"Estratigrafia" de rochas granitóides na região do Seridó (RN-PB) com base em critérios estruturais

The granitoid rocks of the Serido region, Northeast of Brazil, have been ascribed to a chronologie sequence based in their structural features and other field criteria.  The supracrustal sequence is intruded by three major granitoid generations (G 2 , G 3 , G 4 ), ranging from pre-to post-tectonic with respect to one of two main folding phases (F 2 , F 3 ). The older types (G 2 ) are extensively gneissified and were interpreted as basement in previous geological synthesis. The younger ones (G 3 , G 4 ) appear in large diapiric complexes or minor intrusions.  In basement nuclei it is possible to distinguish even older orthogneisses (G 1 ), sometimes comprising a large volume of the terrain, intruding amphibolites and other country rocks.  Aspects of the relationships between the granitoid events and the tectonic evolution of the region are further discussed.