From back-arc to rifted margin: Geochemical and Nd isotopic records in Neoproterozoic?-Cambrian metabasites of the Bystrzyckie and Orlickie Mountains (Sudetes, SW Poland)

► Neoproterozoic?-Cambrian metabasites from W part of the Orlica-Śnieżnik Dome, SW Poland. ► Contrasting back-arc basin and within-plate affinities of the rocks reveal changes in tectonic setting. ► Vestiges of Cadomian? supra-subduction and Early Palaeozoic incipient rift setting along Gondwana margin.