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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259.4/2562

    Título
    Gravity and magnetic anomalies in the allochthonous Órdenes Complex (Variscan belt, northwest Spain): Assessing its internal structure and thickness
    Autor
    Martínez Catalán, José R. .
    Álvarez Lobato, Fernando .
    Pinto, Victor .
    Gómez Barreiro, Juan .
    Ayarza, Puy .
    Villalaín Santamaria, Juan JoséUBU authority
    Casas, Albert
    Publicado en
    Tectonics, 2012, v. 31, n. 5, TC5007
    Editorial
    Wiley
    Fecha de publicación
    2012-10
    ISSN
    0278-7407
    DOI
    10.1029/2011TC003093
    Abstract
    The Órdenes Complex is the largest Variscan allochthonous structure of NW Iberia, and preserves the suture of a long-standing Paleozoic ocean, probably the Rheic. Gravity and magnetic data, the latter specifically acquired on land for this study, show that the complex occupies the core of an open synform with a maximum depth of 9–10 km, which contrasts with the flat geometry of the lower crust and Moho discontinuity beneath. The maximum depth reached by the ophiolitic rocks marking the suture is around 7 km. The allochthonous units formed by basic and ultrabasic rocks are lens-shaped in section, and occur not only at the periphery of the complex, but form wide ribbons trending NE-SW to N-S. The Bouguer anomaly related with the longest of them, the Fornás Unit, previously used to support an autochthonous interpretation of the complexes, is modeled as a rootless, massive amphibolite body with a maximum thickness of 6 km located at the downthrown block of a large normal fault cutting across previous thrust faults and extensional detachments. The main magnetic anomalies are associated with ultrabasic rocks cropping out in the NW and SE, but a weak, wide anomaly in the central part of the complex is related with one or more thin layers of amphibolite partly mineralized with massive sulphides. The weakly arcuate geometry of this anomaly and of the Bouguer anomaly caused by the Fornás Unit may reflect the NE flank of the Central Iberian arc, an orocline whose core is occupied by the allochthonous complexes.
    Palabras clave
    Órdenes Complex
    NW Iberia
    Variscan Belt
    geophysical modeling
    Materia
    Paleontología
    Paleontology
    Magnetismo
    Magnetism
    URI
    http://hdl.handle.net/10259.4/2562
    Versión del editor
    http://onlinelibrary.wiley.com/doi/10.1029/2011TC003093/abstract
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    • Artículos PALEOMAG-UBU
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