Deciphering tectonic‐ and erosion‐driven exhumation of the Nevado–Filábride Complex (Betic Cordillera, Southern Spain) by low temperature thermochronology

Vázquez, M.; Jabaloy, A.; Barbero, L.; Stuart, Finlay M.

doi:10.1111/j.1365-3121.2011.01007.x

Cited by 43 publications

(53 citation statements)

References 27 publications

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“…Indeed, besides the exhumation related to the intense thinning of the Alpujárride complex, most of the NF complex final exhumation is achieved by a set of major top-to-the-W shear zones Augier et al, 2005b;Agard et al, 2011], while the kinematics of the extensional deformation deduced from the basin analysis has a strong N-S component [e.g. Mora, 1993 [Johnson 1993[Johnson , 1995Johnson et al, 1997;Platt et al, 2005;Vázquez et al, 2011] for fission-tracks analyses on zircons and apatites and Vázquez et al [2011] for U-Th/Pb analyses on apatites. Closure-temperatures are discussed in the text.…”

Section: Discussionmentioning

confidence: 99%

“…However, to date, relationships between the exhumation of Alpine metamorphic rocks and the formation of intramontane basins only rely on the simultaneity of the latest exhumation stages of the NF complex [Johnson, 1993;Johnson et al, 1997;Vázquez et al, 2011] and the deposition of Miocene sediments carrying the first NevadoFilábride detritus [Ruegg, 1964;Kleverlaan, 1989;Briend et al, 1990;Mora, 1993;Poisson et al, 1999;Vissers et al, 1995;Pascual-Molina, 1997;Augier, 2004;Meijninger and Vissers, 2006]. This interpretation is however questioned by the kinematics of the deformation recorded along the FSZ and in the hanging wall unit carrying the basins.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the recognition of low-angle extensional shear zones able to exhume deep-seated metamorphic rocks sometimes equilibrated in eclogitic conditions rather suggests a late-orogenic collapse [Platt and Vissers, 1989;García-Dueñas et al, 1992;Jabaloy et al, 1993;Vissers et al, 1995;Martínez-Martínez et al, 2002Augier et al, 2005b;Agard et al, 2011] active as recently as the Late-Miocene [Monié et al, 1994;Johnson et al, 1997;Augier et al, 2005c;Platt et al, 2005;Vázquez et al, 2011]. In parallel, extensional structures, with variable kinematics have also been described in the onshore basins [e.g.…”

Section: Introductionmentioning

confidence: 98%

“…Despite a limited data set, the last ductile deformation (D3 d ) shows a good consistency with respect to the subsequent brittle deformation. Timing of brittle deformation is constrained by the whole spectrum of near-surface thermochronometers from 12 to 8 Ma [Johnson, 1993;Johnson et al, 1997;Vázquez et al, 2011].…”

Section: Structure and Kinematics Of The Nevado-filabríde Complexmentioning

confidence: 99%

“…Augier et al, 2005c]. Final exhumation stages, constrained by fission-tracks (FT) and U-Th/He cooling ages took place from 11.9 ± 0.9 Ma (FT on zircons), 8.9 ± 2.9 Ma (FT on apatites), and 8.7 ± 0.7 Ma for recent U-Th/He analysis on apatites [Johnson et al, 1997;Vázquez et al, 2011]. As FT on apatites reveal that the Alpujárride complex reached the surface at ca.…”

Section: Introductionmentioning

confidence: 99%

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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: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Structure and Kinematics Of The Nevado-filabríde Complexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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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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Heterogeneous extension and the role of transfer faults in the development of the southeastern Betic basins (SE Spain)

et al. 2014

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Large strike-slip faults in the eastern Betics are interpreted to have developed in a transcurrent setting in response to 4-6 mm/yr of Africa-Iberia NW-SE convergence. However, here we show that some of these faults are transfer faults accommodating heterogeneous late Miocene extension. The North Cabrera dextral fault and other E-W to NE-SW strike-slip faults in the Sorbas basin were transfer faults produced under SW-NE extension. These faults together with related normal faults form the main boundaries of two sedimentary depocenters active between the Serravallian and the Tortonian. The older North Cabrera depocenter extended between the Serravallian and the early Tortonian (approximately 13.8 to 9 Ma), while the younger Gacía depocenter formed in response to late Tortonian extension (approximately 9 to 7.5 Ma). The latter formed to the west of the North Cabrera depocenter by a listric fan of normal faults with SW directed transport that are linked by dextral and sinistral transfer fault segments. These faults root on a low-angle detachment cutting into the exhumed high-pressure Nevado-Filabride complex rocks at~0.8 km depth. The present work reveals that (1) this extension was partially coeval with and kinematically linked to sinistral displacement along the Carboneras fault farther south in the Níjar basin; (2) this westward directed extension produced elongated core complexes and tilted blocks to the north of the Carboneras fault and magmatic accretion upon thinned continental crust to the south, probably in response to slab tearing or detachment and associated edge delamination of the Iberian continental lithospheric mantle beneath the Betics.

show abstract

Deciphering tectonic‐ and erosion‐driven exhumation of the Nevado–Filábride Complex (Betic Cordillera, Southern Spain) by low temperature thermochronology

Cited by 43 publications

References 27 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

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

Heterogeneous extension and the role of transfer faults in the development of the southeastern Betic basins (SE Spain)

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