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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6095

    Título
    Characterizing the Source of the Eastern Galicia Magnetic Anomaly (NW Spain): The Role of Extension in the Origin of Magnetization at the Central Iberian Arc
    Autor
    Ayarza, Puy
    Villalaín Santamaria, Juan JoséUBU authority
    Martínez Catalán, José R.
    Álvarez Lobato, Fernando
    Durán Oreja, Manuela
    Calvín Ballester, PabloUBU authority Orcid
    Recio, Clemente
    Suárez Barrios, Mercedes
    Gómez Martín, Elena
    Publicado en
    Tectonics. 2021, V. 40, n. 3, e2020TC006120
    Editorial
    American Geophysical Union (AGU)
    Fecha de publicación
    2021-03
    ISSN
    0278-7407
    DOI
    10.1029/2020TC006120
    Abstract
    The Eastern Galicia Magnetic Anomaly is the best studied anomaly of the Central Iberian Arc. This is due to its location, on the Lugo-Sanabria gneiss dome, and to the fact that its source rocks crop out in the Xistral Tectonic Window. Multiple studies of this anomaly have been carried out, but still, new results keep on shedding light on its understanding. This paper presents the first results on rock magnetic analyses, natural remanent magnetization, anisotropy of the magnetic susceptibility, X-ray diffraction, and stable isotopes geochemistry carried out on the source rocks of this anomaly. Results suggest that magnetization responds to the increase in oxygen fugacity underwent by rocks affected by late Variscan (330-300 Ma) extensional tectonics. Extensional detachments were the pathways that allowed the entrance of fluids that led to syntectonic crystallization of magnetite and hematite in metasediments and inhomogeneous S-Type granitoids derived from their partial melting. Accordingly, magnetization is not linked to lithologies, but to extensional structures developed in the late Carboniferous/earliest Permian, during the Kiaman reverse superchron. Systematic reverse magnetic remanence exhibited by hematite-bearing samples confirms the age of the magnetization and adds complexity to the interpretation of the anomaly. Understanding the EGMA contributes to the interpretation of other anomalies existing in the CIA, also located on thermal domes. The observed extension-related magnetization probably affected most of the NW Iberian Massif, thus hindering the study of previous tectonics by paleomagnetic techniques. This work aims to provide new hints to interpret magnetic anomalies located in extensional tectonic contexts worldwide.
    Palabras clave
    aeromagnetic anomaly
    Central Iberian Arc
    extensional tectonics
    Iberian Massif
    Kiaman superchron
    magnetic S-Type granitoids
    Materia
    Geología
    Geology
    Magnetismo
    Magnetism
    URI
    http://hdl.handle.net/10259/6095
    Versión del editor
    https://doi.org/10.1029/2020TC006120
    Collections
    • Artículos PALEOMAG-UBU
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    Ayarza-tectonics_2021.pdf
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