RT Journal Article
T1 Single subduction zone for the generation of Devonian ophiolites and high‐P metamorphic belts of the Variscan Orogen (NW Iberia)
A1 Díez Fernández, Rubén
A1 Arenas Martín, Ricardo
A1 Sánchez Martínez, Sonia
A1 Novo Fernández, Irene
A1 Albert Roper, Richard
AB Within the Variscan Orogen, Early Devonian and Late Devonian high‐P belts separated by mid‐Devonian ophiolites can be interpreted as having formed in a single subduction zone. Early Devonian convergence nucleated a Laurussia‐dipping subduction zone from an inherited lithospheric neck (peri‐Gondwanan Cambrian back‐arc). Slab‐retreat induced upper plate extension, mantle incursion and lower plate thermal softening, favouring slab‐detachment within the lower plate and diapiric exhumation of deep‐seated rocks through the overlying mantle up to relaminate the upper plate. Upper plate extension produced mid‐Devonian suprasubduction ocean floor spreading (Devonian ophiolites), while further convergence resulted in plate coupling and intraoceanic ophiolite imbrication. Accretion of the remaining Cambrian ocean heralded Late Devonian subduction of inner sections of Gondwana across the same subduction zone and the underthrusting of mainland Gondwana (culmination of NW Iberian allochthonous pile). Oblique convergence favoured lateral plate sliding, and explained the different lateral positions along Gondwana of terranes separated by Palaeozoic ophiolites.
PB Wiley
SN 0954-4879, ESSN: 1365-3121
YR 2021
FD 2021
LK https://hdl.handle.net/20.500.14352/6210
UL https://hdl.handle.net/20.500.14352/6210
LA eng
NO Ministerio de Economía y Competitividad (MINECO)
DS Docta Complutense
RD 23 jul 2024