Inversión tectónica de la Cuenca de Mazarrón en el Pleistoceno Medio (Cordilleras Béticas Orientales)

  1. Juan M. Insua Arévalo 1
  2. Julián García Mayordomo 2
  3. José Luis Sánchez Roldán 1
  4. Octavi Gómez Novell 3
  5. Stéphane Baize 4
  6. Hervé Jomard 4
  7. José Jesús Martínez Díaz 1
  8. Carolina Canora Catalán 5
  9. Paula Herrero Barbero 1
  10. Robert López Escudero 3
  11. Alicia Medialdea 6
  12. Eulàlia Masana Closa 3
  1. 1 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  2. 2 Instituto Geológico y Minero de España
    info

    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

  3. 3 RISKNAT, Institut Geomodels,Universitat de Barcelona
  4. 4 Institut de Radioprotection et de Sûreté Nucléaire
  5. 5 Universidad Autónoma de Madrid
    info

    Universidad Autónoma de Madrid

    Madrid, España

    ROR https://ror.org/01cby8j38

  6. 6 University of Cologne
    info

    University of Cologne

    Colonia, Alemania

    ROR https://ror.org/00rcxh774

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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2021

Issue: 18

Pages: 834

Type: Article

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Abstract

In the regional frame of convergence of the Eurasia and Nubia tectonic plates, the Eastern Betic Chain hosts the Mazarrón Basin, described as a tectonic graben filled up with Neogene marine sediments (Larouziere et al., 1987). This graben, with an north-south elongated shape, is bounded by two conjugate fault systems, NNE and NNW. In this work, we present results from morphotectonic, geophysical and paleoseismological investigation conducted at the northern part of the graben, related to Eastern Betic Shear Zone. We identified folding of variable amplitude interpreted to be related to deformation on high angle reverse faults with sinistral component in a transpressive tectonic regime. Those deformation features concern Middle to Late Pleistocene continental sediments and soils (calcretes). The identified faults correspond mainly to the ancient NNE normal faults that previously controlled the graben, reactivated as oblique reverse faults during the Middle Pleistocene (ca. 300 ka). This tectonic inversion now controls the evolution of the landscape (i.e., relief, drainage network, erosion and sedimentation zones), as well as the seismic potential of the fault of the area.

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