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Space and time in the tectonic evolution of the northwestern Iberian Massif: Implications for the Variscan belt.



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Martínez Catalán, José Ramón and Arenas Martín, Ricardo and Díaz García, Florentino and González Cuadra, Pablo and Gómez Barreiro, Juan and Abati Gómez, Jacobo and Castiñeiras García, Pedro and Fernández Suárez, Javier and Sánchez Martínez, Sonia and Andonaegui Moreno, Pilar and González Clavijo, Emilio and Díez Montes, Alejandro and Rubio Pascual, Francisco J. and Valle Aguado, Beatriz (2007) Space and time in the tectonic evolution of the northwestern Iberian Massif: Implications for the Variscan belt. In 4-D Framework of Continental Crust. Geological Society of America Memoir (200). The Geological Society of America, pp. 403-423. ISBN 9780813712000

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Official URL: https://pubs.geoscienceworld.org/gsa/books/book/443/4-D-Framework-of-Continental-Crust


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.

Item Type:Book Section
Uncontrolled Keywords:Variscan belt, Exotic terranes, Accretionary history, Strike-slip tectonics, Iberian Massif
Subjects:Sciences > Geology > Geodynamics
Sciences > Geology > Petrology
ID Code:69973
Deposited On:02 Feb 2022 09:45
Last Modified:02 Feb 2022 09:55

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