Basement structure of the Granada basin, Betic Cordilleras, southern Spain

Morales, J.; Vidal, F.; Miguel, F. De; Alguacil, Gerardo; Posadas, A. M.; Ibáñez, Jesús M.; Guzmán, Ana; Guirao, José María

doi:10.1016/0040-1951(90)90394-n

Cited by 51 publications

(27 citation statements)

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“…The Huércal-Overa and the Almanzora corridor basins are thus initially purely extensional basins as already proposed [Mora, 1993;Vissers et al 1995;Augier et al 2005b;Meijninger and Vissers, 2006] but this study reveals how the basins developed during the exhumation of the NF complex and sheds lights on the evolution of the FSZ thought time. At larger-scale, an overall half-graben architecture has already been reported based on seismic profiles analysis for the Granada [Morales et al, 1990;Ruano et al, 2004], the Fortuna-Guadalentín basins [Amores et al, 2001; or in the Alboran sea [Comas et al, 1992[Comas et al, , 1999Mauffret et al, 1992;Watts et al, 1993]. It is also noteworthy that existing compilations of tectonic subsidence of onland basins ( fig.…”

Section: Discussionmentioning

confidence: 92%

From ductile to brittle, late- to post-orogenic evolution of the Betic Cordillera: Structural insights from the northeastern Internal zones

Augier

Jolivet

Couto

et al. 2013

Bulletin De La Société Géologique De France

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Abstract. -Relations between Alpine detachment-bounded metamorphic domes, crustal-scale strike-slip fault zones and sedimentary basins in the Internal zones of the Betic cordillera are still matter of debate. Current tectonic interpretations of these basins vary from late-orogenic extensional structures to compressional ones associated with strike-slip motions along major still active faults. Structural investigations including new field mapping, meso-scale faults recognition, palaeostress analysis of brittle small-scale faults systems were performed in the sedimentary cover of the Almanzora corridor and the Huércal-Overa basins, located either in the hanging wall unit of the Filabres extensional shear zone or at the termination of the Alhama de Murcia sinistral fault zone. In parallel, a detailed study of the ductile and the ductile-brittle deformation was carried out in the footwall unit of the Filabres extensional shear zone, in the NevadoFílabride complex. Three main brittle events were recognised in the basin cover including two extensional events that occurred prior to a weak tectonic inversion of the basin during a third, still active event. The first one, D1 b is characterized by the development a first stress regime consistent with~NW-SE extensional tectonics. Besides, the consistency between the latest ductile and the brittle kinematics for the Filabres extensional shear zone and the activity of meso-scale fault systems that primarily control the main SW-NE depocentres allow concluding to a top-to-the-NW continuum of strain during the final exhumation of the Nevado-Filábride complex. The resulting overall half-graben architecture of the basins is then related to the combination of the formation of the metamorphic domes that added a local control superimposed on the regional deformation. Indeed, after a consistent top-to-the-west shearing prevailing during most of the Nevado-Filábride exhumation, final exhumation stages were in turn, characterised by important kinematics changes with a subordinate top-to-the-NW sense of shear (D1 b ). The onset of sedimentation in the basins occurred shortly after the crossing of the ductile-brittle transition in the underlying metamorphic domes at ca. 14 Ma into SW-NE fault-bounded troughs. Tectonic subsidence was then maintained during D2 b while extensional kinematics changed to N-S or even locally to SSW-NNE. Extensional tectonics then lasted most of the Tortonian during the final tectonic denudation increments of the Sierra de los Filabres achieved at ca. 9-8 Ma. Intramontane basins are therefore genuinely extensional and clearly related to the latest exhumation stages of the Nevado-Filábride complex in the back-arc domain. Conversely, at ca. 8 Ma, basins started to record a~N-S to NNW-SSE compressional stress regime (D3 b ) and ceased to be active depocentres while shortening within the Internal zones then recorded only the Iberia/Africa convergence. The weak inversion of the basins however resulted either in the reactivation of originally extensional faults such ...

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Section: Discussionmentioning

confidence: 92%

From ductile to brittle, late- to post-orogenic evolution of the Betic Cordillera: Structural insights from the northeastern Internal zones

Augier

Jolivet

Couto

et al. 2013

Bulletin De La Société Géologique De France

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“…A combined interpretation of wide‐angle and deep seismic reflection data indicate that the present‐day crustal thickness varies from 15 to 20 km in the Alboran Sea and in the Valencia Trough to 35–38 km in the central part of the Internal Zones, west of Granada (Banda & Ansorge, 1980; Morales et al ., 1990; Cloetingh et al ., 1992; Torné & Banda, 1992; Van Der Beek & Cloetingh, 1992; Watts & Torné, 1992b; Collier et al ., 1994; Maillard & Mauffret, 1999). It is difficult to determine the present‐day thickness of the lithosphere, but Torné et al .…”

Section: Geological Setting and Stratigraphymentioning

confidence: 99%

Subsidence analyses from the Betic Cordillera, southeast Spain

2003

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Fifty-four Mesozoic±Cenozoic stratigraphic sections from the Betic Cordillera of southeast Spain have been analysed in order to estimate the timing and amount of lithospheric stretching that occurred at the western end of the Tethyan Ocean since the Hercynian Orogeny. The standard backstripping technique has been used in order to calculate the water-loaded subsidence of basement for each section. Water-loaded subsidence curves were then inverted in order to determine the variation of lithospheric strain rate as a function of time, which yields estimates of timing, magnitude and intensity of stretching.Rifting commenced during the Late Permian/Early Triassic times and continued intermittently throughout the Mesozoic in response to the opening of the Tethyan Ocean to the east and the opening of the Atlantic Ocean to the west. Two major events in the Permo-Triassic/Early Jurassic and the Late Jurassic/Early Cretaceous can be clearly identified. Stretching factors are generally small (1.1±1.25) probably because the Betic Cordillera was located at the westernmost end of the Tethys.Peak strain rates of~10 À15 s À1 were obtained for Mesozoic rift events and these values are in broad agreement with those obtained throughout the Tethyan Realm. We have also analysed the Neogene extensional event, which played an important role in forming the existing Mediterranean Sea. A combination of well-log information and calibrated seismic reflection data was modelled. Peak strain rates in these younger basins are almost one order of magnitude faster than those estimated for the Mesozoic basins. These higher values appear to be typical of back-arc extensional basins elsewhere. To the west and north of the Betic Cordillera, the Guadalquivir foreland basin developed as extension took place further east. Backstripped sections from this basin clearly record the northward migration of foreland basin subsidence through time.

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“…Several recent studies of the metamorphic rocks from the Internal Zones have provided evidence for rapid exhumation and associated extension of a previously thickened crust (Platt & Vissers, 1989; Jabaloy et al ., 1992; Vissers et al ., 1995), which started in the late Oligocene–early Miocene and continued well into the Miocene (Monie et al ., 1994; Johnson et al ., 1997; Lonergan & Johnson, 1998; de Jong, 2003; Platt et al ., 2005). Seismic studies of the Granada (Morales et al ., 1990; Ruano et al ., 2004) and Fortuna‐Guadalentin Basins (Amores et al ., 2001 and 2002), and detailed structural and sedimentological studies, e.g. of the Huercal Overa Basin (Mora Gluckstadt, 1993), demonstrate the existence of late Miocene half graben structures.…”

Section: Introductionmentioning

confidence: 99%

Miocene extensional basin development in the Betic Cordillera, SE Spain revealed through analysis of the Alhama de Murcia and Crevillente Faults

2006

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The Alhama de Murcia and Crevillente faults in the Betic Cordillera of southeast Spain form part of a network of prominent faults, bounding several of the late Tertiary and Quaternary intermontane basins. Current tectonic interpretations of these basins vary from late‐orogenic extensional structures to a pull‐apart origin associated with strike–slip movements along these prominent faults. A strike–slip origin of the basins, however, seems at variance both with recent structural studies of the underlying Betic basement and with the overall basin and fault geometry. We studied the structure and kinematics of the Alhama de Murcia and Crevillente faults as well as the internal structure of the late Miocene basin sediments, to elucidate possible relationships between the prominent faults and the adjacent basins. The structural data lead to the inevitable conclusion that the late Miocene basins developed as genuinely extensional basins, presumably associated with the thinning and exhumation of the underlying basement at that time. During the late Miocene, neither the Crevillente fault nor the Alhama de Murcia fault acted as strike–slip faults controlling basin development. Instead, parts of the Alhama de Murcia fault initiated as extensional normal faults, and reactivated as contraction faults during the latest Miocene–early Pliocene in response to continued African–European plate convergence. Both prominent faults presently act as reverse faults with a movement sense towards the southeast, which is clearly at variance with the commonly inferred dextral or sinistral strike–slip motions on these faults. We argue that the prominent faults form part of a larger scale zone of post‐Messinian shortening made up of SSE‐ and NNW‐directed reverse faults and NE to ENE‐trending folds including thrust‐related fault‐bend folds and fault‐propagation folds, transected and displaced by, respectively, WNW‐ and NNE‐trending, dextral and sinistral strike–slip (tear or transfer) faults.

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Basement structure of the Granada basin, Betic Cordilleras, southern Spain

Cited by 51 publications

References 4 publications

From ductile to brittle, late- to post-orogenic evolution of the Betic Cordillera: Structural insights from the northeastern Internal zones

From ductile to brittle, late- to post-orogenic evolution of the Betic Cordillera: Structural insights from the northeastern Internal zones

Subsidence analyses from the Betic Cordillera, southeast Spain

Miocene extensional basin development in the Betic Cordillera, SE Spain revealed through analysis of the Alhama de Murcia and Crevillente Faults

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