Abstract:
The study area is inserted in the northeastern portion of the São Francisco Craton, in the Gavião Block. The geological mapping carried out in the Abaíra-Jussiape region allowed us identify two magmatic suites named Caraguataí and Jussiape. Both suites are crosscut by reverse to reversedextral shear zones, which resulted in the formation of mylonitic rocks. The older Caraguataí Suite includes alkali-feldspar granites, syenites and quartz-syenites, whose mesomylonitic component was dated by U-Pb method (LA-ICPMS) at 2711 ± 13 Ma. The Jussiape Suite, intrusive in the former, consists of monzogranites to syenogranites, which were dated at 2076 ± 51 Ma. These ages suggest the existence of Neoarchean and Paleoproterozoic magmatism in this sector of the Gavião Block.
Keywords:
Shear zones; anticline; Paramirim Corridor; Gavião Block