40Ar/39Ar constraints on the age and thermal history of the Urucum Neoproterozoic banded iron-formation, Brazil

► 40Ar/39Ar geochronology on metamorphic minerals of the Urucum-BIF sequence. ► Ages impose a lower limit for the depositional age of the iron-formation. ► Ages correlate with the Brasiliano thermo-tectonic events. ► Ages reveal the effects of weathering after exhumation of the sequence.