The evolution of the footwall to the Ronda subcontinental mantle peridotites: insights from the Nieves Unit (western Betic Cordillera)

Mazzoli, Stefano; Martín‐Algarra, Agustín; Reddy, Steven M.; Sánchez‐Vizcaíno, Vicente López; Fedele, Lorenzo; Noviello, A.

doi:10.1144/jgs2012-105

Cited by 38 publications

(75 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, geophysical studies support this idea: for instance, Gutscher et al (2002) and Spakman and Wortel (2004) recently described evidence of an active subduction area with thrusts and earthquakes up to 600 km depth. Our results are also compatible with the conclusions of Mazzoli and Martín-Algarra (2011), Vergés and Fernández (2012), and Mazzoli et al (2013). They showed that Miocene emplacement of the Ronda peridotites may be interpreted in terms of deformation partitioning (i.e., orogen-parallel strike-slip and orogen-perpendicular thrusting) associated with oblique convergence during continental subduction and subsequent exhumation involving the coeval activity of kinematically linked systems of reverse, strike-slip, and and normal-sense shear zones.…”

Section: Geodynamic and Regional Implications-a Consistent Emplacemensupporting

confidence: 93%

Crustal attenuation as a tracer for the emplacement of the Beni Bousera ultramafic massif (Betico-Rifean belt)

Álvarez-Valero

Jagoutz

Stanley

et al. 2014

Geological Society of America Bulletin

View full text Add to dashboard Cite

The study of petrology (fi eldwork, petrography, and phase diagram modeling) and structural data of the metapelitic granulites and the southern, high-temperature exposed peridotites in the Beni Bousera massif (northern Morocco), combined with results from previous regional studies of the Alborán, suggest a new emplacement mechanism for the mantle rocks in the Betico-Rifean belt. We document two key metamorphic episodes in the granulites within a temperature window of 710-830 ± 50 °C: (1) An earlier prograde high-pressure period (from 9 ± 1.0 to 12 ± 1.0 kbar) characterized by the assemblage garnet + biotite + kyanite + K-feldspar + rutile. Pressure differences of ~3 kbar are found over a continuous crustal section of ~1.5 km of exposed granulites that indicate a significant crustal attenuation during exhumation of the ultramafi c rocks; and (2) a later postkinematic low-pressure (5 ± 0.8 kbar) symplectic assemblage of cordierite + spinel + plagioclase + sillimanite.At the scale of the entire Betico-Rifean belt, two main contacts are observed as mirror images in both sides of the Alborán Sea:(1) the long axis of the high-temperature ductile contact between granulites and peridotites occurs in the west side of the Beni Bousera and Ronda massifs, coupled with (2) the consistent high-angle, east-dipping normal fault in the east parts of the belt massifs. The integration of the petrologic results with information on the rotation of both contacts reveals ductile deformation in the lower crust related to the emplacement of the ultramafi c rocks in the Betico-Rifean belt along deep-reaching normal faults. The presence of the early hightemperature contact suggests that it was originally a shallow, west-dipping detachment fault developed in a back-arc environment of the east-dipping, retreating subduction zone (current western part of the Gibraltar arc).This scenario is in concordance with the tectonic evolution in western Italy, where anticlockwise Pleistocene rotations associated with northeast-directed thrusting in the Apennines-and coeval with the southeastward motion in the Calabria-Peloritani terrane-were triggered by retreat and rollback of the Adriatic-Ionian slab toward the southeast during the northwest-directed subduction beneath the Calabrian arc.

show abstract

Section: Geodynamic and Regional Implications-a Consistent Emplacemensupporting

confidence: 93%

Crustal attenuation as a tracer for the emplacement of the Beni Bousera ultramafic massif (Betico-Rifean belt)

Álvarez-Valero

Jagoutz

Stanley

et al. 2014

Geological Society of America Bulletin

View full text Add to dashboard Cite

show abstract

“…4) (Bourgois, 1978;Martín-Algarra and Estévez, 1984). Note that high-temperature metamorphism has been recently described in Dorsale Units located immediately below the peridotites (forsterite in dolomitic marble, Mazzoli et al, 2013). From the above metamorphic arguments, we propose that the "Blanca" rocks and the Dorsale Units correspond to the same tectonic unit (i.e.…”

Section: Accepted Manuscriptmentioning

confidence: 54%

Structural record of Lower Miocene westward motion of the Alboran Domain in the Western Betics, Spain

2015

View full text Add to dashboard Cite

International audienceIn the framework of the Africa-Europe convergence, the Mediterranean system presents a complex interaction between subduction rollback and upper-plate deformation during the Tertiary. The western end of the system shows a narrow arcuate geometry across the Gibraltar arc, the Betic-Rif belt, in which the relationship between slab dynamics and surface tectonics is not well understood. The present study focuses on the Western Betics, which is characterized by two major thrusts: 1/ the Internal/External Zone Boundary limits the metamorphic domain (Alboran Domain) from the fold-and-thrust belts in the External Zone; 2/ the Ronda Peridotites Thrust allows the juxtaposition of a strongly attenuated lithosphere section with large bodies of sub-continental mantle rocks on top of upper crustal rocks. New structural data show that two major E-W strike-slip corridors played a major role in the deformation pattern of the Alboran Domain, in which E-W dextral strike-slip faults, N60 thrusts and N140 normal faults developed simultaneously during dextral strike-slip simple shear. Olistostromic sediments of Lower Miocene age were deposited and deformed in this tectonic context and hence provide an age estimate for the inferred continuous westward translation of the Alboran Domain that is accommodated by an E-W lateral (strike-slip) ramp and a N60 frontal thrust. The crustal emplacement of large bodies of sub-continental mantle may occur at the onset of this westward thrusting in the Western Alboran domain. At lithosphere-scale, we interpret the observed deformation pattern as the subduction upper-plate expression of a lateral slab tear and its westward propagation since Lower Miocene

show abstract

“…Field structural observations and geological mapping were conducted in the study area to update the brittle tectonic structures from previous geological maps (Martín-Algarra, 1987;Pistre et al, 2002;Mazzoli and Martín-Algarra, 2011;Mazzoli et al, 2013). Fracture sets were defined on the basis of strike, dip, kinematics, and size as defined in the field.…”

Section: Methodsmentioning

confidence: 99%

“…1). Tectonic structures of the Frontal Units in the Sierra de las Nieves have been established by Martín-Algarra (1987), Mazzoli and Martín-Algarra (2011) and Mazzoli et al (2013) (Martín-Algarra, 1987). The succession of the Nieves Unit is capped by Aquitanian (~23 my) continental carbonate breccias, the Nava Breccia Formation (Dürr et al, 1960(Dürr et al, -1962Martín-Algarra and Estevez, 1984).…”

Section: Structure Of the Frontal Units In Sierra De Las Nievesmentioning

confidence: 99%

See 1 more Smart Citation

Structural controls on karstic conduits in a collisional orogen (Sierra de las Nieves, Betic Cordillera, S Spain)

et al. 2015

View full text Add to dashboard Cite

The evolution of the footwall to the Ronda subcontinental mantle peridotites: insights from the Nieves Unit (western Betic Cordillera)

Cited by 38 publications

References 65 publications

Crustal attenuation as a tracer for the emplacement of the Beni Bousera ultramafic massif (Betico-Rifean belt)

Crustal attenuation as a tracer for the emplacement of the Beni Bousera ultramafic massif (Betico-Rifean belt)

Structural record of Lower Miocene westward motion of the Alboran Domain in the Western Betics, Spain

Structural controls on karstic conduits in a collisional orogen (Sierra de las Nieves, Betic Cordillera, S Spain)

Contact Info

Product

Resources

About