40Ar/39Ar thermochronology of Paleoproterozoic granitoids of northeast Burkina Faso, West African Craton: Implications for regional tectonics

Considering closure temperatures of the isotopic systems, the U-Pb ages and the present 40Ar/39Ar dating results suggest that after emplacement, the granitoids cooled to 315 ̊C at ca. 2020 Ma with a mean cooling rate of 6.5 ̊C/Ma; corresponding to a mean uplift rate of 0.65 km/Ma. The additional K-feldspar 40Ar/39Ar data indicate a later slow cooling stage with a rate of 0.54 ̊C/Ma, corresponding to a mean uplift rate of 0.054 km/Ma, subsequent to the end of the major crustal growth in the WAC at ∼2000 Ma