TY - JOUR AU - Giambiagi, Laura AU - Alvarez, Pamela P. AU - Bechis, Florencia AU - Tunik, Maisa PY - 2005/12/30 Y2 - 2024/03/29 TI - Influence of the Triassic-Jurassic rift structures on the deformation style of the Aconcagua and Malargüe fold and thrust belts, Mendoza JF - Revista de la Asociación Geológica Argentina JA - RAGA VL - 60 IS - 4 SE - DO - UR - https://revista.geologica.org.ar/raga/article/view/1196 SP - 662-671 AB - <p>The Aconcagua and Malargüe fold and thrust belts developed in the Cordillera Principal, which between 32º- 34º and 34º-36º S latitude respectively, show a complex interaction between the sedimentary cover and the basement as a result of the existence of Triassic-Jurassic rift-related normal faults of the northern part of the Neuquén basin. Structural studies, together with chronological analysis of the deformation in the thin-skinned and thick-skinned zones, indicate that the evolution of both belts was controlled by the presence of NNW-trending border faults of the Atuel, Nieves Negras - Alvarado and Yeguas Muertas depocentres of the Neuquén basin. In this study we analyze three possible mechanisms of interaction between the thin-skinned and thick-skinned deformation. For the Aconcagua FTB, we propose that the pre-existing normal faults controlled the location of ramps within the basement. For the southernmost part of the Aconcagua FTB and the northern part of the Malargüe FTB we propose a mechanism of tectonic inversion of rift-related faults, together with short-cut faults, which propagated into the sedimentary cover generation the thin-skinned deformational area.</p> ER -