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Abstract

This profile (Figures 2a, 2b) shows three halokinetic (Triassic salt) structures in different stages of theirs evolution:

  1. 1.

    To the north a structure which grew during the Cretaceous as indicated by the thinning of the corresponding beds. Erosion at the base of the Tertiary suggests later reactivation of the salt structure.

  2. 2.

    To the south a pre-Oligocene piercement structure.

  3. 3.

    in the center of the section an exaggerated piercement which almost reaches the present sea floor.

  4. 4.

    Sedimentation during the Albo-Aptian involves thickening of the beds in synclines between salt swells.

This profile (Figures 3a, 3b) shows the following features:

  1. 1.

    Outflow of salt during the Eocene.

  2. 2.

    The "roots" of the structure are related to a deep structural feature causing doming during the Albe-Aptian extensional phase.

  3. 3.

    The Pyreneen compressional phase was very active during the Eocene and leads to the outflow of the salt.

  4. 4.

    The roof of the salt dome carries a Senonian fragment that was encountered by Well B but not penetrated in Well A.

  5. 5.

    The doming of the salt seemingly affects the northern flank of the section with thickening of the beds during the Eocene. Synclinal compensatory filling during the Eocene is also associated with the southern flank.

  6. 6.

    Halokinetic processes ceased during the Miocene and Pliocene. This period corresponds to the east to west progradation of the continental shelf as indicated by a number of channels displayed on the section.

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