Extensional salt tectonics in the partially inverted Cotiella post-rift basin (south-central Pyrenees): structure and evolution

Lopez-Mir, Berta and Muñoz, Josep Anton and García Senz, Jesus (2015) Extensional salt tectonics in the partially inverted Cotiella post-rift basin (south-central Pyrenees): structure and evolution. International Journal of Earth Sciences, 104 (2). pp. 419-434. ISSN 1437-3254 (Print) 1437-3262 (Online) DOI https://doi.org/10.1007/s00531-014-1091-9

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The Cotiella Massif in the south-central Pyrenees hosts upper Cretaceous gravity-driven extensional faults which were developed in the Bay of Biscay–Pyrenean paleorift margin of the Atlantic Ocean. They accommodate up to 6 km of post-rift carbonates above relict upper Triassic salt. Subsequent Pyrenean contractional deformation preserved the main extensional features, but most of the upper Triassic salt was expulsed and then dissolved, leaving little indications of the original salt volume. Nonetheless, several distinctive salt-related features are still recognizable both at outcrop and at basin scale, providing an exposed analogue for salt-floored extensional basins developed on passive margins. Based on field research, we re-interpret the tectonic evolution of the area and suggest that passive diapirs were coeval with gravity-driven extension during the development of the Cotiella basin. The given interpretations are supported with detailed geological maps, original structural data, cross sections and outcrop photographs. The discovery of previously unknown post-rift salt structures in the Cotiella Massif is an extra element to consider in the paleogeographic reconstructions of the upper Cretaceous passive margin of the Bay of Biscay–Pyrenean realm and consequently helps in our understanding of the evolution of current Atlantic-type margins.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68, CASP;
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: International Journal of Earth Sciences
Volume: 104
Page Range: pp. 419-434
Identification Number: https://doi.org/10.1007/s00531-014-1091-9
Depositing User: Sarah Humbert
Date Deposited: 23 Feb 2015 16:27
Last Modified: 27 Feb 2015 16:20
URI: http://eprints.esc.cam.ac.uk/id/eprint/3246

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