Pressure–temperature–deformation–time of the ductile Alpine shearing in Corsica: From orogenic construction to collapse

Rossetti, Federico; Glodny, Johannes; Theye, Thomas; Maggi, Matteo

doi:10.1016/j.lithos.2015.01.011

Cited by 55 publications

(71 citation statements)

References 68 publications

(154 reference statements)

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“…The HP peak metamorphic conditions documented in the Schieste Lustrés ranged from blueschist to eclogite facies while the retrogressive metamorphism developed under blueschist and greenschist facies conditions (Gibbons et al ., ; Warburton, ; Waters, ; Fournier et al ., ; Caron, ; Daniel et al ., ; Vitale Brovarone et al ., ). According to the available data, the age of the HP‐LT metamorphism ranges from Late Cretaceous to Early Oligocene (Maluski, ; Lahondère and Guerrot, ; Brunet et al ., ; Martin et al ., ; Maggi et al ., ; Vitale Brovarone and Herwartz, , Rossetti et al ., ).…”

Section: Geological Frameworkmentioning

confidence: 97%

“…In this framework, a stack of continental units affected by high‐pressure (HP) metamorphism during the Early Tertiary has been recognized in the last thirty years in the western areas of Alpine Corsica (e.g. Gibbons and Horak, ; Daniel et al ., ; Tribuzio and Giacomini, ; Garfagnoli et al ., , Maggi et al ., ; Rossetti et al ., and references therein). These continental units were deformed when the European continental margin, still attached to the downgoing oceanic slab, was subjected to underthrusting, accretion and subsequent exhumation.…”

Section: Introductionmentioning

confidence: 99%

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Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

et al. 2016

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In the Corsica Island, a stack of metamorphic continental units derived from the European continental margin is thrust over a pre‐Alpine basement during the convergence‐related processes in the Late Eocene–Early Miocene time span. The Piedigriggio‐Prato Unit is representative of these units. Its tectono‐metamorphic history has been reconstructed by an integrated approach, ranging from map‐ to meso‐ and microscopic scale analyses. This unit is characterized by a polyphase deformation history that consists of three deformation phases developed under retrograde metamorphism ranging from blueschist to sub‐greenschist facies metamorphic conditions. At the map‐scale, the Piedigriggio‐Prato Unit is characterized by km‐size isoclinal folds deformed by open to closed recumbent folds producing Type 3 fold interference pattern. The features of the deformations and the P–T conditions suggest that the first two phases were acquired during the ductile extrusion of the Piedigriggio‐Prato Unit. Before the Early Miocene, the gravitational collapse of over‐thickened continental crust produced vertical shortening and the consequently recumbent F3 folds. The exhumation history of the Piedigriggio‐Prato Unit can be viewed as representative for the exhumation of a continental crust fragment during the transition from the continental subduction to the continental collision. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Geological Frameworkmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

et al. 2016

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“…As in the Western Alps, eclogitic units in Corsica experienced very fast exhumation since 35 Ma. They returned to the surface at rates as high as 30 km/Ma, at the same time the blueschist‐greenschist facies units of the Frontal wedge were already emplaced at shallow crustal levels [ Rossetti et al ., ] (Figure b).…”

Section: Upper Versus Lower Plate Control On Exhumation: the Corsica mentioning

confidence: 99%

“…Lower‐pressure rocks of Alpine Corsica are chiefly exposed in a doubly vergent frontal wedge closer to the European basement and, in places, overlay the HP rocks exposed on the Tyrrhenian side of the island [ Durand‐Delga , ; Molli , ]. Metamorphic grade increases from the west toward the east: the frontal part of the lower‐pressure accretionary wedge includes very low grade ophiolites and flysch units (Balagne Nappe) and minor slices of European continental crust [ Nardi et al ., ; Malasoma et al ., ], whereas the rear part includes greenschist‐to‐blueschist facies ophiolites and continental units (e.g., Pigno‐Morosaglia and Tenda units) [ Lahondère , ; Molli and Tribuzio , ; Rossetti et al ., ].…”

Section: Upper Versus Lower Plate Control On Exhumation: the Corsica mentioning

confidence: 99%

“…Unlike the Western Alps, no major late tectonic shortening affected the HP tectonic domes, but on the contrary detachment style extension overprinted the early Alpine nappe stacking [ Jolivet et al ., ; Daniel et al ., ], leading to the development of major east‐dipping shear zones (e.g., the Tenda shear zone in Figure b). The age of late extensional deformation, based on Rb‐Sr geochronology, is ∼20–21 Ma [ Rossetti et al ., ].…”

Section: Upper Versus Lower Plate Control On Exhumation: the Corsica mentioning

confidence: 99%

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Contrasting styles of (U)HP rock exhumation along the Cenozoic Adria‐Europe plate boundary (Western Alps, Calabria, Corsica)

Malusà

Faccenna

Baldwin

et al. 2015

Geochem Geophys Geosyst

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Since the first discovery of ultrahigh pressure (UHP) rocks 30 years ago in the Western Alps, the mechanisms for exhumation of (U)HP terranes worldwide are still debated. In the western Mediterranean, the presently accepted model of synconvergent exhumation (e.g., the channel-flow model) is in conflict with parts of the geologic record. We synthesize regional geologic data and present alternative exhumation mechanisms that consider the role of divergence within subduction zones. These mechanisms, i.e., (i) the motion of the upper plate away from the trench and (ii) the rollback of the lower plate, are discussed in detail with particular reference to the Cenozoic Adria-Europe plate boundary, and along three different transects (Western Alps, Calabria-Sardinia, and Corsica-Northern Apennines). In the Western Alps, (U)HP rocks were exhumed from the greatest depth at the rear of the accretionary wedge during motion of the upper plate away from the trench. Exhumation was extremely fast, and associated with very low geothermal gradients. In Calabria, HP rocks were exhumed from shallower depths and at lower rates during rollback of the Adriatic plate, with repeated exhumation pulses progressively younging toward the foreland. Both mechanisms were active to create boundary divergence along the Corsica-Northern Apennines transect, where European southeastward subduction was progressively replaced along strike by Adriatic northwestward subduction. The tectonic scenario depicted for the Western Alps trench during Eocene exhumation of (U)HP rocks correlates well with present-day eastern Papua New Guinea, which is presented as a modern analog of the Paleogene Adria-Europe plate boundary.

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The Cenozoic fold-and-thrust belt of Eastern Sardinia: Evidences from the integration of field data with numerically balanced geological cross section

et al. 2016

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Newly collected structural data in Eastern Sardinia (Italy) integrated with numerical techniques led to the reconstruction of a 2-D admissible and balanced model revealing the presence of a widespread Cenozoic fold-and-thrust belt. The model was achieved with the FORC software, obtaining a 3-D (2-D + time) numerical reconstruction of the continuous evolution of the structure through time. The Mesozoic carbonate units of Eastern Sardinia and their basement present a fold-and-thrust tectonic setting, with a westward direction of tectonic transport (referred to the present-day coordinates). The tectonic style of the upper levels is thin skinned, with flat sectors prevailing over ramps and younger-on-older thrusts. Three regional tectonic units are present, bounded by two regional thrusts. Strike-slip faults overprint the fold-and-thrust belt and developed during the Sardinia-Corsica Block rotation along the strike of the preexisting fault ramps, not affecting the numerical section balancing. This fold-and-thrust belt represents the southward prosecution of the Alpine Corsica collisional chain and the missing link between the Alpine Chain and the Calabria-Peloritani Block. Relative ages relate its evolution to the meso-Alpine event (Eocene-Oligocene times), prior to the opening of the Tyrrhenian Sea (Tortonian). Results fill a gap of information about the geodynamic evolution of the European margin in Central Mediterranean, between Corsica and the Calabria-Peloritani Block, and imply the presence of remnants of this double-verging belt, missing in the Southern Tyrrhenian basin, within the Southern Apennine chain. The used methodology proved effective for constraining balanced cross sections also for areas lacking exposures of the large-scale structures, as the case of Eastern Sardinia.

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Pressure–temperature–deformation–time of the ductile Alpine shearing in Corsica: From orogenic construction to collapse

Cited by 55 publications

References 68 publications

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

Syn‐convergence exhumation of continental crust: evidence from structural and metamorphic analysis of the Monte Cecu area, Alpine Corsica (Northern Corsica, France)

Contrasting styles of (U)HP rock exhumation along the Cenozoic Adria‐Europe plate boundary (Western Alps, Calabria, Corsica)

The Cenozoic fold-and-thrust belt of Eastern Sardinia: Evidences from the integration of field data with numerically balanced geological cross section

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