Magnetic characterization of the zigzag shaped J‐anomaly: Implications for kinematics and breakup processes at the Iberia–Newfoundland margins

• Published in: Terra Nova
• Main Authors: Szameitat, Luizemara S. A., Manatschal, Gianreto, Nirrengarten, Michael, Ferreira, Francisco J. F., Heilbron, Monica
• Other Authors: Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Universidade Federal do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Científico e Tecnológico
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2020
• Subjects: Newfoundland
• Online Access: http://dx.doi.org/10.1111/ter.12466; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fter.12466; https://onlinelibrary.wiley.com/doi/pdf/10.1111/ter.12466; https://onlinelibrary.wiley.com/doi/full-xml/10.1111/ter.12466

Abstract Lithospheric breakup is generally defined as the process that results in a new plate boundary and oceanic crust. However, how this process occurs in magma‐poor systems remains debated. As recently suggested, the J‐magnetic anomaly at the Iberia–Newfoundland margins has polygenic sources and therefore cannot be interpreted as an isochron. However, the presence of the J‐anomaly on both margins suggests a common origin. By using analytic signal map of magnetic data, we highlight landward zigzagged limits for the J‐anomalies at the Iberian–Newfoundland margins. The zigzag segments neither match the axis nor the transform systems of previously proposed plate reconstructions, but are aligned with NE‐SW Palaeozoic trends. However, they can be fitted using recently published plate restorations, as expected if they have a single origin. Therefore, a link between the location of syn‐ to post‐breakup magmatic additions along the J‐anomaly and an inherited lithospheric trend is proposed.