The Mecina Extensional System: Its relation with the post-Aquitanian piggy-back Basins and the paleostresses evolution (Betic Cordilleras, Spain)

Jabaloy, A.; Galindo-Zaldı́var, Jesús; González-Lodeiro, Francisco

doi:10.1007/bf02084918

Cited by 48 publications

(40 citation statements)

References 13 publications

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“…1 and 8). It is known that in this time the continental crust of the Alboran Sea thinned, reaching only 15 km in several places (Boloix and Hatzfeld, 1977); this extension affected also the Betic and Rif internal zones situated onshore (Garcla-Duefias et al, 1992;Jabaloy et al, 1992). Simultaneously, important horizontal westward displacements occurred in internal zones of the Betic and Rif cordilleras (Andrieux et al, 1971;DurandDelga and Fontbot6, 1980;Wildi, 1983 .…”

Section: Massifsmentioning

confidence: 96%

Seismotectonics of the Ibero-Maghrebian region

1995

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Section: Massifsmentioning

confidence: 96%

Seismotectonics of the Ibero-Maghrebian region

1995

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“…Eastwards the corridor extends to the Tabernas basin, which continues into the Sorbas-Vera basin, between Sierra de Los Filabres to the north and Sierra Alhamilla and Sierra Cabrera to the VRXWK )LJV DQG 7KHVH EDVLQV DUH SDUWLDOO\ ¿OOHG with lower Miocene to Quaternary deposits and constitute a zone of crustal weakness where recent and active deformation structures are nucleated Rodríguez-Fernández, 1982). Researchers agree on the presence throughout this area of a main right-lateral fault zone (e.g., Sanz de Galdeano et al, 1985;Galindo-Zaldívar, 1986;Sanz de Galdeano, 1989;Jabaloy et al, 1992;Galindo-Zaldívar et al, 2003;Martínez-Díaz and Hernández-Enrile, 2004;Martínez-Martínez et al, 2006;Sanz de Galdeano et al, 2010). However, controversy persists concerning the deep continuity of the structures, the relationships of the exposes faults with seismicity, the driving mechanisms, and in some cases the age of fault activity.…”

Section: Kh $Osxmduudq Fruulgru Wkh 7dehuqdv Edvlq Dqg the Sorbas-vementioning

confidence: 99%

Recent and active faults and folds in the central-eastern Internal Zones of the Betic Cordillera

Pedrera

Galindo-Zaldı́var

Marín‐Lechado

et al. 2012

Journal of Iberian Geology

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The most recent tectonic structures of the central-eastern Internal Zones of the Betic Cordillera (from 3.1ºW to 1.7ºW and to the south of 37.525ºN) include fault and folds developed from the Late Miocene onwards, which are related to N-S/NW-SE directed continental collision and moderate thickening of a crust that is relatively hot at depth. In this setting, E-W to WSW-ENE folds, with locally associated E-W transpressive right-lateral and reverse faults, favoured the emersion of the northern Alborán basin palaeomargin and the progressive intramontane basin disconnection. The NNE-SSW to NE-SW trending regional left-lateral Palomares and Carboneras fault zones are dominant structures in the easternmost part of the cordillera. In addition, NW-SE to WNW-ESE trending normal and oblique-slip normal faults are widespread. The collision is still active and continues to drive active folds and faults, some probably being the likely source of moderate-sized earthquakes. The Campo de Dalías and surrounding sectors, deformed by active ENE-WSW folds and NW-SE to WNW-ESE oblique-slip normal faults, are probably the sites with the largest FRQFHQWUDWLRQ RI VLJQL¿FDQW HDUWKTXDNHV GXULQJ UHFHQW \HDUV 0RGHUDWHPDJQLWXGH HDUWKTXDNHV 0Z WR KDYH RFFXUUHG WKHUH at fairly regular intervals, in 1804, 1910, and 1994. Toward the east, NW-SE trending normal faults extending from Almería to the Tabernas basin deform the Quaternary rocks with associated moderate seismicity (the 2002 Gergal Mw 4.7 earthquake, and possibly the 1894 Nacimiento earthquake, felt with intensity VII). In the Sorbas-Vera basin, the Palomares fault zone is also responsible for moderate-sized earthquakes (1518 Vera earthquake). In the Almanzora corridor, NW-SE to WNW-ESE trending Lúcar-Somontín faults also could be considered one of the possible source of moderate-magnitude seismicity (1932 Lúcar, Mw 4.8 earthquake felt ISSN (print): 1698-6180. ISSN (online): 1886

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“…The opening of the North Atlantic during the Late Cretaceous and Tertiary induced the rotational divergence of North America and Eurasia, which was paralleled by the counter clockwise convergence of Africa and Eurasia. The northwards drift of Africa caused the progressive closure of oceanic basins of Tethys and the rapid westward propagation of the Alpine Betic-Rif orogenic collision front in the Gulf of Cadiz, in parallel with the development of the western Mediterranean basins (Dewey et al, 1989;García-Dueñas et al, 1992;Jabaloy et al, 1992;Maldonado et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Seismic anisotropy and velocity structure beneath the southern half of the Iberian Peninsula

Serrano

Hearn

Morales

et al. 2005

Physics of the Earth and Planetary Interiors

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Travel times of 11,612 Pn arrivals collected from 7675 earthquakes are inverted to image the uppermost mantle velocity and anisotropy structure beneath the southern half of the Iberian Peninsula and surrounding regions. Pn phases are routinely identified and picked for epicentral distances from 200 to 1200 km. The method used in this study allows simultaneous imaging of variations of Pn velocity and anisotropy. The results show an average uppermost mantle velocity beneath the study area of 8.0 km/s. The peninsular area covered by the Iberian massif is characterized by high Pn velocity, as expected in tectonically stable regions, indicating areas of the Hercynian belt that have not recently been reactivated. The margins of the Iberian Peninsula have undergone a great number of recent tectonic events and are characterized by a pronouncedly low Pn velocity, as is common in areas greatly affected by recent tectonic and magmatic activity. Our model indicates that the Betic crustal root might be underlined by a negative anomaly beneath the southeastern Iberian Peninsula. In the Atlantic Ocean, we find a sharp variation in the uppermost mantle velocities that coincides with the structural complexity of the European and African plate boundary in the Gulf of Cadiz. Our results show a very pronounced low-velocity anomaly offshore from Cape San Vicente whereas high velocities are distributed along the coast in the Gulf of Cadiz. In the Alboran Sea and northern Morocco, the direction of the fastest Pn velocity found is almost parallel to the Africa-Eurasia plate convergence vector (northwest-southeast) whereas to the north, this direction is almost parallel to the main trend of the Betic Cordillera, i.e. east-west in its central part and north-south in the curvature of the Arc of Gibraltar. This suggests that a significant portion of the uppermost mantle has been involved in the orogenic deformation that produced the arcuate structure of the Betic Cordillera. However, we assume that the Neogene extension had no major influence on a lithospheric scale in the Alboran Sea. Our results also show a quite complex pattern of anisotropy in the southwest Iberian lithospheric mantle since the relationship between the direction of fastest Pn velocity and major Hercynian tectonic trends cannot be directly established.

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The Mecina Extensional System: Its relation with the post-Aquitanian piggy-back Basins and the paleostresses evolution (Betic Cordilleras, Spain)

Cited by 48 publications

References 13 publications

Seismotectonics of the Ibero-Maghrebian region

Seismotectonics of the Ibero-Maghrebian region

Recent and active faults and folds in the central-eastern Internal Zones of the Betic Cordillera

Seismic anisotropy and velocity structure beneath the southern half of the Iberian Peninsula

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