Influence of de acute accent collement-cover thickness variations in fold-and-thrust belts: Insights from centrifuge analog modeling

Centrifuge analog modeling incorporating thickness variations of de ' collement and overlying sedimentary cover is used to study thrust-wedge evolution on salt-detached contractional systems involving tapered sedimentary cover. From simpler, layer-cake to 3D tapered de ' collement-cover sequences, our models constrain wedge evolution: a more advanced front, where the cover is thicker, promotes differential frontal translation and triggers vertical axis rotation of several hinterland anticlines which appear towards the thinner cover area. In all cases, the de ' collement level is strongly sheared and tends to migrate laterally toward the thinner cover areas. Models are compared with previous analog models under normal gravity and the natural example of the South Pyrenean Central salient. All in all, we conclude that a 3D tapered de ' collement-cover basin architecture, as a sole factor, can determine the formation of a thrust salient formed by increasing structural curvature (progressive arc).

Automated summary

The study investigates the thrust-wedge evolution on salt-detached contractional systems involving tapered sedimentary cover. The results show that a thicker cover promotes differential frontal translation and triggers rotation of hinterland anticlines towards the thinner cover area. The decollement level tends to migrate laterally towards the thinner cover areas. This study provides important insights into the evolution of thrust-wedge systems.