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Artículo

Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina

Arzadún, GuadalupeIcon ; Tomezzoli, Renata NelaIcon ; Ferreira Da Trindade, Ricardo Ivan; Gallo, Leandro CésarIcon ; Cesaretti, Nora Noemi; Calvagno, Juan MartínIcon
Fecha de publicación: 08/2018
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

Pyroclastic levels are descripted in Sierras Australes outcrops and Claromeco Basin sub-surface records, interbedded with mudrocks and coal beds in the base of the Tunas Formation sequence that correspond to the Permian South West margin of Gondwana. The pyroclastic levels classify as fine tuff. SHRIMP zircon ages obtained are 291.7 ± 2.9 Ma in the outcrop and 295.5 ± 8.0 Ma in the subsurface. These ages are consistent with other zircon SHRIMP ages of other outcrops tuff of the Tunas Formation, with Permian flora, and with tuff ages of correlated Gondwana areas, in the Paraná, Karoo and Paganzo basins. These data, in addition with other geological evidences, support a tectonically active and changing environment during the Permian of Gondwana. The ages allowed calculating a northward latitudinal speed of 2.7 cm/year for Gondwana during the Permian. This latitudinal movement is explained as the consequence of the final coupling of several continental microplates, gradually amalgamated from the southern margins of Gondwana and from the northern of Laurentia to configure the final Pangea during the Triassic. Since the main accretions in the southwestern margin of Gondwana could have started during the Devonian - Carboniferous, this Permian orogeny (San Rafael Orogenic Phase in Argentina) would be representing the post - collisional deformation, with a peak of compression in the Early Permian that was attenuating towards the foreland during the Late Permian - Early Triassic. With these results, it is also possible to constraint the age of the upper Paleozoic glaciation up to 295, previous to the deposition of the Tunas Formation in the Sauce Grande Formation.
Palabras clave: SHRIMP , Tunas Formation , Gondwana , Permian
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/89046
URL: https://www.sciencedirect.com/science/article/pii/S0895981117304492
DOI: https://doi.org/10.1016/j.jsames.2018.05.001
Colecciones
Articulos(IGEBA)
Articulos de INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BS. AS
Citación
Arzadún, Guadalupe; Tomezzoli, Renata Nela; Ferreira Da Trindade, Ricardo Ivan; Gallo, Leandro César; Cesaretti, Nora Noemi; et al.; Shrimp zircon geochronology constrains on Permian pyroclastic levels, Claromecó Basin, South West margin of Gondwana, Argentina; Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 85; 8-2018; 191-208
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