Artículo

Gianni, G.M.; Echaurren, A.; Folguera, A.; Likerman, J.; Encinas, A.; García, H.P.A.; Dal Molin, C.; Valencia, V.A. "Cenozoic intraplate tectonics in Central Patagonia: Record of main Andean phases in a weak upper plate" (2017) Tectonophysics. 721:151-166
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Abstract:

Contraction in intraplate areas is still poorly understood relative to similar deformation at plate margins. In order to contribute to its comprehension, we study the Patagonian broken foreland (PBF) in South America whose evolution remains controversial. Time constraints of tectonic events and structural characterization of this belt are limited. Also, major causes of strain location in this orogen far from the plate margin are enigmatic. To unravel tectonic events, we studied the Cenozoic sedimentary record of the central sector of the Patagonian broken foreland (San Bernardo fold and thrust belt, 44°30′S-46°S) and the Andes (Meseta de Chalia, 46°S) following an approach involving growth-strata detection, U-Pb geochronology and structural modeling. Additionally, we elaborate a high resolution analysis of the effective elastic thickness (Te) to examine the relation between intraplate contraction location and variations in lithospheric strength. The occurrence of Eocene growth-strata (~ 44–40 Ma) suggests that contraction in the Andes and the Patagonian broken foreland was linked to the Incaic phase. Detection of synextensional deposits suggests that the broken foreland collapsed partially during Oligocene to early Miocene. During middle Miocene times, the Quechua contractional phase produced folding of Neogene volcanic rocks and olistostrome deposition at ~ 17 Ma. Finally, the presented Te map shows that intraplate contraction related to Andean phases localized preferentially along weak lithospheric zones (Te < 15 km). Hence, the observed strain distribution in the PBF appears to be controlled by lateral variations in the lithospheric strength. Variations in this parameter could be related to thermo-mechanical weakening produced by intraplate rifting in Paleozoic-Mesozoic times. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Cenozoic intraplate tectonics in Central Patagonia: Record of main Andean phases in a weak upper plate
Autor:Gianni, G.M.; Echaurren, A.; Folguera, A.; Likerman, J.; Encinas, A.; García, H.P.A.; Dal Molin, C.; Valencia, V.A.
Filiación:IGSV, Instituto Geofísico Sismológico Ing. F. Volponi, Universidad Nacional de San Juan, CONICET, Km 12, jardín de los Poetas, Rivadavia, San Juan 5400, Argentina
IDEAN, Instituto de Estudios Andinos Don Pablo Groeber, UBA – CONICET, Departamento de Ciencias Geológicas, FCEN, Universidad de Buenos Aires, Argentina
Departamento de Ciencias de la Tierra, Universidad de Concepción, Casilla 160-C, Concepción, Chile
SEGEMAR, Av. Julio Argentino Roca 651, Buenos Aires, C1067ABB, Argentina
School of the Environment, Washington State University, Pullman, WA 99164, United States
Palabras clave:Andean phases; Broken foreland; Elastic thickness; Growth-strata; Intraplate contraction; Binary alloys; Geochronology; Lead; Plates (structural components); Volcanic rocks; Andean phases; Broken foreland; Effective elastic thickness; Elastic thickness; Fold-and-thrust belts; Growth strata; High resolution analysis; Structural characterization; Tectonics; Cenozoic; deformation; elasticity; fold and thrust belt; foreland basin; geochronology; geological record; intraplate process; Miocene; Neogene; Oligocene; plate tectonics; rifting; uranium-lead dating; Andes; Patagonia
Año:2017
Volumen:721
Página de inicio:151
Página de fin:166
DOI: http://dx.doi.org/10.1016/j.tecto.2017.10.005
Título revista:Tectonophysics
Título revista abreviado:Tectonophysics
ISSN:00401951
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v721_n_p151_Gianni

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Citas:

---------- APA ----------
Gianni, G.M., Echaurren, A., Folguera, A., Likerman, J., Encinas, A., García, H.P.A., Dal Molin, C.,..., Valencia, V.A. (2017) . Cenozoic intraplate tectonics in Central Patagonia: Record of main Andean phases in a weak upper plate. Tectonophysics, 721, 151-166.
http://dx.doi.org/10.1016/j.tecto.2017.10.005
---------- CHICAGO ----------
Gianni, G.M., Echaurren, A., Folguera, A., Likerman, J., Encinas, A., García, H.P.A., et al. "Cenozoic intraplate tectonics in Central Patagonia: Record of main Andean phases in a weak upper plate" . Tectonophysics 721 (2017) : 151-166.
http://dx.doi.org/10.1016/j.tecto.2017.10.005
---------- MLA ----------
Gianni, G.M., Echaurren, A., Folguera, A., Likerman, J., Encinas, A., García, H.P.A., et al. "Cenozoic intraplate tectonics in Central Patagonia: Record of main Andean phases in a weak upper plate" . Tectonophysics, vol. 721, 2017, pp. 151-166.
http://dx.doi.org/10.1016/j.tecto.2017.10.005
---------- VANCOUVER ----------
Gianni, G.M., Echaurren, A., Folguera, A., Likerman, J., Encinas, A., García, H.P.A., et al. Cenozoic intraplate tectonics in Central Patagonia: Record of main Andean phases in a weak upper plate. Tectonophysics. 2017;721:151-166.
http://dx.doi.org/10.1016/j.tecto.2017.10.005