Intraplate Strike-Slip Corridor within South America (NE Border of the Paraná Basin) Unveiled by Structural Analysis of Faults and Fracture Swarms

We present the effect of neotectonics in intracratonic settings as revealed by surface, brittle deformation associated to a regionally-sized shear corridor, which affects Southeastern Brazil. The zone is characterized presence nearly orthogonal fracture sets, interpreted systematic and non-systematic joints often cutting Quaternary deposits. An original methodology fault joint inversion Monte Carlo converging approach used infer multiple paleostress fields. method provides best orientation principal paleo-stresses responsible for observed fracturing. At each step process, structures are uniquely stress tensor that lowest error. results showed poly-phased tectonic history corridor studied paleostresses compatible with regional strike-slip motion. Specifically, an E-W, left-lateral was followed right-lateral kinematics related post-Paleogene drifting South American Plate its clockwise rotation. latter event presently proposed may represent Cenozoic reactivation ancient weakness zone. speculate described intraplate belt represents continental prosecution Rio de Janeiro