The Arzacq-Western Pyrenees ECORS Deep Seismic Profile

  • M. Daignières
  • M. Séguret
  • M. Specht
  • ECORS Team
Part of the Special Publication of the European Association of Petroleum Geoscientists book series (3148, volume 4)

Abstract

In late 1989, a 100-km-long vertical seismic reflection profile was recorded in the western Pyrenees from the French-Spanish border, at the limit between the Axial Zone and the Mendibelza Paleozoic massif, to the deep Arzacq domain of the Aquitaine basin.

The data was acquired with an explosive source and 24 fold coverage. Target objectives of this profile were firstly to document variations in crustal thickness and nature, in relation to the different structural position of the basement and asociated sedimentary cover, and secondly, to investigate possible effects of tectonic inversion during Pyrenean convergence.

The Iberian and European Mohos are identified at 14–15 s TWT and 9.5–10.5 s TWT, respectively, giving an overall structure similar to that in the east, as shown by a previous ECORS profile. Northward-directed thrusts (St Palais and Ste Suzanne) in the north Pyrenean zone, and the thickness of the Mesozoic sedimentary fill (more than 10 km) of the Arzacq basin are detailed. Northward-dip ping reflectors (at 2–3.5 s) beneath the flysch basin of Mauléon are also detected but are still difficult to interpret (basement or Jurassic?).

Keywords

Cretaceous JurassIc Pyrene Refraction Eocene 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1994

Authors and Affiliations

  • M. Daignières
  • M. Séguret
  • M. Specht
  • ECORS Team

There are no affiliations available

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