Inherited controls in Andean structure in a sector of the Malargüe fold-and-thrust belt, Mendoza province, Argentina

Abstract

The thick-skinned Malargüe fold-and-thrust belt characterizes the Andes in southern Mendoza province, Argentina. This complex structure is the result of the combination of the Andean deformation and inherited fabrics of the substratum. A sector of this fold-and-thrust belt has been mapped in detail to evaluate the controls on the Andean deformation. These controls include the presence of basement pre-existing structures and the rheology of the deformed units, especially the occurence of a thick gypsum horizon that worked as a boundary layer where the cover is detached, and locally produced important diapirism.