Influence of the cenozoic tectonics from the Peruvian Forearc on the Morro Solar deformation mechanism by means of structural analysis

Abstract

The outcrops from the Morro Solar locality gave birth in the Lower Cretaceous within a purely extensional tectonic regime which changed to a compressional regime linked to an oblique plate tectonic convergence as of the Upper Cretaceous and during Cenozoic era. In order to study the pos sedimentary cenozoic tectonics that superimposed to such outcrops, it has been necessary to collect an important quantity of structural data from surface represented by the geometric orientation of fault surfaces that shows a observable tectonic displacement as well microstructures such slickenlines and kinematic indicators from a fragile environment. Accordingly, it was possible to determine two structural systems that worked in different times. The younger structural system is composed by a set of ~NE-SW to ~W-E normal faults which by means of the proposed structural analysis in this study it concluded that they were yielded as the result of a “strain partitioning” that occurred during the Cenozoic times within the central Peruvian forearc.