An Integrated Structural and Magnetic Fabric Study to Constrain the Progressive Extensional Tectonics of the Rio do Peixe Basin, Brazil

We constrained the tectonic evolution of intracratonic Cretaceous Rio do Peixe Basin (RPB) in NE Brazil, combining structural and Anisotropy Magnetic Susceptibility (AMS) data. analyzed features four sites along two major faults bordering basin, NE-striking Portalegre Fault E-W-striking Malta Fault. AMS data from 42 syn-rift sandstone suggest stretching directions driving opening RPB. The early phase I resulted N-S to NNE-SSW direction with vertical σ1, producing normal fault displacement right-lateral transtension Fault, Sítio Saguí Lagoa Forno faults. II NW-SE causing on left-lateral Additionally, extension was responsible for forming extensional deformation bands sedimentary units. RPB developed due intraplate Borborema Province during stage Pangea Breakup recorded that gradually shifted as a consequence South America clockwise rotation. stress orthogonal main Precambrian shear zones facilitated