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Paleogeographic evolution of a segmented oblique passive margin: the case of the SW Iberian margin

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Abstract

The SW Iberian margin is an oblique passive margin developed during the Mesozoic, as part of the opening of the westernmost Ligurian Tethys. The Algarve Basin developed on the SW Iberian margin and its sedimentary record was strongly controlled by tectonics. The Algarve Basin was dominated during the Mesozoic by WSW–ENE trending extensional faults and their associated depocenters, segmented by oblique NW–SE transfer zones. Two major NW–SE trending transfer zones connected the Algarve Basin to the Gorringe Bank in the west and to the Betic Basin in the east. The SW Iberian margin was later inverted during Late Cretaceous to Cenozoic times, due to convergence between Africa and Iberia. Inversion of the Algarve Basin and the SW Iberian margin was controlled by both the WSW–ENE and NW–SE trending structures formed during the passive margin phase. The evolution of the Algarve Basin during the Mesozoic and up to the Paleogene is documented in this paper through paleogeographic reconstructions based on field geology and reinterpretation of offshore seismic and well data.

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Fig. 1
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Modified after Fernandez (2019)

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Modified after Ramos et al. (2017c)

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Modified from Ramos et al. (2017a)

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Modified after Ramos et al. (2017c). Data courtesy of TGS

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Modified after Ramos et al. (2017c). Data courtesy of TGS

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Modified from Ramos et al. (2017a)

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Acknowledgments

The authors would like to thank to Niko Froitzheim and two anonymous reviewers who provided helpful and constructive comments and suggestions that largely improved the manuscript. This study was funded by Repsol Exploración (Madrid) and partially financially supported by the SALTECRES project (CGL2014-54118-C2-1-R MINECO/FERDER, UE) and the Geodinàmica i Anàlisi de Conques research group (2014SGR467) from the Agència de Gestió d’Ajuts Universitaris i de Recerca and the Secretaria d’Universitats i Recerca del Departament d’Economia i Coneixement de la Generalitat de Catalunya. Adrià Ramos thanks Repsol Exploración for his Ph.D grant. The authors wish to thank Repsol Exploración and Partex-Oil&Gas for permission to present this work, and Portugal Exploration Team for his support and enthusiasm. We also want to thank Schlumberger and PETEX Ltd for Petrel and MOVE academic licenses respectively. This work was possible thanks to Repsol and Partex-Oil&Gas, providing us proprietary vintage 2D seismic data and a 3D seismic cube, allowing us to publish it. TGS provided us the seismic survey PDT00-PD00, also allowing to publish the results that emerge from its interpretation.

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Authors and Affiliations

  1. Departament de Dinàmica de la Terra i de l’Oceà, Institut de Recerca Geomodels, Universitat de Barcelona, Barcelona, Spain

    A. Ramos & J. A. Muñoz

  2. IGME – Instituto Geológico y Minero de España - Geological Survey of Spain (IGME), Madrid, Spain

    A. Ramos

  3. Repsol Exploración, Madrid, Spain

    O. Fernández & Á. Arnaiz

  4. Department of Geodynamics and Sedimentology, University of Vienna, Vienna, Austria

    O. Fernández

  5. Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera, Universidade de Lisboa, IDL, Lisbon, Portugal

    P. Terrinha

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Ramos, A., Fernández, O., Terrinha, P. et al. Paleogeographic evolution of a segmented oblique passive margin: the case of the SW Iberian margin. Int J Earth Sci (Geol Rundsch) 109, 1871–1895 (2020). https://doi.org/10.1007/s00531-020-01878-w

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