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EGU2020-12777 LIL 04 F ii 5 cm Intensity 500 450 400 350 300 250 200 150 100 50- iii Methods Ides characterization and (U-Th)/He dating CC ④ BY UIR 04 B iii 5 cm L4Eiii1b сминим Before dating the samples the mineralogy has been characterized on every visible generation first at macro scale (apparent density, colour and morphology) and micro scale (SEM and XRD). Here, the samples present various petrologies mainly pisolithic (LIL) and iron massive banded iron types (UIR). The XRD analysis revealed that the LIL sample are hematite and UIR sample are mainly goethite. The (U-Th)/He dating method is based on the accumulation of 4He, in the mineral struct to radioactive decay from mainly U and Th elements. For this purpose we measure the daughter and the father element concentration to obtain the age. We replicate several aliquots on the same generation. 0 eerium 1750 buil 0 5 10 15 20 25 30 35 40 45 Angle 20 Characterization SEM + XRD He Extraction LASER-QUAD-MS + U-Th Measurements ICP-MS

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