“…The crustal breakup phase in the Newfoundland (SE Grand Banks)-west Iberia magma-poor rift system, which we use as a modern analogue for late Ediacaran to early Cambrian evolution of the Humber margin (fig. 8A), was characterized by hyperextension or extreme thinning of the crust to <10 km (e.g., thinning and exhumation phases of Peron- Pinvidic et al, 2013;Péron-Pinvidic & Manatschal, 2010) and bimodal magmatism along inherited, basement-involved faults in onshore (Peace et al, 2024) and offshore Newfoundland (Beranek et al, 2022;Hutter & Beranek, 2020;Johns-Buss et al, 2023) and onshore (Mata et al, 2015) and offshore Portugal (Pereira et al, 2017). Major faults at this stage of rift evolution were localized along the edges of Hblocks and penetrated the mantle lithosphere (e.g., decoupled deformation of Sutra et al, 2013), eventually resulting in the exhumation of lower crust and mantle rocks.…”