A poliphasical structural and crystalline evolution is showed fot the region between São Paulo City and the edge of the Paraná Basin, in the São Roque and Paranapiacaba Assemblages of faulted Blocks at north of 24ºS parallel. The first event of crystallisation was the pre-tectonic magmatism I1, now represented by metabasites, contemporaneous to the geosynclinal stage. A deformation phase F1, that seems to have occurred during the geosynclinal inversion, is considered responsible for recumbent isoclinal or elosed folds, not yet very well charactezed. Contemporaneously, the regional metamorphism M1 develloped amphibolite facies assemblages. Migmatization m1 also occurred during this phase of deforrnation. The deformation phase F2 originated elosed folds (rarely isoclinal and open folds), with subvertical axial planes. F2 was the principal phase and affected all the regions. In the São Roque AssembIage it was the first event of of deforrnation; the regional metamorphism Ml occurred during this event at greenschist and amphibolite facies; the late-tectonic granítico magmatism also took pIace contemporaneously to F2 but after M1. This magmatism imposed local contact metamorphism M2. In the Paranapiacaba Assemblage, the F2 folding seems to be superimposed to F1 folding coaxially. The magmatism 12 in this Assemblage is syntectonic in relation to F2. The last folding was produced during F2 event, already in rigid conditions, and is represented by ondulations, crenulations and transpositions. Following, post-tectonic granitic instrusions 13 has been emplaced, imposing contact transformations M3. The retrograde metamorphism M1 seems to be related to the orogenie and the re-heating due to 13, and has elearly affected amphibolite facies lithologies. Finally, a F4 deformation phase originated the transcurrent faults responsible by the block faulted tectonic style of the region. The rocks in the fault zones was affected by intense cataclastic metamorphism M5. The poliphasic evolution is related to the Brazilian tecto-orogenic cycle (450-650 m.y.).
