Corsica and Sardinia in the Variscan Chain

Lardeaux, J. M.; Ménot, René-Pierre; Orsini, Jean-Baptiste; Rossi, Ph.; Naud, Gérard; Libourel, G.

doi:10.1007/978-3-642-84915-2_36

Cited by 12 publications

(13 citation statements)

References 19 publications

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“…The Western domain extends in Northern Sardinia where similar metamorphic rocks and migmatites have been described in the high-grade metamorphic complex (e.g. Lardeaux et al 1994;Franceschelli et al 2007;Giacomini et al 2008;Rossi et al 2009, Cruciani et al 2013, andreferences therein). This Western domain is also comparable with the Maures-Tanneron massif (e.g.…”

Section: Geodynamic Implicationsmentioning

confidence: 69%

“…The Alpine Corsica is a Paleogene high-pressure, low-temperature metamorphic nappe pile, consisting largely of Mesozoic ocean-derived sequences emplaced during the Alpine orogeny. The Crystalline Corsica, also known as the Variscan Corsica or Corsican batholith, consists of abundant syn-to late-orogenic granitoids, rare Variscan metamorphic septa, and pieces of pre-Variscan basement (e.g., Ménot and Orsini, 1990;Durand-Delga and Rossi, 1991;Lardeaux et al, 1994). Rossi, 1991;Rossi et al, , 2009Fig.…”

Section: Geological Background and Sample Descriptionsmentioning

confidence: 99%

See 1 more Smart Citation

From crustal anatexis to mantle melting in the Variscan orogen of Corsica (France): SIMS U–Pb zircon age constraints

Faure

Lin

2014

Tectonophysics

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Section: Geodynamic Implicationsmentioning

confidence: 69%

Section: Geological Background and Sample Descriptionsmentioning

confidence: 99%

From crustal anatexis to mantle melting in the Variscan orogen of Corsica (France): SIMS U–Pb zircon age constraints

Faure

Lin

2014

Tectonophysics

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“…These rocks are locally associated with coeval gabbroic rocks and sparse remnants of a high‐grade metamorphic basement (e.g. Lardeaux et al ., 1994). The western Corsica basement has also diffuse subvolcanic ring complexes, associated with dyke swarms showing bimodal compositions, which were ascribed to a later magmatic event with anorogenic alkaline affinity (Bonin, 1988).…”

Section: Geological Settingmentioning

confidence: 99%

Blueschist facies metamorphism of peralkaline rhyolites from the Tenda crystalline massif (northern Corsica): evidence for involvement in the Alpine subduction event?

Tribuzio¹,

Giacomini

2002

Journal Metamorphic Geology

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The Tenda crystalline massif (northern Corsica) is a fragment of the western Corsica basement involved in the Alpine orogeny. Rhyolite dykes crosscutting the gabbroic complex of Bocca di Tenda (southern sector of the Tenda crystalline massif) show an unusual metamorphic mineral assemblage, defined by jadeite‐bearing (up to 46 mol percentage) aegirine, riebeckite, celadonite‐rich phengite (Si=3.50–3.65 apfu), quartz, albite and K‐feldspar. Jadeite‐bearing aegirine and riebeckite mostly occur as coronas around jadeite‐free aegirine and arfvedsonite, respectively, which both are relics of igneous origin. This metamorphic assemblage reflects the peralkaline compositions, which are characterised by anomalously high contents of SiO2 and Na2O, and negligible CaO and MgO. The evolved rocks of the gabbroic sequence (quartz‐diorites to tonalites) and the surrounding granitoids are characterised by the development of riebeckite/ferroglaucophane, epidote, celadonite‐rich phengite and albite, thus pointing to a metamorphic crystallization in the epidote‐blueschist facies. In all the studied rocks, metamorphic reactions were controlled by fluid‐assisted mass‐transfer through grain boundaries and microfractures. The different mineral assemblages allow the peak P–T metamorphic conditions to be constrained to between 0.8 GPa/300 °C and 1.1 GPa/500 °C. These estimates attest to a geothermal gradient (dT/dP) of 10–13 °C km−1 and indicate that the Tenda crystalline massif was buried to a minimum depth of 27 km during the Alpine orogeny. The blueschist facies recrystallization in the Tenda crystalline massif has been related to the cessation of an eastward‐dipping subduction event.

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“…High‐pressure granulites crop out at Porto Vecchio, Fautea–Solenzara and Belgodere (Libourel, 1985; Palagi et al. , 1985; Libourel & Vielzeuf, 1988; Lardeaux et al. , 1990, 1994; Menot & Orsini, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…High-pressure granulites crop out at Porto Vecchio, Fautea-Solenzara and Belgodere (Libourel, 1985;Palagi et al, 1985;Libourel & Vielzeuf, 1988;Lardeaux et al, 1990Lardeaux et al, , 1994Menot & Orsini, 1990). Medium-pressure granulites crop out in Santa Lucia (central Corsica) and were not examined in this study, as they are considered to be equivalent to the crust in the Ivrea Zone of the Western Alps: their origin is attributed to mafic intrusions into middle to lower crustal paragneiss sequences during the Early Permian (Paquette et al, 2003;Rossi et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Exhumation of a Variscan orogenic complex: insights into the composite granulitic–amphibolitic metamorphic basement of south‐east Corsica (France)

Giacomini

Dallai

Carminati

et al. 2008

Journal Metamorphic Geology

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A structural, petrological and geochronological (U-Th-Pb of zircon and monazite) study reveals that the lower crust sequences of the Variscan high-grade basement cropping out between Solenzara and Porto Vecchio, south-east Corsica (France) have been tectonically juxtaposed along with middle crustal rocks during the extrusion of the orogenic root of the Variscan chain. We propose that a system of hightemperature, orogen-parallel shear zones that developed under a transpressive dextral tectonic regime caused the exhumation of the entire sequence. This tectonic complex is thus made up of rocks having undergone different P-T conditions (eclogite-?, high-pressure granulite facies and amphibolite facies) at different times, reflecting the progressive foreland migration of the orogenic front. The Solenzara granulites were derived from burial of continental crust to high-pressure (1.8-1.4 GPa) and high-to ultrahigh-temperature conditions (900-1000°C) during the Variscan convergence: U-Pb ELA-ICPMS zircon dating constrained the timing of this metamorphism at c. 360 Ma. The gneisses cropping out at Porto Vecchio are middle crustal-level rocks that reached their peak temperature conditions (700-750°C at <1.0 GPa) at c. 340 Ma. The diachronism of the metamorphic events, the foliation patterns and their geometry suggest that the granulites were exhumed to middle crustal levels through channel flow tectonics under continuous compression. The amphibolite facies gneisses of Porto Vecchio and the granulites of Solenzara were accreted through the development of a major dextral mylonitic zone forming under amphibolite facies conditions: in situ monazite isotope dating (ELA-ICPMS) revealed that this deformation occurred at c. 320 Ma and was accompanied by the emplacement of syntectonic high-K melts. A final HTLP static overprint, constrained at 312-308 Ma by monazite U-Th-Pb isotope dating, is related to the emplacement of the igneous products of the Sardinia-Corsica batholith and marks the transition from the Variscan orogenic event to the Permian extension.

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Corsica and Sardinia in the Variscan Chain

Cited by 12 publications

References 19 publications

From crustal anatexis to mantle melting in the Variscan orogen of Corsica (France): SIMS U–Pb zircon age constraints

From crustal anatexis to mantle melting in the Variscan orogen of Corsica (France): SIMS U–Pb zircon age constraints

Blueschist facies metamorphism of peralkaline rhyolites from the Tenda crystalline massif (northern Corsica): evidence for involvement in the Alpine subduction event?

Exhumation of a Variscan orogenic complex: insights into the composite granulitic–amphibolitic metamorphic basement of south‐east Corsica (France)

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