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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Europe
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Southern Europe
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Iberian Peninsula
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Central Iberian Zone (1)
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Iberian Massif (1)
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Portugal (2)
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Spain
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Galicia Spain
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Lugo Spain (1)
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Variscides (2)
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elements, isotopes
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metals
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rare earths (1)
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geochronology methods
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U/Pb (1)
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geologic age
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Paleozoic
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Carboniferous (2)
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igneous rocks
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igneous rocks
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plutonic rocks
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granites
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two-mica granite (1)
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metamorphic rocks
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metamorphic rocks
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migmatites
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anatexite (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (1)
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Primary terms
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absolute age (1)
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deformation (1)
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Europe
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Southern Europe
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Iberian Peninsula
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Central Iberian Zone (1)
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Iberian Massif (1)
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Portugal (2)
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Spain
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Galicia Spain
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Lugo Spain (1)
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Variscides (2)
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faults (1)
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folds (1)
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geochemistry (1)
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igneous rocks
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plutonic rocks
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granites
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two-mica granite (1)
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metals
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rare earths (1)
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metamorphic rocks
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migmatites
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anatexite (1)
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metamorphism (1)
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orogeny (1)
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paleogeography (1)
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Paleozoic
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Carboniferous (2)
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plate tectonics (1)
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tectonics (1)
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SHRIMP U-Pb ages and REE patterns for zircon from an anatectic Variscan two-mica granite from the Bemposta Migmatite Complex (Central Iberian Zone)
Space and time in the tectonic evolution of the northwestern Iberian Massif: Implications for the Variscan belt
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 high-pressure 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.