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Geophysical fingerprints of hyper-extended, exhumed and embryonic oceanic domains: the example from the Iberia–Newfoundland rifted margins

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Abstract

This study investigates the magnetic and gravity signatures and associated seismic character of hyper-extended, exhumed and embryonic oceanic domains along the conjugate Iberia–Newfoundland rifted margins. As these margins have been drilled down to basement along their distal parts, it is possible to explore and test different geophysical techniques and interpretations. The aims of this work are twofold: (1) to investigate the location and nature of the two main marginal boundaries—the necking zone and the J Anomaly, which define the limits of major domains; and (2) to map the lateral variations of gravity and magnetic signatures and their detailed correlation with seismic data, from the proximal margin until the first unequivocal oceanic magnetic anomaly (e.g. C34 Anomaly). The results point out that the J Anomaly corresponds to a first-order tectono-magmatic boundary, with a basement formed by polyphase magmatism. It marks the boundary between the exhumed mantle domain, with little magmatic additions, from a domain oceanwards that reveals comparable trends, frequencies and a general magnetic pattern at both sides of the Atlantic, suggesting a coeval evolution. We propose that the domain between the J and the C34 Anomalies was formed by an embryonic spreading system, with intermittent budgets of magma, similar to those observed at very slow spreading systems. The J Anomaly may thus correspond to the location of lithospheric breakup though its origin and the nature of the domain oceanwards remains to be constrained.

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Acknowledgments

The authors wish to thank Petrobras S.A. for financing the Postdoc of Natasha Stanton and Emmanuel Masini for the fruitful discussions. We wish to thank L. Magnavita and an anonymous reviewer for the important constructive comments that helped to improve the manuscript.

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  1. Natasha Stanton

    Present address: Faculty of Oceanography-Rio de Janeiro State University, São Francisco Xavier Street, 524 - Maracanã, Rio de Janeiro, RJ, CEP 20550-013, Brazil

Authors and Affiliations

  1. IPGS-EOST, Université de Strasbourg, CNRS, 1 rue Blessig, 67084, Strasbourg Cedex, France

    Natasha Stanton, Gianreto Manatschal, Julia Autin & Daniel Sauter

  2. Université de Bretagne Occidentale-Laboratoire des Domaines Océaniques (UMR 6538), Plouzané, France

    Marcia Maia

  3. Petrobras, Petrobras Research Center, Rio de Janeiro, Brazil

    Adriano Viana

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Stanton, N., Manatschal, G., Autin, J. et al. Geophysical fingerprints of hyper-extended, exhumed and embryonic oceanic domains: the example from the Iberia–Newfoundland rifted margins. Mar Geophys Res 37, 185–205 (2016). https://doi.org/10.1007/s11001-016-9277-0

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