Middle Miocene high‐pressure metamorphism and fast exhumation of the Nevado‐Filábride Complex, SE Spain

Sánchez‐Vizcaíno, Vicente López; Rubatto, Daniela; Gómez-Pugnaire, María Teresa; Trommsdorff, Volkmar; Müntener, Othmar

doi:10.1046/j.1365-3121.2001.00354.x

Cited by 118 publications

(111 citation statements)

References 26 publications

(50 reference statements)

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“…1). Middle Miocene (17-15 Ma) ages for the HP-LT metamorphic event in the Nevado-Filábride (López Sánchez-Vizcaíno et al, 2001;Platt et al, 2006) suggest that this complex is a slab of the Iberian margin that underthrusted the Alborán domain during the Early Miocene collision. The Maláguide complex (Blumenthal, 1930;Foucault and Paquet, 1971) is made of Early Paleozoic to Eocene rocks (Martín-Algarra et al, 2000).…”

Section: Geological Settingmentioning

confidence: 99%

Age of anatexis in the crustal footwall of the Ronda peridotites, S Spain

Acosta-Vigil

Rubatto

Bartoli

et al. 2014

Lithos

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This study investigates the age of anatexis of a crustal sequence constituting the footwall of the Ronda peridotite slab, in the hinterland of the Betic Cordillera (S Spain, region of Istán). These rocks represent a polymetamorphic basement involved in the Alpine orogeny and show an increase in the proportion of melt towards the peridotites. Metamorphic conditions in the migmatites vary between T ≈ 675–750 °C at P ≈ 0.30–0.35 GPa. The timing of metamorphism and deformation of the migmatites around the Ronda peridotites is controversial and has been previously ascribed to either the Alpine or Variscan orogenies. We present U–Pb SHRIMP dating of zircons from six samples collected across the migmatitic sequence that provide a tighter age constraint on the metamorphism. Zircon ages are related to conditions of metamorphism on the basis of the relationships between zircon microstructures and degree of melting recorded by the host rocks. Anatexis occurred during the late stages of the Variscan orogeny (≈ 280–290 Ma), as indicated by ages of euhedral, oscillatory-zoned domains or new crystals in metatexites and diatexites. Thin, U-rich zircon rims that are affected by radiation damage yield discordant scattered dates between ≈ 260 and 30 Ma, which are interpreted as reflecting a thermal and fluid overprint during the Alpine orogeny that produced recrystallization and Pb loss in Permian zircons. This study identifies a previously unknown Variscan domain within the Betic Cordillera, and indicates, in accordance with previous studies, that Variscan basements recycled during the Alpine orogeny that formed the Betic Cordillera preserve pre-Alpine mineral associations and tectonic fabrics

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Section: Geological Settingmentioning

confidence: 99%

Age of anatexis in the crustal footwall of the Ronda peridotites, S Spain

Acosta-Vigil

Rubatto

Bartoli

et al. 2014

Lithos

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“…(Portugal Ferreira et al [61]; Puga et al [13], and zircon from a pyroxenite boudin, hosted by serpentinite from Almirez, was dated as 15 Ma. (López Sanchez-Vizcaíno et al [63]). These later authors considered the dated zircons as formed during a Miocene high-pressure metamorphism meanwhile a discussion against this interpretation may be found in Puga et al [15], pp.…”

Section: Radiometric Dating Of the Boamentioning

confidence: 99%

The Betic Ophiolites and the Mesozoic Evolution of the Western Tethys

et al. 2017

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Abstract:The Betic Ophiolites consist of numerous tectonic slices, metric to kilometric in size, of eclogitized mafic and ultramafic rocks associated to oceanic metasediments, deriving from the Betic oceanic domain. The outcrop of these ophiolites is aligned along 250 km in the Mulhacén Complex of the Nevado-Filábride Domain, located at the center-eastern zone of the Betic Cordillera (SE Spain). According to petrological/geochemical inferences and SHRIMP (Sensitive High Resolution Ion Micro-Probe) dating of igneous zircons, the Betic oceanic lithosphere originated along an ultra-slow mid-ocean ridge, after rifting, thinning and breakup of the preexisting continental crust. The Betic oceanic sector, located at the westernmost end of the Tethys Ocean, developed from the Lower to Middle Jurassic (185-170 Ma), just at the beginning of the Pangaea break-up between the Iberia-European and the Africa-Adrian plates. Subsequently, the oceanic spreading migrated northeastward to form the Ligurian and Alpine Tethys oceans, from 165 to 140 Ma. Breakup and oceanization isolated continental remnants, known as the Mesomediterranean Terrane, which were deformed and affected by the Upper Cretaceous-Paleocene Eo-Alpine high-pressure metamorphic event, due to the intra-oceanic subduction of the Jurassic oceanic lithosphere and the related continental margins. This process was followed by the partial exhumation of the subducted oceanic rocks onto their continental margins, forming the Betic and Alpine Ophiolites. Subsequently, along the Upper Oligocene and Miocene, the deformed and metamorphosed Mesomediterranean Terrane was dismembered into different continental blocks collectively known as AlKaPeCa microplate (Alboran, Kabylian, Peloritan and Calabrian). In particular, the Alboran block was displaced toward the SW to occupy its current setting between the Iberian and African plates, due to the Neogene opening of the Algero-Provençal Basin. During this translation, the different domains of the Alboran microplate, forming the Internal Zones of the Betic and Rifean Cordilleras, collided with the External Zones representing the Iberian and African margins and, together with them, underwent the later alpine deformation and metamorphism, characterized by local differences of P-T (Pressure-Temperature) conditions. These Neogene metamorphic processes, known as Meso-Alpine and Neo-Alpine events, developed in the Nevado-Filábride Domain under Ab-Ep amphibolite and greenschists facies conditions, respectively, causing retrogradation and intensive deformation of the Eo-Alpine eclogites.

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“…Balanyá et al, 1997;Zeck, 1996;Platt et al, 1998Platt et al, , 2003a. Nevertheless, an Early Miocene cluster of radiometric ages is recorded in most of the rocks of the Alboran Domain on the basis of the simultaneous application of thermochronometers with different closure temperatures (Platt and Whitehouse, 1999;Sánchez-Rodrí-guez and Gebauer, 2000;López-Sánchez-Vizcaíno et al, 2001;Platt et al, 2003a;Whitehouse and Platt, 2003). This age cluster has been interpreted as evidence for Early Miocene high-grade metamorphism in the Alboran Domain (Zeck et al, 1992;Platt et al, 1998Platt et al, , 2003aPlatt and Whitehouse, 1999).…”

Section: The Alpujarride Complex In the Central Beticsmentioning

confidence: 99%

“…In particular, it has been interpreted either as the evidence for a thermal pulse followed by rapid exhumation in a post-orogenic extensional regime coeval with the Alboran rifting and the collapse of the Betic chain (e.g. Zeck et al, 1992;Vissers et al, 1995;Platt et al, 1996Platt et al, , 1998Platt et al, , 2003aZeck, 1996;Platt and Whitehouse, 1999;Whitehouse and Platt, 2003) or as the evidence for a metamorphic climax during thickening and subduction of the Alboran Domain (Sánchez-Rodríguez and Gebauer, 2000;López-Sánchez-Vizcaíno et al, 2001). However, the latter interpretations are at odds with the fact that: (i) rare-earth elements in zircon and garnet point to a decompressional signature rather than to the peak of metamorphism for the U/Pb ages obtained from the zircon rims (Whitehouse and Platt, 2003), (ii) metamorphic Alpujarride clasts were included in sedimentary rocks lying over the internal zone (Zeck et al, 1989;Sánchez-Gómez et al, 1995).…”

Section: Age Of Exhumationmentioning

confidence: 99%