Quaternary-active thrusts scarps tested as deformation markers by trishear models in the Southern Precordillera of Argentina

摘要

Scarps related to Quaternary-active thrust splays propagating in alluvial bajadas of the Southern Pre cordillera of Argentina (32 degrees 20') were studied through detailed topographic surveys, in order to understand the reliability of these landforms as deformation markers at an outcrop scale. Geometric parameters of causative structures were used to constrain balanced cross-sections through trishear modelling for shortening estimation and also with the aim of comparing the predicted geometry of these models with the scarp profile. Shortening estimation through retro-deformation of scarps contours was also conducted as an alternative approach for calculating deformation affecting these alluvial surfaces.