Middle Carboniferous crustal melting in the Variscan Belt: New insights from U–Th–Pbtot. monazite and U–Pb zircon ages of the Montagne Noire Axial Zone (southern French Massif Central)

Faure, Michel; Cocherie, Alain; Mézème, Eugène Bé; Charles, Nicolas; Rossi, P.

doi:10.1016/j.gr.2010.02.005

Cited by 65 publications

(61 citation statements)

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“…Such a simple and fast technique has been successfully applied to several plutonic or metamorphic rocks (e.g., Suzuki and Adachi 1991;Montel et al 1996;Cocherie et al 1998Cocherie et al , 2005Cocherie and Albarède 2001;Schulz 2009;Faure et al 2010, and enclosed references). Monazite is a common accessory mineral in metamorphic rocks, especially in metapelites.…”

Section: Monazite Epma Chemical Dating Analytical Methods and Strategymentioning

confidence: 99%

“…X-ray element maps were also recorded with an accelerating voltage of 20 kV and beam current of 100 nA, using the wavelengthdispersive spectrometers. Details on the analytical procedure are the same as those used in Cocherie et al (2005) and Faure et al (2008Faure et al ( , 2010. Age calculations were done using the Isoplot/Ex (2.49) program of Ludwig (2001) and a Microsoft Excel add-in program for determining U-Th-Pb ages from EPMA measurements (Pommier et al 2002).…”

Section: Monazite Epma Chemical Dating Analytical Methods and Strategymentioning

confidence: 99%

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Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic, metamorphic, and thermal events in the inner part of the Variscan orogen, example from the Sioule series, French Massif Central

Couto

Faure

Augier

et al. 2015

Int J Earth Sci (Geol Rundsch)

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International audienceIn the northern Variscan French Massif Central, the Sioule metamorphic series exposes from top to bottom the tectonic superposition of the Upper Gneiss Unit (UGU), Lower Gneiss Unit (LGU), and Para-autochthonous Unit (PAU). The nappe stacking developed throughout two prograde syn-metamorphic events: D1 is a top-to-the-SW shearing coeval with a probable Devonian migmatization and D2 is a top-to-the-NW shearing event. Both events were completed before the unconformable deposition of the undeformed and unmetamorphosed “Tufs anthracifères” formation, dated at ca 330 Ma (Late Visean). Furthermore, the UGU experienced a high-pressure metamorphism ascribed to a D0 event during which eclogite or granulite crystallized in several parts of the UGU. Monazite U–Th–Pb and zircon U–Pb SIMS datings were carried out in order to constrain the ages of these D0, D1, and D2 tectono-metamorphic events. These new geochronological results are placed in a P–T-t diagram constructed for the UGU, LGU, and PAU. Monazite sampled in UGU, LGU, and PAU rocks yields similar 365–350 Ma ages consistent with the D2 event dated in other places of the French Massif Central. A zoned monazite grain from a granulitic paragneiss yields 416 ± 15 and 362 ± 14 Ma ages interpreted as those of the D0 and D2 events, respectively. Zircon from the same granulitic paragneiss yields SIMS ages at 343 ± 2 and 328 ± 2 Ma that are interpreted as recrystallization processes associated with post-thickening thermal events, possibly recording the onset of orogenic collapse of the Northern Massif Central. It is worth to note that neither monazite nor zircon recorded the D1 event

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Section: Monazite Epma Chemical Dating Analytical Methods and Strategymentioning

confidence: 99%

Section: Monazite Epma Chemical Dating Analytical Methods and Strategymentioning

confidence: 99%

Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic, metamorphic, and thermal events in the inner part of the Variscan orogen, example from the Sioule series, French Massif Central

Couto

Faure

Augier

et al. 2015

Int J Earth Sci (Geol Rundsch)

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“…However, it is more interesting here to mention three outcrops of rather small extension, but that are interesting pieces of great significance though still poorly connected (at least two of them) into the geological jigsaw puzzle of the Black Mountains as part of the patchwork of the Variscan belt (Faure et al , 2010.…”

Section: At the Scale Of A Single Outcrop: The Geotopementioning

confidence: 99%

“…However, the Ordovician age (Roger et al 2004;Cocherie et al 2005) of orthogneiss of the Axial Zone has since invalidated the hypothesis of several »Precambrian orthogneissic cores« involved in thrust nappes of Penninic style (Laumonier et al 2004;Charles et al 2009;Roger et al 2015). Consequently, recent works (e.g., Faure et al 2009Faure et al , 2010 prefer to go back to former structural maps such as those published by François Arthaud (1970) or even by Bernard Gèze (1949).…”

Section: The Black Mountains: »There and Back Again«mentioning

confidence: 99%

“…Monts de Faugères) para-autochthonous area (Faure et al 2010). This very complex unit, first described and mapped by Jules Bergeron (1899) and Bernard Gèze (1949), exhibits large-scale olistoliths of Carboniferous and Devonian limestones, Silurian volcanites and Ordovician turbidites, forming a wildflysch sequence deposited during the Visean and Early Namurian stages at the front of the advancing nappes of the Southern Side (Engel et al 1978(Engel et al , 1980Feist and Galtier 1984).…”

Section: A Heterogeneous Geofacies: the Roque Redonde Olistolithmentioning

confidence: 99%

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Aspects of geodiversity of Palaeozoic limestones in the Black Mountains of southern France

Giusti

2016

AGS

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Strain partitioning along the anatectic front in the Variscan Montagne Noire massif (southern French Massif Central)

et al. 2015

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We decipher late-orogenic crustal flow characterized by feedback relations between partial melting and deformation in the Variscan Montagne Noire gneiss dome. The dome shape and finite strain pattern of the Montagne Noire Axial Zone (MNAZ) result from the superimposition of three deformations (D1, D2 and D3). The early flat-lying S1 foliation is folded by D2 upright ENE-WSW folds and transposed in the central and southern part of the MNAZ into steep D2 high-strain zones consistent with D2 NW-SE horizontal shortening, in bulk contractional coaxial deformation regime that progressively evolved to noncoaxial dextral transpression. The D2 event occurred under metamorphic conditions that culminated at 0.65 ± 0.05 GPa and 720 ± 20°C. Along the anatectic front S1 and S2 foliations are transposed into a flat-lying S3 foliation with top-to-NE and top-to-SW shearing in the NE and SW dome terminations, respectively. These structures define a D3 transition zone related to vertical shortening during coaxial thinning with a preferential NE-SW to E-W directed stretching. Depending on structural level, the metamorphic conditions associated with D3 deformation range from partial melting conditions in the dome core to subsolidus conditions above the D3 transition zone. We suggest that D2 and D3 deformation events were active at the same time and resulted from strain partitioning on both sides of the anatectic front that may correspond to a major rheological boundary within the crust.

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Middle Carboniferous crustal melting in the Variscan Belt: New insights from U–Th–Pbtot. monazite and U–Pb zircon ages of the Montagne Noire Axial Zone (southern French Massif Central)

Cited by 65 publications

References 75 publications

Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic, metamorphic, and thermal events in the inner part of the Variscan orogen, example from the Sioule series, French Massif Central

Monazite U–Th–Pb EPMA and zircon U–Pb SIMS chronological constraints on the tectonic, metamorphic, and thermal events in the inner part of the Variscan orogen, example from the Sioule series, French Massif Central

Aspects of geodiversity of Palaeozoic limestones in the Black Mountains of southern France

Strain partitioning along the anatectic front in the Variscan Montagne Noire massif (southern French Massif Central)

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