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The structure of the South-Central-Pyrenean fold and thrust belt as constrained by subsurface dat
Muñoz, Josep Antón (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Mencos, Joana (Universitat de Girona. Departament de Ciències Ambientals)
Roca i Abella, Eduard (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Gratacós Torrà, Òscar (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Ferrer García, José Oriol (Universitat de Barcelona. Departament de Dinàmica de la Terra i de l'Oceà)
Fernández, O.

Date: 2018
Abstract: The interpretation of the available seismic lines of the South-Central-Pyrenean fold and thrust belt, conveniently tied with the exploration wells, define the main structural features of this realm of the Pyrenees. In particular, they define the geometry and areal extension of the autochthonous foreland underneath the sole thrust. The mapping ofseveral selected structural lines brings constraints for the structural interpretation of the South-Central Pyrenees, including the cut-off lines between selected stratigraphic horizons of the autochthonous foreland and the branch line between basement-involved thrust sheets and the sole thrust. The thrust salient which characterizes at surface the geometry of the South-Pyrenean fold and thrust belt contrasts with the linear trend of these structural lines at subsurface. This salient has been the result of a secondary progressive curvature developed since Middle Eocene times by thrust displacement gradients during verthrusting of the South-Pyrenean thrust sheets above a Paleogene autochthonous sequence. Displacement gradients resulted from the uneven distribution of weak salt layers, mostly the Triassic and the Upper Eocene ones. The minimum amount of South-directed displacement from early MiddleEocene times to Late Oligocene is 52km, which would be significantly higher if internal shortening by folding and cleavage/fracture development as well as hanging-wall erosion is added.
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original. Creative Commons
Language: Anglès.
Document: article ; recerca ; publishedVersion
Subject: Pyrenees ; Seismic data ; Cut-off and branch line
Published in: Geologica acta, Vol. 16 Núm. 4 (December 2018) , p. 439-460 (Articles) , ISSN 1696-5728

Adreça alternativa: https://www.raco.cat/index.php/GeologicaActa/article/view/347817
DOI: 10.1344/GeologicaActa2018.16.4.7

22 p, 8.7 MB

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Articles > Published articles > Geologica acta
Articles > Research articles

 Record created 2019-01-22, last modified 2019-10-16

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