Person:
Gómez Barreiro, Juan

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First Name
Juan
Last Name
Gómez Barreiro
URI
https://hdl.handle.net/20.500.14352/86767
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Geológicas
Department
Mineralogía y Petrología
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Subject: 552.3(234.1) ×

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    Careón ophiolite, NW Spain: Suprasubduction zone setting for the youngest Rheic Ocean fl oor
    (Geology (Boulder Colo.), 2007) Sánchez Martínez, Sonia; Arenas Martín, Ricardo; Díaz García, Florentino; Martínez Catalán, José Ramón; Gómez Barreiro, Juan; Pearce, Julian A.
    The Careón ophiolite (Galicia, NW Iberian Massif) shows lithological and geochemical features suggestive of an origin in a suprasubduction zone setting. As with other Devonian ophiolites in the European Variscan belt, it was generated within a contracting Rheic Ocean. This setting and the general absence of large Silurian-Devonian volcanic arcs on both of the Rheic Ocean margins strongly suggest that this ocean was closed by intraoceanic subduction directed to the north. This subduction removed the older normal (N) mid-oceanic-ridge basalt (MORB) oceanic lithosphere and gave rise to a limited volume of new suprasubduction zone oceanic lithosphere. The Careón ophiolite is a key element in understanding the evolution of the Rheic Ocean, which was the main oceanic domain that closed during the Paleozoic convergence of Gondwana and Laurussia, preceding the assembly of Pangea
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    Space and time in the tectonic evolution of the northwestern Iberian Massif: Implications for the Variscan belt.
    (4-D Framework of Continental Crust, 2007) Martínez Catalán, José Ramón; Arenas Martín, Ricardo; Díaz García, Florentino; González Cuadra, Pablo; Gómez Barreiro, Juan; Abati Gómez, Jacobo; Castiñeiras García, Pedro; Fernández Suárez, Javier; Sánchez Martínez, Sonia; Andonaegui Moreno, María Del Pilar; González Clavijo, Emilio; Díez Montes, Alejandro; Rubio Pascual, Francisco J.; Valle Aguado, Beatriz; Hatcher, Robert D.; Carlson, Marvin P.; McBride, John H.; Martínez Catalán, José Ramón
    Recent advances in geochemical studies of igneous rocks, isotopic age data for magmatism and metamorphism, quantitative pressure-temperature (P-T) estimates of metamorphic evolution, and structural geology in the northwestern Iberian Massif are integrated into a synthesis of the tectonic evolution that places the autochthonous and allochthonous terranes in the framework of Paleozoic plate tectonics. Because northwestern Iberia is free from strike-slip faults of continental scale, it is retrodeformable and preserves valuable information about the orthogonal component of convergence of Gondwana with Laurentia and/or Baltica, and the opening and closure of the Rheic Ocean. The evolution deduced for northwest Iberia is extended to the rest of the Variscan belt in an attempt to develop a three-dimensional interpretation that assigns great importance to the transcurrent components of convergence. Dominant Carboniferous dextral transpression following large Devonian and Early Carboniferous thrusting and recumbent folding is invoked to explain the complexity of the belt without requiring a large number of peri-Gondwanan terranes, and its ophiolites and highpressure allochthonous units are related to a single oceanic closure. Palinspastic reconstruction of the Variscan massifs and zones cannot be achieved without restoration of terrane transport along the colliding plate margins. A schematic reconstruction is proposed that involves postcollisional strike-slip displacement of ~3000 km between Laurussia and Gondwana during the Carboniferous.