Crustal structure under the central and eastern part of the Betic Cordillera
E. Banda,Jörg Ansorge +1 more
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In this paper, a network of seismic refraction profiles across the Betic Cordillera was established with shotpoints at sea off the Spanish coast, and the longest profile with a length of 440 km runs parallel to the general strike through the centre of the Biclòs.Abstract:
Summary. In 1974 and 1975 a network of crustal seismic refraction profiles across the Betic Cordillera was established with shotpoints at sea off the Spanish coast. The longest profile with a length of 440 km runs parallel to the general strike through the centre of the Betic Cordillera. Two other profiles lie south of the main profile closer to the coast and perpendicular to the east-west strike, respectively. The interpretation of P waves indicates pronounced lateral variations of the structure and thckness of the crust and upper mantle. Two different crustal blocks seem to exist on either side of the north-east trending Palomares and Alhama de Murcia fault system in the eastern Betic Cordillera. East of this fault system the crust is only 23 km thick with a shallow high velocity layer of 6.9 km s-'. West of this line in the central and southern part of the Betic Cordillera the crust-mantle boundary lies at depths of 39 km and 24 km, respectively. In this area a velocity of 6 km s-l is reached at about 3 km depth. A layer of reduced P-wave velocity follows between 7 and 12 km depth with a velocity of 5.4 km s-'. At its lower boundary the velocity increases to 6.2 km s-l and reaches values between 6.6 and 6.7 km s-l at a depth of 18 km under the south coast and 24 km under the centre of the Betic Coddlera east of Granada. A thin lid of about 6 km thickness and a P, velocity of 8.1 km s-' lies on top of a rather thick layer with the reduced velocity of 7.8 km s-'. At a depth of 63 km the velocity increases again to 8.3 km s-'. Deep-reaching structural differences mark the east-west trending boundary between the internal and external zones of the central Betic Cordillera.read more
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Origin of the Betic-Rif mountain belt
Lidia Lonergan,Nicky White +1 more
TL;DR: In this paper, a model for the Miocene evolution of the Betic-Rif mountain belts is proposed, which is compatible with the evolution of rest of the western Mediterranean.
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Evidence for active subduction beneath Gibraltar
Marc-André Gutscher,J. Malod,Jean-Pierre Réhault,Isabelle Contrucci,Frauke Klingelhoefer,L. Mendes-Victor,Wim Spakman +6 more
TL;DR: In this paper, a marine seismic survey that images an active accretionary wedge west of Gibraltar is reported, indicating ongoing westward-vergent tectonic shortening, and provides compelling evidence for an active east-dipping subduction zone.
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Geologic evolution of the Betic Cordilleras in the Western Mediterranean, Miocene to the present
TL;DR: The Betic Cordilleras are characterized as having been deformed by regional horizontal shortening (compression) oriented WNW-ESE or NW-SE, which gradually rotated to the NNW-SSE in the Late Miocene, when its most important intramontane Neogene basins were formed.
44. the origin and tectonic history of the alboran basin: insights from leg 161 results 1
TL;DR: In this paper, the authors investigated the origin and structural evolution of the Alboran Basin and showed that the basin is floored with metamorphic rocks of continental origin (high-grade schist, migmatitic gneiss, marble, and calc-silicate rock, cross-cut by granite dikes).
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Neogene tectonic evolution of the Alboran sea from MCS data
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References
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Sur un modèle explicatif de l'arc de Gibraltar
TL;DR: In this article, the authors proposed a geometrical model to explain the Gibraltar arc, which takes into account the recent geological discoveries about the Geology of this region, and the concept of Plate Tectonics.
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Seismotectonic of the Azores-Alboran region
TL;DR: In this article, new seismicity and focal-mechanism data from the area of the Azores Islands, in the mid-Atlantic Ridge, to the Alboran Sea and the southern part of Spain are presented.
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Quaternary Strike-Slip Faults in Southeastern Spain
TL;DR: Bousquet et al. as mentioned in this paper reported that three main faults (the Carboneras, Palomares and Alhama de Murcia faults) have been active in Quaternary time.