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dc.contributor.author
Navarrete Granzotto, César Rodrigo
dc.contributor.author
Gianni, Guido Martin
dc.contributor.author
Encinas, A.
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Marquez, Marcelo Jose
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Kamerbeek, Constanza Belén
dc.contributor.author
Valle, Mauro Nicolás
dc.contributor.author
Folguera, A.
dc.date.available
2020-11-26T13:55:31Z
dc.date.issued
2019-07
dc.identifier.citation
Navarrete Granzotto, César Rodrigo; Gianni, Guido Martin; Encinas, A.; Marquez, Marcelo Jose; Kamerbeek, Constanza Belén; et al.; Triassic to Middle Jurassic geodynamic evolution of southwestern Gondwana: From a large flat-slab to mantle plume suction in a rollback subduction setting; Elsevier Science; Earth-science Reviews; 194; 7-2019; 125-159
dc.identifier.issn
0012-8252
dc.identifier.uri
http://hdl.handle.net/11336/119062
dc.description.abstract
A novel geodynamic evolution model of the southwestern region of Gondwana from the late Triassic to the middle Jurassic period is proposed in this contribution, based on new data collected in the Patagonian region and an exhaustive bibliographic review. New geochemical data of La Leona Fm. (Deseado Massif) and a new zircon U/Pb age (207.6 + 4.1/−2.3 Ma), added to a compilation of previous geochronological and geochemical data, allow confirming the existence of an Upper Triassic magmatic arc in central Patagonia, with typical adakitic features. This volcanic arc developed about ~1000?1100 km away from the hypothetical paleo-trench (at its most distal portion) in and intraplate position. New geological mapping carried out in the surrounding areas of these arc-related products allowed recognizing an important and previously underestimated late Triassic contractional episode that affected the south-central Patagonian region, which can be correlated with multiple events of deformation in southwestern Gondwana as far as in the Cape and Sierra de la Ventana fold belts. After this contractional episode, the Jurassic Chon Aike Silicic Large Igneous Province (SLIP - Deseado Massif and North Patagonian Massif) outbursts from a crustal source linked to a mantle thermal anomaly, as new geochemical data and previous data indicate. New and previous structural, geochemical, and geochronological data allow us to propose the existence of a late Triassic-earliest early Jurassic flat-slab episode (~227?190? Ma), here referred to as the South Gondwanian flat-slab, comparable in size with the largest present and previously documented flat-slab configurations on Earth. This event would have been responsible for the inland arc migration, from a western position on the Antarctic Peninsula to central Patagonia (Central Patagonian Batholith), as well as the widespread contractional pulse registered in southwestern Gondwana. The existence of this late Triassic shallow subduction episode is reinforced by a combination of P-wave seismic tomographic data and a recent plate kinematic reconstruction that reveal an anomalous inland location for the subducted slab, presently at the base of the lower mantle. In Lower Jurassic times, a slab-detachment episode developed simultaneously with the impingement and southwestward displacement of the Karoo mantle plume, would have favored the destabilization of the flat-subduction configuration. A re-establishment of the subduction in southwestern Gondwana, associated with the Lower Jurassic magmatic arc retraction (Subcordilleran Patagonian Batholith), occurred under extensional conditions most likely associated with slab rollback and a southwestward asthenospheric return flow. This upper mantle flow may have exerted a suction effect on the Karoo mantle plume towards Patagonia, expanding its lifespan with a continuous southwestward rejuvenation of the synextensional SLIP Chon Aike´s magmatism.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
FLAT-SLAB SUBDUCTION
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MANTLE PLUME SUCTION
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PATAGONIA
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ROLLBACK
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SOUTHWESTERN GONDWANA
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TRIASSIC-JURASSIC MAGMATISM
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UPPER TRIASSIC
dc.subject.classification
Geología
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Triassic to Middle Jurassic geodynamic evolution of southwestern Gondwana: From a large flat-slab to mantle plume suction in a rollback subduction setting
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-18T17:28:04Z
dc.journal.volume
194
dc.journal.pagination
125-159
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Navarrete Granzotto, César Rodrigo. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Gianni, Guido Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.description.fil
Fil: Encinas, A.. Universidad de Concepción; Chile
dc.description.fil
Fil: Marquez, Marcelo Jose. Secretaría de Industria y Minería. Servicio Geológico Minero Argentino; Argentina. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina
dc.description.fil
Fil: Kamerbeek, Constanza Belén. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Valle, Mauro Nicolás. Universidad Nacional de la Patagonia "San Juan Bosco"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Folguera, A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.journal.title
Earth-science Reviews
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0012825219301655
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.earscirev.2019.05.002
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