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3D crustal-scale structure of the West Iberia margin: a novel approach to integrated structural characterization of passive margins

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Abstract

Hyperextended margins are very heterogeneous along the entire length of the margin, so the definition of tectonic domains made exclusively from 2D seismic sections presents serious limitations. In this work we present an approach of the 3D crustal-scale structure of the West Iberia margin (WIM) by modelling eight lithospheric sections, using seismic, wells and gravity data. The continuous nature of gravity data allowed us to propose a new map of tectonic domains within the WIM. Maps of total horizontal (THD) and vertical gradients (dZ) of Bouguer anomaly have been calculated and compared with other criteria such as the crustal structure and thinning factor. This comparative analysis has been carried out on a section proposed as a model for the Western Iberian Margin (Tugend et al. in Tectonics, 2014; Cadenas et al. in Tectonics 37:758–785, 2018), and on four 2 + 1/2D gravimetric models transversal to the margin. The results point out a significant variation in the absolute values of Bouguer anomaly, thinning factor and crustal structure along the margin and, therefore, of the position of the different domain boundaries. Clear patterns that correlating the Bouguer anomaly signal and its derivatives to the tectonic domain are evidenced. Most significantly, the necking-zone and its transition to the hyperextended domain are characterized by high values of the THD of the Bouguer anomaly. The observed patterns in Bouguer anomaly and its derivatives provide a solid constraint for mapping the boundaries between different tectonic domains along the margin, even in those areas where limited deep seismic information could lead to uncertain interpretations. The results of this work can also inform on the general kinematics of the WIM.

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modified from Péron-Pinvidic et al. 2013 and Cadenas et al. 2018)

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Acknowledgments

First author was supported by a Ph. D grant from Repsol Exploración (Madrid) and partially financially funded by the I+D CARESOIL-CM (S2018/EMT-4317) and MARIBNO projects (PGC2018-095999-B-I00). The authors wish to thank anonymous reviewers for their thoughtful reviews that have greatly helped us to improve the quality of the paper. Geosoft Oasis Montaj and GM-SYS has been used for potential field interpretation and gravity 2-D modelling respectively. Maps and figures have been performed using GMT software (Wessel and Luis, 2017).

Funding

First author was supported by a Ph. D grant from Repsol Exploración (Madrid) and partially financially funded by the I + D CARESOIL-CM (S2018/EMT-4317) and MARIBNO projects (PGC2018-095999-B-I00).

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Authors and Affiliations

  1. Tectonophysics Group, Earth Sciences Faculty, Complutense University, Madrid, Spain

    Cristina Granado, Alfonso Muñoz-Martín & María Druet

  2. Instituto de Geociencias (CSIC, UCM), Madrid, Spain

    Alfonso Muñoz-Martín

  3. Repsol E&P, Madrid, Spain

    Antonio J. Olaiz

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

    Oscar Fernández

  5. Instituto Geológico y Minero de España, Madrid, Spain

    María Druet

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  1. Cristina Granado
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  2. Alfonso Muñoz-Martín
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  3. Antonio J. Olaiz
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  4. Oscar Fernández
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  5. María Druet
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Contributions

CG: Conceptualization, Writing—Original Draft, Writing—Review & Editing, Methodology, Formal analysis, Investigation, Visualization. AM-M: Conceptualization, Writing—Original Draft, Writing—Review & Editing, Methodology, Formal analysis, Investigation, Visualization, Supervision. AJO: Conceptualization, Writing—Review & Editing, Formal analysis, Supervision. OF: Conceptualization, Writing—Review & Editing, Formal analysis, Supervision. MD: Formal analysis, Visualization, Review.

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Correspondence to Cristina Granado.

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Granado, C., Muñoz-Martín, A., Olaiz, A.J. et al. 3D crustal-scale structure of the West Iberia margin: a novel approach to integrated structural characterization of passive margins. Mar Geophys Res 42, 10 (2021). https://doi.org/10.1007/s11001-021-09432-2

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