Géochronologie 207Pb/ 206Pb et 40Ar/ 39Ar des granites paléoprotérozoïques de la ceinture de roches vertes du Rio Itapicuru (Bahia, Brésil)

207 Pb/ 206 Pb and 40 Ar/ 39 Ar geochronology can accurately determine the crystallization age of the granites of the Palaeoproterozoic Rio ltapicuru Greenstone Belt, and allow discussion of a cooling model in which slow rates of ca. 3.4 °C/Ma were involved.