Provenance of Ediacaran-Ordovician sediments of the Medio Armorican Domain, Brittany, West France: Constraints from U/Pb detrital zircon and Sm–Nd isotope data

The temporal evolution of the sedimentary source areas Armorican Massif, involving Ediacaran to Upper Ordovician strata, is investigated gain insight into palaeogeographic affinities and changes that occurred as a result Cadomian orogenesis. Until now, reconstructions based on geodynamic, stratigraphic paleontological data have shown geological continuity between Massif Iberian Bohemian massifs allowed researchers locate near West African Craton Trans-Saharan Belt. This study goes beyond interpretations lithostratigraphic correlation, which may be influenced by allocyclic factors (e.g., sea-level change) or fauna assemblages wide provincial distribution, provide correct assessment sediment flux. To determine location more accurately, provenance siliciclastic sediments was examined in this using U–Pb LA-MC-ICP–MS geochronology detrital zircons coupled with whole-rock Sm–Nd zircon Lu–Hf isotope analysis. work carried out succession Medio Domain. oldest studied rocks were belong Brioverian succession, contains mainly 519–781 Ma old zircons, likely derived from sources are still present basement. Successively, lower Paleozoic deposited rift stages Rheic Ocean, contributions new 827–1120 zircons. A comparison populations showed an increase negative εNd(t) εHf(t) values supply post-Cadomian samples. Moreover, it revealed North domains had different locations during Lower Ordovician, some Domain close Sahara Metacraton Arabian-Nubian Shield contiguous.