Recent large fold nucleation in the upper crust: Insight from gravity, magnetic, magnetotelluric and seismicity data (Sierra de Los Filabres–Sierra de Las Estancias, Internal Zones, Betic Cordillera)

Pedrera, Antonio; Galindo-Zaldı́var, Jesús; Ruíz-Constán, Ana; Duque, Carlos; Marín‐Lechado, Carlos; Serrano, Inmaculada

doi:10.1016/j.tecto.2008.09.037

Cited by 24 publications

(36 citation statements)

References 59 publications

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“…Close to Somontín, the Quaternary sediments are deformed by a NW-SE oriented high-dipping fault Augier, 2004;Augier et al, 2005;Meijninger and Vissers, 2006;Pedrera et al, 2007;Pedrera et al, 2010a). The study area was deformed by a succession of kilometric scale folds with orientations ranging from E-W to ENE-WSW: the Sierra de Los Filabres and Sierra de Almagro antiforms, Almanzora corridor synform and Sierra de Las Estancias antiform (Booth-Rea et al, 2003, 2004Pedrera et al, 2007Pedrera et al, , 2009b. The antiforms coincide with the ranges where the metamorphic rocks crop out, while the synforms correspond to the sedimentary basins.…”

Section: Active Tectonic Structuresmentioning

confidence: 99%

“…The eastern Almanzora corridor (Somontín-Partaloa sector) and the western Huércal-Overa basin are both deformed by widespread small-scale contractional tectonic structures, which include WNW-ESE trending dextral faults and ENE-WSW oriented open folds, fault-propagation folds, and reverse faults (Figs. 2 and 3A; Briend et al, 1990;Pedrera et al, 2009a and2009b). Using a geomorphological approach, García-Meléndez (2000) and García-Meléndez et al (2004 GH¿QHG WKH $OER[ IDXOW DV DQ (1(:6: WR (: fault zone with reverse-dextral kinematics that runs from the eastern Huércal-Overa basin as far as the Almanzora corridor to the west.…”

Section: Miocene Tectonic Structuresmentioning

confidence: 99%

“…This fault segment is usually called the Gafarillos fault (Stapel, 1996;Hui-the Gafarillos fault (Stapel, 1996; HuiGafarillos fault (Stapel, 1996;Huibregtse et al, 1998;Jonk and Bierman, 2002) or North Gafarillos fault (Giaconia et al, 2012). The southern (Martínez-Martínez et al, 1995;Martínez-Martínez and Azañón, 1997;Galindo-Zaldívar et al, 2003;Pedrera et al, 2009b). The deformation also propagated southward since the late Tortonian with the development of E-W kilometre-sized folds (Weijermars, 1985) that determined the isolation of the Alpujarra-Tabernas-Sorbas corridor (Fig.…”

Section: Miocene Tectonic Structuresmentioning

confidence: 99%

“…The folds have been interpreted as caused by isostatic rebound in response to extensional denudation along the regional extensional detachments (e.g., Martínez-Martínez et al, 2002;Augier et al, 2005;Meigninger and Vissers, 2006). Alternatively, we consider them as contractional folds developed above upper-crustal detachments developed in a collisional framework (e.g., Weijermars et al, 1985;Montenat and Ott d'Estevou, 1990;Sanz de Galdeano and Vera, 1992;Martínez-Martínez et al, 1995;Galindo-Zaldívar et al, 2003;Sanz de Galdeano and Alfaro, 2004;Pedrera et al, 2009b). In any case, these folds contribute to the uplift of the northern boundary of the Alborán Basin gradually disconnecting the now emerged intramontane basins (Comas et al, 1992(Comas et al, , 1999 and inducing the development of the present-day relief ( Fig.…”

Section: Late Miocene Geodynamic Evolutionmentioning

confidence: 99%

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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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Section: Active Tectonic Structuresmentioning

confidence: 99%

Section: Miocene Tectonic Structuresmentioning

confidence: 99%

Section: Miocene Tectonic Structuresmentioning

confidence: 99%

Section: Late Miocene Geodynamic Evolutionmentioning

confidence: 99%

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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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“…Basins are indeed diversely interpreted as resulting from late-orogenic extensional processes, strike-slip tectonics (e.g. pull-apart basins) or simply flexural synclines [Bousquet and Montenat, 1974;Bousquet et al, 1975;Montenat et al, 1977;Bousquet, 1979;Ott d'Estevou and Montenat, 1990;Mora, 1993;Vissers et al, 1995;Silva et al, 1997;Montenat and Ott d'Estevou, 1999;Poisson et al, 1999;Augier, 2004;Meijninger and Vissers, 2006;Pedrera et al, 2007Pedrera et al, , 2009Pedrera et al, , 2010Pedrera et al, , 2012. In order to test these various interpretations, this study explores the tectonic record of the prominent~E-W-trending Huércal-Overa and Almanzora corridor basins, lying either in the hanging wall of a major extensional shear zone (e.g.…”

Section: Introductionmentioning

confidence: 99%

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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Tectonic inversion of an asymmetric graben: Insights from a combined field and gravity survey in the Sorbas basin

et al. 2014

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The formation of sedimentary basins in the Alboran domain is associated with the exhumation of metamorphic core complexes over a circa 15 Ma period through a transition from regional late-orogenic extension to compression. An integrated study coupling field analysis and gravity data acquisition was performed in the Sorbas basin in the southeastern Betic Cordillera. Detailed field observations revealed for the first time that extensional tectonics occurred before shortening in this basin. Two extensional events were recorded with NW-SE to N-S and NE-SW kinematics, respectively; the first of which being likely responsible for the basin initiation. Tectonic inversion of the basin then occurred around 8 Ma in an overall approximately N-S shortening context. Two-dimensional gravity sections reveal that the basin acted as an active depocenter as the basin floor locally exceeding 2 km depth is characterized by a marked asymmetric architecture. Based on this integrated study, we explore a new evolutionary scenario which can be used as a basis for interpretations of the Neogene tectonic history of the southeastern Betics.

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Recent large fold nucleation in the upper crust: Insight from gravity, magnetic, magnetotelluric and seismicity data (Sierra de Los Filabres–Sierra de Las Estancias, Internal Zones, Betic Cordillera)

Cited by 24 publications

References 59 publications

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

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

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

Tectonic inversion of an asymmetric graben: Insights from a combined field and gravity survey in the Sorbas basin

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