Artículo

Martínez Dopico, C.I.; López de Luchi, M.G.; Rapalini, A.E.; Wemmer, K.; Fanning, C.M.; Basei, M.A.S."Emplacement and temporal constraints of the Gondwanan intrusive complexes of northern Patagonia: La Esperanza plutono-volcanic case" (2017) Tectonophysics. 712-713:249-269
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Abstract:

Two main lines of evidence disagree whether or not the Patagonian blocks collided with Gondwana. All models invoke the voluminous magmatism of the La Esperanza Complex as evidence for active subduction magmatic arc or to a postcollisional setting. The evolution of this bimodal igneous suite is reassessed with field, geochronological (SHRIMP U-Pb zircon and K-Ar mica) and petrophysical data. Emplacement of high-K calk-alkaline granitic magmas occurred at shallow crustal levels (2–8 ± 2 km depth) related to the development and collapse of a caldera associated with a regional NW-SE structural trend. Magmatism involved intermediate hybrid pulses at 273 ± 2 Ma and 255 ± 2 Ma (Prieto Granodiorite) that shifted like a yo-yo to acidic magmas at 260 ± 2 Ma and 250 ± 2 Ma (Donosa and Calvo granites). Absence of solid-state deformation features and the low anisotropy degrees in the granites indicate that its fabric is magmatic in origin. Magnetic fabric in granodiorites displays a concentrical pattern with subhorizontal foliations and lineations. Parallel to the volcanic axis, magnetic foliations and moderately plunging lineations indicate a common feeder system for plutonics and volcanics. Donosa Granite shows a discordant pattern with WNW-ESE ENE-WSW trending low plunging lineations and foliations. The plutono-volcanic system construction (273–255 Ma) followed NW-SE and NE-SW diamond shape faults trends and supracrustal discontinuities. Magmatic Climax is bracketed at 260 Ma. The collapse of the edifice is evidenced by the intrusion of acid magma plugs and dike swarms between 250 and 246 Ma. A similar age range was identified in other areas of Patagonia related to syn and postcollisional tectonic events. No evidence of tectonic activity such as major uplift, metamorphism or thrusting was found excepting regional strike-slip faulting and extension. Therefore, La Esperanza Complex is a high crustal level episode, and as such may not have structurally recorded an active collision during its crystallization and cooling. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Emplacement and temporal constraints of the Gondwanan intrusive complexes of northern Patagonia: La Esperanza plutono-volcanic case
Autor:Martínez Dopico, C.I.; López de Luchi, M.G.; Rapalini, A.E.; Wemmer, K.; Fanning, C.M.; Basei, M.A.S.
Filiación:Instituto de Geocronología y Geología Isotópica (INGEIS), Pabellón INGEIS, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina
Instituto de Ciencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Department of Geological Sciences, FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
Geoscience Centre of the University of Göttingen (GZG), Göttingen, Germany
Research School of Earth Sciences, The Australian National University, Mills Road, Canberra, ACT 2600, Australia
Instituto de Geociências, Universidade de São Paulo (USP), Rua do Lago 562, São Paulo, CEP-05508-900, Brazil
Palabras clave:Anisotropy of magnetic susceptibility; Gondwana; Patagonia; Permian; SHRIMP U-Pb dating; Subvolcanic magmatic complexes; Geochronology; Granite; Hydraulic structures; Magnetic anisotropy; Magnetic susceptibility; Magnetism; Materials handling equipment; Mica; Shellfish; Silicate minerals; Strike-slip faults; Volcanoes; Zircon; Anisotropy of magnetic susceptibility; Gondwana; Magmatic complexes; Patagonia; Permian; Shrimp u-pb dating; Lanthanum compounds; emplacement; Gondwana; magmatism; magnetic anisotropy; magnetic fabric; magnetic susceptibility; Permian; SHRIMP dating; uranium-lead dating; Patagonia; Decapoda (Crustacea); Esperanza
Año:2017
Volumen:712-713
Página de inicio:249
Página de fin:269
DOI: http://dx.doi.org/10.1016/j.tecto.2017.05.015
Handle:http://hdl.handle.net/20.500.12110/paper_00401951_v712-713_n_p249_MartinezDopico
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v712-713_n_p249_MartinezDopico

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Citas:

---------- APA ----------
Martínez Dopico, C.I., López de Luchi, M.G., Rapalini, A.E., Wemmer, K., Fanning, C.M. & Basei, M.A.S. (2017) . Emplacement and temporal constraints of the Gondwanan intrusive complexes of northern Patagonia: La Esperanza plutono-volcanic case. Tectonophysics, 712-713, 249-269.
http://dx.doi.org/10.1016/j.tecto.2017.05.015
---------- CHICAGO ----------
Martínez Dopico, C.I., López de Luchi, M.G., Rapalini, A.E., Wemmer, K., Fanning, C.M., Basei, M.A.S. "Emplacement and temporal constraints of the Gondwanan intrusive complexes of northern Patagonia: La Esperanza plutono-volcanic case" . Tectonophysics 712-713 (2017) : 249-269.
http://dx.doi.org/10.1016/j.tecto.2017.05.015
---------- MLA ----------
Martínez Dopico, C.I., López de Luchi, M.G., Rapalini, A.E., Wemmer, K., Fanning, C.M., Basei, M.A.S. "Emplacement and temporal constraints of the Gondwanan intrusive complexes of northern Patagonia: La Esperanza plutono-volcanic case" . Tectonophysics, vol. 712-713, 2017, pp. 249-269.
http://dx.doi.org/10.1016/j.tecto.2017.05.015
---------- VANCOUVER ----------
Martínez Dopico, C.I., López de Luchi, M.G., Rapalini, A.E., Wemmer, K., Fanning, C.M., Basei, M.A.S. Emplacement and temporal constraints of the Gondwanan intrusive complexes of northern Patagonia: La Esperanza plutono-volcanic case. Tectonophysics. 2017;712-713:249-269.
http://dx.doi.org/10.1016/j.tecto.2017.05.015