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dc.contributor.authorAyarza, Puy
dc.contributor.authorVillalaín Santamaria, Juan José 
dc.contributor.authorMartínez Catalán, José R.
dc.contributor.authorÁlvarez Lobato, Fernando
dc.contributor.authorDurán Oreja, Manuela
dc.contributor.authorCalvín Ballester, Pablo 
dc.contributor.authorRecio, Clemente
dc.contributor.authorSuárez Barrios, Mercedes
dc.contributor.authorGómez Martín, Elena
dc.date.accessioned2021-11-04T10:59:34Z
dc.date.available2021-11-04T10:59:34Z
dc.date.issued2021-03
dc.identifier.issn0278-7407
dc.identifier.urihttp://hdl.handle.net/10259/6095
dc.description.abstractThe 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.en
dc.description.sponsorshipProjects SA065P17 and BU235P18, funded by the Regional Castilla-León Government, (2) Salamanca University through different lines of funding related to its support to research groups program, (3) projects CGL2016-78560-P and CGL2016-77560 of the Spanish Ministry of Economy, Industry and Competitiveness, and (4) project PID2019-108753GB-C21/AECI/10.13039/501100011033 of the Agencia Estatal de Investigación.en
dc.format.mimetypeapplication/pdf
dc.language.isoengen
dc.publisherAmerican Geophysical Union (AGU)
dc.relation.ispartofTectonics. 2021, V. 40, n. 3, e2020TC006120en
dc.subjectaeromagnetic anomalyen
dc.subjectCentral Iberian Arcen
dc.subjectextensional tectonicsen
dc.subjectIberian Massifen
dc.subjectKiaman superchronen
dc.subjectmagnetic S-Type granitoidsen
dc.subject.otherGeologíaes
dc.subject.otherGeologyen
dc.subject.otherMagnetismoes
dc.subject.otherMagnetismen
dc.titleCharacterizing the Source of the Eastern Galicia Magnetic Anomaly (NW Spain): The Role of Extension in the Origin of Magnetization at the Central Iberian Arcen
dc.typeinfo:eu-repo/semantics/articlees
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.relation.publisherversionhttps://doi.org/10.1029/2020TC006120
dc.identifier.doi10.1029/2020TC006120
dc.type.hasVersioninfo:eu-repo/semantics/acceptedVersiones


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