A zona de cisalhamento congo: um estudo baseado na análise deformacional e cinemática.

Abstract

The Congo Shear Zone (CSZ) is considered to be a structural boundary that separates the Alto Moxotó (AMT) and Rio Capibaribe (RCT) terrains, both belonging to the Central Domain of the Borborema Province. Due to its geodynamic importance for this segment of the province, a study involving a structural and kinematic analysis of this shear zone was carried out. It is shown that the CSZ experienced a transpressive sinistral deformation with pure shear-dominated. The three-dimensional strain analysis shows that the CSZ has undergone a strong flattening, which may have resulted in material extrusion along the maximum (X) and intermediate (Y) stretching axes of the strain ellipsoid. The pure sheardominated of the CSZ is mainly revealed from the quantification of the kinematic vorticity number (Wm). A simplified transpressive model involving material extrusion is discussed for the shear zone.