The Itaporanga granitic pluton intruded into the lithological contact separating Neoproterozoic pelitic metasediments from Meso- to Paleoproterozoic rocks that constitute the Cachoeirinha belt of northeastern Brazil. An aureole of pelitic gneisses containing sillimanite and andalusite indicates that emplacement occurred at 12–15 km depth. The objective of this work is a detailed study of its magmatic structures, mainly by means of anisotropy of magnetic susceptibility (AMS). Regularly spaced sampling (61 stations) yielded a magnetic fabric map, which shows two domains: (1) a western lobe, which has lineations close to vertical and E-trending foliations that merge southwestward as the transcurrent Igarassi shear zone is approached (ISZ), and (2) an eastern lobe, showing SE-trending lineations associated with inward-dipping magmatic foliation situated in the center of the lobe. The magnetic fabric is mostly paramagnetic in origin, i.e., related to crystallographic preferred orientation of biotite and hornblende. A low susceptibility magnitude (<0.4×10 −3 SI), typically of the ilmenite-series granites, is found in porphyritic granites, diorites or their hybrid products. Hysteresis data indicate that the ferrimagnetic contribution to the bulk susceptibility does not reach 30%. The magma was emplaced into a chamber developed by local WNW–ESE extension induced by an overall N–S shortening. Melt ascent may have been facilitated by the pre-existence of a steep fault zone bounding crustal discontinuities. The magma must have ponded along a mechanical barrier formed by the contact between phyllitic metapelites and its gneissic basement, which controlled the final emplacement structures of the pluton.