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Single subduction zone for the generation of Devonian ophiolites and high‐P metamorphic belts of the Variscan Orogen (NW Iberia)

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Díez Fernández, Rubén and Arenas Martín, Ricardo and Sánchez Martínez, Sonia and Novo Fernández, Irene and Albert Roper, Richard (2021) Single subduction zone for the generation of Devonian ophiolites and high‐P metamorphic belts of the Variscan Orogen (NW Iberia). Terra Nova . ISSN 0954-4879, ESSN: 1365-3121

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Official URL: https://onlinelibrary.wiley.com/doi/full/10.1111/ter.12455



Abstract

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.


Item Type:Article
Uncontrolled Keywords:high-P rocks, ophiolite, subduction, suture zone, Variscan Orogen
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Petrology
ID Code:60329
Deposited On:04 May 2020 12:19
Last Modified:12 May 2020 08:03

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