Journal
TECTONOPHYSICS
Volume 637, Issue -, Pages 30-44Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2014.09.008
Keywords
Salt tectonics; Salt wall; Gravity modelling; Sierras Marginales; Pyrenees; Oblique thrusting
Categories
Funding
- Geotransfer Research Group (Aragon Government)
- Spanish Ministry of Economy and Competitiveness [CGL2010-21968-C02-02]
- Pablo Santolaria, Training Programme for University Teaching Staff, Aragon Government [B057/11]
- Programa Europa XXI of the Obra Social CAI
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The southern Pyrenees provide several examples of diapiric structures linked to migration of Triassic evaporites associated with the movement of thrust sheets. Among them, the Naval diapir, the westernmost diapiric body in the Sierras Marginales unit, is key to understanding the mechanisms controlling salt tectonics in this sector of the Pyrenees. In this paper, we use geological mapping, field data, cross-sections, seismic reflection profiles and detailed gravity data to characterize the geometry of the Naval diapir, a body of Middle and Upper Triassic evaporites and shales, and its relationship with the sedimentary cover and compressional structures. The information obtained from these methods was used to construct 2.5D and 3D models. These models indicate the significant role of compressional oblique structures and crestal weakening in the origin of the N-S salt-wall geometry, during the translation-rotation of the western end of the Sierras Marginales thrust sheet in the Late Eocene-Oligocene times. The uplift of low-density materials outlived compressional activity in the area and continued during the Oligocene-Early Miocene. (C) 2014 Elsevier B.V. All rights reserved.
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