RT Book, Section
T1 Cadomia origins: paired Ediacaran ophiolites from the Iberian Massif, the opening and closure record of peri-Gondwanan basins
A1 Arenas Martín, Ricardo
A1 Vérard, Christian
A1 Albert Roper, Richard
A1 Rojo Pérez, Esther
A1 Sánchez Martínez, Sonia
A1 Novo Fernández, Irene
A1 Moreno Martín, Diana
A1 Gerdes, Axel
A1 Garcia Casco, Antonio
A1 Díez Fernández, Rubén
AB The recent discovery of Ediacaran ophiolites in the SW Iberian Massif has made it possible to pinpoint the evolution of the Cadomian basement of Europe. The Calzadilla and Mérida ophiolites (gabbroic protoliths dated at c. 600 and 594 Ma, respectively) have geochemical characteristics typical of supra-subduction zone ophiolites. They are interpreted as originating during the initial opening of a forearc basin with boninitic magmatism (Calzadilla), followed by the formation of a back-arc basin with arc-tholeiites (Mérida). Widening of the back-arc led to the rifting and drifting of a section of the active continental margin (Cadomia). Closure of these oceanic domains initiated rapid contraction, culminating in the collision of Cadomia with Gondwana (c. 590–540 Ma). The application of a PANALESIS model to this palaeogeographic setting confirms the plausibility of Cadomian rifting and the likely opening of broad oceanic domains. It also confirms the final collision of Cadomia with Gondwana, although the synthetic and regional data disagree in the precise chronology of the convergence and collision of Cadomia with the West Africa Craton. This work shows that the evolution of the Cadomian basement is much more complex than traditionally considered.
PB The Geological Society
SN 0305-8719
YR 2024
FD 2024-04-23
LK https://hdl.handle.net/20.500.14352/105202
UL https://hdl.handle.net/20.500.14352/105202
LA eng
NO Arenas, Ricardo, et al. «Cadomia Origins: Paired Ediacaran Ophiolites from the Iberian Massif, the Opening and Closure Record of Peri-Gondwanan Basins». Geological Society, London, Special Publications, vol. 542, n.o 1, abril de 2024, pp. 507-26, https://doi.org/10.1144/SP542-2022-328
NO Ministerio de Ciencia e Innovación
NO Wilhelm and Else Heraeus Foundation
NO Deutsche Forschungsgemeinschaft
DS Docta Complutense
RD 25 feb 2026