Abstract
Proterozoic granitoids as indicators of the tectonic evolution of northeastern Para, Bra- zil. Granitoids cropping out inside Phanerozoic sedimentary cover in northeast Para, Brazil (Gurupi region), records the geotectonic evolution of this region. 207 Pb/ 206 Pb single zircon evaporation ages were obtained for different granitoid bodies of the region, besides Sm-Nd isotopic studies. Almost all the plutons are genetically related with regional geological processes operative during this crustal segment formation, which includes the Sao Luis Craton. Such processes are associated with amalgamation of island arcs and Archean nuclei during the Pal- aeoproterozoic (2.15 to 2,07 Ga). The reworking of the southwestern margin of the Sao Luis Craton at the end of the Neoproterozoic formed the Gurupi Belt and is recorded by the occurrence of a granitic pluton of 549 ± 4 Ma.
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