen core comprises medium- to high-grade metamorphic complexes exposed between the North Patagonian Andes and the western North Patagonian Massif, recording dominantly high-T/high- to medium-P metamorphic conditions between the middle Carboniferous and the early Permian [1, 2, 3]. They are spatially associated with coeval calc-alkaline granitoids with continental arc affinity [4, 5, 6]. Further northeast, regional medium- to highgrade metamorphism is documented by the middle to late Permian in the eastern North Patagonian Massif, yielding comparable high-T/high- to medium-P metamorphic conditions. In a similar way, these metamorphic rocks are intruded by middle to late Permian granitoids [e.g., 4]. Finally, Permian low- and very low-grade metamorphism is documented in the Ventania System to the northeast of the North Patagonian Massif as part of the Gondwanide foreland. Permian felsic magmatic rocks are also present, but mainly restricted to tuffs within the sedimentary sequence and a small syenitic-granitic intrusion. In all these areas the Gondwanide Orogen is dominated by WNWESE-to NNW-SSE-striking fabrics, mainly associated with a regional metamorphic foliation and, locally, late shear zones. Deformation fabrics and kinematic data suggest a dextral-transpressive regional deformation regime. The marked contrast between metamorphic conditions in northern Patagonia and the Ventania System seems to result from different crustal-scale geodynamic controls. In Patagonia the pre-Gondwanide evolution was related to protracted Palaeozoic subduction and basin evolution along an accretionary margin [7]. In contrast, in the Ventania System there was reactivation of a crustal discontinuity between its Neoproterozoic basement and the adjacent Río de la Plata Craton (RPC) [8]. In this context, widespread crustal thickening during the Gondwanide Orogeny in northern Patagonia might have favoured stabilization of the Palaeozoic accretionary margin [1]. In contrast, the RPC had already attained a high thermal stability during Late Paleoproterozoic cratonization, thus resulting in a thick lithospheric mantle that behaved as a relatively rigid keel. Consequently, the RPC only recorded limited far-field Gondwanide deformation and exhumation [9]. References: [1] Oriolo S et al. (2019) Tectonics 38:2378-2400; [2] Marcos P et al. (2020) Lithos 376:105801; [3] Renda E et al. (2020) J S Am Earth Sci 106:103045; [4] Pankhurst R et al. (2006) Earth-Sci Rev 76:235-257; [5] Varela R et al. (2015) Rev Asoc Geol Arg 72:419-432; [6] Renda E et al. (2019) Tectonophysics 772:228232; [7] Suárez R et al. (2019) J S Am Earth Sci 95:102256; [8] Christiansen R et al. Precambrian Res, under review; [9] Zalba PE et al. (2007) J Sediment Res 77:528-538.
description Fil: Oriolo, Sebastián. IGEBA (CONICET-Universidad de Buenos Aires). CABA, Argentina.
publishDate 2021
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