Origin of a restraining bend in an evolving strike-slip system : The Cenozoic As Pontes basin (NW Spain)
Santanach i Prat, Pere F. (Universitat de Barcelona. Departament de Geodinàmica i Geofísica)
Ferrús, B. (Universitat de Barcelona. Departament de Geodinàmica i Geofísica)
Cabrera, L. (Universitat de Barcelona. Departament d’Estratigrafia, Paleontología i Geociències marines)
Sáez, A. (Universitat de Barcelona. Departament d’Estratigrafia, Paleontología i Geociències marines)

Data: 2005
Resum: The As Pontes basin (12 km2), NW Iberian Peninsula, is bounded by a double restraining bend of a dextral strike-slip fault, which is related to the western onshore end of the Pyrenean belt. Surface and subsurface data obtained from intensive coal exploration and mining in the basin since the 1960s together with additional structural and stratigraphic sequence analysis allowed us to determine the geometric relationships between tectonic structures and stratigraphic markers. The small size of the basin and the large amount of quality data make the As Pontes basin a unique natural laboratory for improving our understanding of the origin and evolution of restraining bends. The double restraining bend is the end stage of the structural evolution of a compressive underlapping stepover, where the basin was formed. During the first stage (stepover stage), which began ca. 30 Ma ago (latest Rupelian) and lasted 3. 4 My, two small isolated basins bounded by thrusts and normal faults were formed. For 1. 3 My, the strike-slip faults, which defined the stepover, grew towards each other until joining and forming the double restraining bend, which bounds one large As Pontes basin (transition stage). The history of the basin was controlled by the activity of the double restraining bend for a further 3. 4 My (restraining bend stage) and ended in mid-Aquitanian times (ca. 22 Ma).
Drets: 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
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Matèria: Strike-slip basement fault ; Restraining bend basin models ; Oligocene-Miocene ; Iberian Peninsula
Publicat a: Geologica acta, Vol. 3, Núm. 3 (2005) , p. 225-239, ISSN 1696-5728

Adreça alternativa: http://www.raco.cat/index.php/GeologicaActa/article/view/82305
DOI: 10.1344/105.000001393

15 p, 985.8 KB

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