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Brecciated rocks identified along the northwestern border of the Guaratubinha Basin are strictly associated to rhyolites that compose the Escutador Member, within the Serra do Salto Formation. This unit was affected by three deformational events, and the first one (E1) is related to a phase of intense tectonism and hydrothermalism. The present paper aims to characterize fault-related, hydrothermalized rocks associated to rhyolitic floods that took place in the Guaratubinha Basin. The definition of deformation mechanisms was based on a microstructural description of oriented samples, which were collected in the cores and along the borders of the recognized fault-planes. The identified breccia-like bodies display thicknesses up to 1 m, and are characterized by comminution features, wear abrasion, and fluids-assisted brecciation by and wear abrasion. These characteristics indicate that hydrothermalism and deformation were concentrated along fault planes. Consequently, these planes acted as conduits for the percolation of late-stage fluids, which were essential components for the formation of the structural arrangement of the breccias.

BRECHAS POLIFÁSICAS DA BORDA NOROESTE DA BACIA DO GUARATUBINHA, SUDESTE DO PARANÁ