Pliocene-Quaternary deformational structures in the eastern Algarve continental shelf, Gulf of Cadiz

  1. M. Luján 1
  2. F.J. Lobo 2
  3. T. Mestdagh 3
  4. J. Tomás Vázquez 4
  5. M. C. Fernández-Puga 1
  6. D. Van Rooij 3
  1. 1 Departamento de Ciencias de la Tierra, Universidad de Cádiz
  2. 2 Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada
  3. 3 Department of Geology, Ghent University,
  4. 4 Instituto Español de Oceanografía, Centro Oceanográfico de Málaga
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Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 2020

Issue: 67

Pages: 3-6

Type: Article

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Abstract

The eastern Algarve continental shelf in the northern margin of the Gulf of Cadiz has been investigated by analysing a set of high-re-solution seismic reflection profiles. We examine the major structural elements affecting the upper sedimentary units. A seismo-strati-graphic interpretation and regional correlation allowed the identi-fication of a major discontinuity that separates two main intervals, pre-Middle Pleistocene (MP) and post-MP. In addition, a number of deformation features such as ENE-WSW to NE-SW thrusts, kilome-tric-scale N-S to NW-SE folds and NNE-SSW to NNW-SSE sub-ver-tical normal faults were identified affecting the Pliocene-Quaternary sedimentary record, indicating neotectonic activity. The structures pre-dating MP are in agreement with a dominant transpressive re-gime along the continental shelf, under the Late Cenozoic NW-SE oblique convergence and related to the reactivation of Mesozoic dia-piric structures. The structures post-dating MP induce a lower defor-mation of the sedimentary cover but were still active during the last glacial maximum, in agreement with the low uplift recognized in the Portuguese mainland

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Funding information

The research was supported through projects CGL2011-30302 and CTM2017- 88237-P and Group RNM-373 of Junta de Andalucía. We are very grateful to Javier Hernández Molina for his critical reading of the manuscript. We thank Guillermo Booth and Ferrán Estrada for their detailed reviews and constructive comments of the original version of the manuscript.

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