Isotopic results obtained with LA-ICP-MS on zircon grains. The dataset has been color coded following textural position. Uncertainties are given at 2σ. The whole dataset is slightly discordant. Concordant dates of 2758 ± 28 Ma and 2609 ± 51 Ma have been calculated with Isoplot software from analysis obtained in zircon grains hosted in garnet (green) and quartz (blue) respectively. Due to the large dispersion of the whole dataset, two discordia have been calculated (inferior and superior limits) to bring a time constrain of the dispersion.