Structural and kinematic constraints to the exhumation of the Alpujarride Complex (Central Betic Cordillera, Spain)

Rossetti, Federico; Faccenna, Claudio; Crespo‐Blanc, Ana

doi:10.1016/j.jsg.2004.10.008

Cited by 43 publications

(57 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These attributes, which are to be expected in contractional belts [Butler and Freeman, 1996] support the interpretation that (D 4 ) shear zones operated as thrust zones. Consequently, the transition from D 4 to D 5 phase corresponds to the switch from a compressional to an extensional tectonic regime maintaining the same shear sense as has also been described in other HP metamorphic complexes [e.g., Rossetti et al, 2005]. Therefore, Oligoceneearly Miocene decompression of the blueschist rocks during D 4 seems to have occurred under a compressional [Xypolias et al, 2003;Ring et al, 2007;Chatzaras et al, 2011;Keiter et al, 2011] rather than extensional exhumation mechanism [Gautier and Brun, 1994;Trotet et al, 2001;Ziv et al, 2010].…”

Section: Exhumation Stagesupporting

confidence: 58%

Subduction‐ and exhumation‐related structures in the Cycladic Blueschists: Insights from south Evia Island (Aegean region, Greece)

et al. 2012

View full text Add to dashboard Cite

[1] Detailed geological mapping, structural investigation and amphibole chemistry analyses in southern Evia (Aegean Sea, Greece) allow us to place new constraints on the internal structural architecture and tectonic evolution of the Cycladic Blueschists. We show that the early deformation history was related to ESE directed thrusting resulting in the stacking of the Styra and Ochi nappes, which constitute the Cycladic Blueschist unit in Evia. These early thrust movements initiated just before and proceeded at peak conditions of the Eocene high-pressure metamorphism. Subsequent constrictional deformation gave rise to E-W trending upright folding accomplished at the early exhumation stage. The main ductile-stage exhumation occurred during a single deformation phase associated with the decompression of blueschist rocks from the stability field of crossite to that of actinolite. This phase was characterized by localization of ductile deformation into a series of major, tens of meters thick, ENE directed shear zones, which cut up-section in their transport direction and restack the early thrust and fold sequence, locally bringing the structurally lower Styra nappe over the higher Ochi nappe. It is suggested that these zones operated as thrusts rather than normal sense shear zones as has been previously argued and were possibly formed during the Oligocene ENE-ward extrusion of the blueschists. Brittle-ductile NE dipping normal faulting of post-early Miocene age was probably responsible for the final exhumation of rocks.Citation: Xypolias, P., I. Iliopoulos, V. Chatzaras, and S. Kokkalas (2012), Subduction-and exhumation-related structures in the Cycladic Blueschists:

show abstract

Section: Exhumation Stagesupporting

confidence: 58%

Subduction‐ and exhumation‐related structures in the Cycladic Blueschists: Insights from south Evia Island (Aegean region, Greece)

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The south edge of the Ronda peridotite is also marked by large‐scale normal faults that extend eastward along strike. This brittle deformation has been attributed to the Miocene extensional event that led to the final exhumation of the Alpujarride crust in the internal Betics [ Rossetti et al ., , and references therein]. In relation to that, Monié et al .…”

Section: Geological Settingmentioning

confidence: 89%

“…The internal Betics expose three nappe complexes, from bottom to top: (1) the Nevado‐Filábride complex that recorded variable degrees of metamorphism from high pressure/low temperature to low pressure (LP)/high temperature (HT) during the Miocene [ Puga et al ., ; Augier et al ., ; Platt et al ., ], (2) the Alpujarride complex that also recorded variable metamorphic conditions from high pressure/low temperature during the late Eocene–Oligocene to LP/HT during the Oligocene–early Miocene [ Balanyá et al ., ; Azañon and Crespo‐Blanc , ; Azañon and Goffé , ; Rossetti et al ., ; Platt et al ., , ], and (3) the Malaguide complex that only recorded very low grade metamorphism [ Lonergan , ].…”

Section: Geological Settingmentioning

confidence: 99%

Deformation and exhumation of the Ronda peridotite (Spain)

et al. 2013

View full text Add to dashboard Cite

[1] The Ronda peridotite supplies one of the best objects to document subcontinental mantle deformation, but its internal deformation and exhumation mechanisms remain controversial. Here we provide new structural data and numerical results that constrain the Oligocene-Miocene deformation history of the Ronda massif. We first describe a mantle shear zone in the northern massif that developed subcrustal strain localization during decompression and related partial melting. The deformation regime of this mantle shear zone evolved from penetrative NE-SW stretching to sinistral shear highlighted by discrete shear bands. We then show structural observations that document a viscous deformation in the southern massif occurring prior to the thrust-assisted emplacement of the peridotite during large decompression. Finally, we performed numerical investigations that quantify a high temperature of 980°C for the basal peridotite lens at the time of its crustal emplacement. Our numerical results constrain the timing of ductile deformation of the peridotite just before 22 Ma, probably between 30 and 22 Ma. Altogether, these features led us to conclude that the deformation and exhumation of the Ronda peridotite results from lithosphere thinning subsequently inverted in the course of the Oligocene-Miocene. Among available models, our findings support the hypothesis of peridotite exhumation by the inversion of a thinned back-arc continental lithosphere during westward slab rollback through the Alboran region.

show abstract

“…The boundary separating the two opposite subductions corresponds to a transform fault of the originally segmented Ligurian Tethys [Schettino and Turco, 2011;Frizon de Lamotte et al, 2011]. Rollback of the southeast-dipping 'Betics' subduction started in Oligocene-Early Miocene times, in association with the exhumation of HP-LT Alpujarride metamorphic rocks [Monié et al, 1994;Rossetti et al, 2005;Behr and Platt, 2012]. Exhumed metamorphic material would follow the retreating subduction hinge, pushed by the uplifted lithosphere-asthenosphere boundary in the back-arc area (i.e.…”

Section: New Views On the "Alboran Domain"mentioning

confidence: 99%

The Alboran domain in the western Mediterranean evolution: the birth of a concept

Casciello

Fernàndez

Vergés

et al. 2015

Bulletin De La Société Géologique De France

View full text Add to dashboard Cite

Since the early 70's the majority of tectonic reconstructions of the western Mediterranean employ the Alboran domain notion as a migrating microcontinent or landmass mainly composed of Paleozoic-Triassic rocks affected by 'Alpine' HP-LT metamorphism. For nearly three decades, since the mid-80's, the Alboran domain was considered as a fragment of the Alpine chain that moved westward, colliding into Iberia and North Africa to produce the Gibraltar arc and Betic-Rif chain. In 2012, a new hypothesis for the evolution of the western Mediterranean was presented in which the Betic-Rif orogenic chain originates from rollback of an initially SE-dipping subduction of the westernmost segments of the Ligurian-Tethys under the Africa margin. This interpretation considers the metamorphic 'Alboran domain' rocks as crustal successions of the hyper-extended African and Iberian continental margins, which have undergone a complete subduction-exhumation cycle above a NW-to W-retreating subduction. A key outcome of this hypothesis is that the Alboran domain is not a fragment of the Alpine chain but a consequence of rollback dynamics.In this contribution we try to elucidate the historical reasons behind the classical 'Alpine' interpretation of the Betic-Rif, by briefly describing key contributions, which appear linked in a logical sequence that traces the evolution of the Alboran domain concept since its original formulation by Andrieux and coauthors in 1971. Le domaine d'Alboran dans l'évolution de la Méditerranée occidentale : la naissance d'un conceptMots-clés. -Orogène Bétique-Rif, Arc de Gibraltar, Apennins, Aperçu historique, Evolution géodynamique.Résumé. -Depuis le début des années 70 la majorité des reconstructions tectoniques de la Méditerranée occidentale dé-finissent le domaine d'Alboran comme un microcontinent ou une masse continentale principalement composée de roches paléozoïques et triasiques affectées par un métamorphisme « alpin » HP-BT. Durant près de trois décennies, depuis le milieu des années 80, le domaine d'Alboran était considéré comme un fragment de la chaîne alpine qui s'était dépla-cé vers l'ouest et était entré en collision avec l'Ibérie et l'Afrique du Nord pour former l'arc de Gibraltar et la chaîne bé-tique-Rif. En 2012, une hypothèse nouvelle a été présentée pour l'évolution de la Méditerranée occidentale, pour laquelle la chaîne bétique-Rif proviendrait du retrait d'une subduction des segments les plus occidentaux de la Tethys ligure plongeant initialement vers le SE sous la marge africaine. Cette interprétation considère les roches métamorphiques du « domaine d'Alboran » comme des séries crustales des marges continentales africaine et ibérique hyper-amincies et ayant subi un cycle complet de subduction-exhumation au-dessus d'une subduction en retrait en direction NW-W. Un résultat clef de cette hypothèse est que le domaine d'Alboran n'est pas un fragment de la chaîne alpine mais une consé-quence d'une dynamique de retrait. Dans cette contribution nous tentons d'élucider les raisons historiques derriè...

show abstract

Structural and kinematic constraints to the exhumation of the Alpujarride Complex (Central Betic Cordillera, Spain)

Cited by 43 publications

References 68 publications

Subduction‐ and exhumation‐related structures in the Cycladic Blueschists: Insights from south Evia Island (Aegean region, Greece)

Subduction‐ and exhumation‐related structures in the Cycladic Blueschists: Insights from south Evia Island (Aegean region, Greece)

Deformation and exhumation of the Ronda peridotite (Spain)

The Alboran domain in the western Mediterranean evolution: the birth of a concept

Contact Info

Product

Resources

About