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Abstract:

The Malargüe fold and thrust belt, located in the Andean mountains between 34°S and 36°30′S, formed in response to contraction during Cenozoic times. Its structural style and geometry was controlled by the Mesozoic rift system that formed the Neuquén basin in west-central Argentina. The rift architecture in the southern sector of this belt was previously interpreted in terms of the present N-S compressive structural trends, assuming the inversion of pre-existing normal faults with the same orientation. Here, we propose that the NW-SE-trending El Manzano-Liu Cullín lineament, located in the northern termination of the Sierra Azul, reflects the presence of a half-graben master fault in the subsurface. This hypothesis is supported by subsurface data, a balanced cross section, and it is tested using a series of scaled sandbox analogue models. We suggest that the lineament responds to a reactivated NW-trending half-graben fault, hidden by the mainly N-S-trending Andean structures. The proposed orientation is in agreement with the NE-SW extension developed in the Neuquén basin during the Triassic-Early Jurassic. The modeling of the inverted oblique half-graben reveals that the strikes of the main structures of inversion-related belts may often be independent of the orientation of the previously developed extensional system, providing a new perspective for their interpretation. © 2008.

Registro:

Documento: Artículo
Título:Oblique half-graben inversion of the Mesozoic Neuquén Rift in the Malargüe Fold and Thrust Belt, Mendoza, Argentina: New insights from analogue models
Autor:Yagupsky, D.L.; Cristallini, E.O.; Fantín, J.; Valcarce, G.Z.; Bottesi, G.; Varadé, R.
Filiación:Laboratorio de Modelado Geológico (LaMoGe), Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA, Buenos Aires, Argentina
Repsol YPF S.A. Talero 360, 8300 Neuquén, Argentina
Repsol YPF, Esmeralda 255, Of. 10001E, Buenos Aires, Argentina
Palabras clave:Analogue modeling; Malargüe fold; Oblique inversion; Thrust belt; (1 1 1) orientation; Argentina; Cenozoic; cross sectioning; Early Jurassic; Fold-and-thrust belts; Half-graben; normal faults; Rift systems; Structural styles; Structural trends; Subsurface data; Triassic; Computer networks; Mathematical models; Neon; Tectonics; analog model; fold and thrust belt; graben; inversion tectonics; lineament; Mesozoic; normal fault; oblique fault; rift zone; rifting; Argentina; Malargue; Mendoza; Neuquen; South America; Capsicum pubescens
Año:2008
Volumen:30
Número:7
Página de inicio:839
Página de fin:853
DOI: http://dx.doi.org/10.1016/j.jsg.2008.03.007
Título revista:Journal of Structural Geology
Título revista abreviado:J. Struct. Geol.
ISSN:01918141
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01918141_v30_n7_p839_Yagupsky

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Citas:

---------- APA ----------
Yagupsky, D.L., Cristallini, E.O., Fantín, J., Valcarce, G.Z., Bottesi, G. & Varadé, R. (2008) . Oblique half-graben inversion of the Mesozoic Neuquén Rift in the Malargüe Fold and Thrust Belt, Mendoza, Argentina: New insights from analogue models. Journal of Structural Geology, 30(7), 839-853.
http://dx.doi.org/10.1016/j.jsg.2008.03.007
---------- CHICAGO ----------
Yagupsky, D.L., Cristallini, E.O., Fantín, J., Valcarce, G.Z., Bottesi, G., Varadé, R. "Oblique half-graben inversion of the Mesozoic Neuquén Rift in the Malargüe Fold and Thrust Belt, Mendoza, Argentina: New insights from analogue models" . Journal of Structural Geology 30, no. 7 (2008) : 839-853.
http://dx.doi.org/10.1016/j.jsg.2008.03.007
---------- MLA ----------
Yagupsky, D.L., Cristallini, E.O., Fantín, J., Valcarce, G.Z., Bottesi, G., Varadé, R. "Oblique half-graben inversion of the Mesozoic Neuquén Rift in the Malargüe Fold and Thrust Belt, Mendoza, Argentina: New insights from analogue models" . Journal of Structural Geology, vol. 30, no. 7, 2008, pp. 839-853.
http://dx.doi.org/10.1016/j.jsg.2008.03.007
---------- VANCOUVER ----------
Yagupsky, D.L., Cristallini, E.O., Fantín, J., Valcarce, G.Z., Bottesi, G., Varadé, R. Oblique half-graben inversion of the Mesozoic Neuquén Rift in the Malargüe Fold and Thrust Belt, Mendoza, Argentina: New insights from analogue models. J. Struct. Geol. 2008;30(7):839-853.
http://dx.doi.org/10.1016/j.jsg.2008.03.007