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| Main Author: | |
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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universitat de Barcelona
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=50530302 |
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Table of Contents:
- Origin of a restraining bend in an evolving strike-slip system: The Cenozoic As Pontes basin (NW Spain) P. Santanach B. Ferrús L. Cabrera A. Sáez Ciencias de la Tierra Strike Miocene Oligocene Iberian Peninsula slip basement fault The As Pontes basin (12 km2), NW Iberian Peninsula, is bounded by a double restraining bend of a dextralstrike-slip fault, which is related to the western onshore end of the Pyrenean belt. Surface and subsurface dataobtained from intensive coal exploration and mining in the basin since the 1960s together with additional structuraland stratigraphic sequence analysis allowed us to determine the geometric relationships between tectonicstructures and stratigraphic markers. The small size of the basin and the large amount of quality data make theAs Pontes basin a unique natural laboratory for improving our understanding of the origin and evolution ofrestraining bends. The double restraining bend is the end stage of the structural evolution of a compressiveunderlapping stepover, where the basin was formed. During the first stage (stepover stage), which began ca. 30Ma ago (latest Rupelian) and lasted 3.4 My, two small isolated basins bounded by thrusts and normal faultswere formed. For 1.3 My, the strike-slip faults, which defined the stepover, grew towards each other untiljoining 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). 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530302 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.3