The Moldanubian Zone in the French Massif Central, Vosges/Schwarzwald and Bohemian Massif revisited: differences and similarities

Lardeaux, Jean‐Marc; Schulmann, Karel; Faure, Michel; Janoušek, Vojtěch; Lexa, Ondrej; Skrzypek, Etienne; Edel, Jean–Bernard; Štípská, Pavla

doi:10.1144/sp405.14

Cited by 98 publications

(112 citation statements)

References 227 publications

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“…Tournon area presents a complete cross-section through the classically described nappe pile and crosscutting magmatic rocks of the EMC (Lardeaux et al, 2014;Ledru et al, 1989). The area therefore represents a key locality for study of both the pre-and syn-Variscan history of the EMC.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The EMC is characterized by a south-verging Devonian to early Carboniferous stack of metamorphic nappes (Faure et al, 2009;Lardeaux et al, 2014;Ledru et al, 1989) that was dismantled by late Carboniferous strike-slip tectonics and magmatism associated with lateorogenic extension and collapse (Faure, 1995;Vanderhaeghe et al, 1999). The highest structural level within the nappe stack is represented by the Brévenne unit ( Fig.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The LAC is interpreted to represent remnants of thinned continental lithosphere with local oceanic affinities (ultra-basic rocks and tholeiitic metabasalts/metagabbros) (Briand et al, 1991;Gardien et al, 1990;Lardeaux et al, 2014;Pin, 1990;Pin and Paquette, 1997), the so-called Galicia-Massif Central oceanic domain(s).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…However, the continuity of the benthic faunas and paleomagnetic data preclude the existence of a large ocean between the Massif Central and Gondwana during the Ordovician and the Silurian (Cocks and Torsvik, 2002;Fortey and Cocks, 2003;Paris and Robardet, 1990;Shaw and Johnston, 2016;Tait et al, 2000). Accordingly, an Ocean-Continent transition (Lardeaux et al, 2014) or an hyperextended north Gondwana margin would represent more realistic settings for the Ordovician period.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The French Massif Central is one of the largest Variscan massifs and represents the exhumed internal zone of the orogen (e.g., Lardeaux et al, 2014; Fig. 1), thus offering insightful opportunities to study geologic processes that were at play in the Variscan orogenic core.…”

Section: Introductionmentioning

confidence: 99%

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Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

et al. 2017

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The East Massif Central (EMC), France, is part of the internal zone of the Variscan belt where late Carboniferous crustal melting and orogenic collapse have largely obliterated the pre-to early-Variscan geological record. Nevertheless, parts of this history can be reconstructed by using in-situ U-Th-Pb-Lu-Hf isotopic data of texturally well-defined zircon grains from different lithological units. All the main rock units commonly described in the EMC are present in the area of Tournon and include meta-sedimentary and meta-igneous rocks of the Upper Gneiss Unit (UGU) and of the Lower Gneiss Unit (LGU), as well as cross-cuttingVariscan granitoid dikes and a heterogeneous granite coring the major Velay dome. Herein we demonstrate that the UGU and the LGU have markedly distinct zircon records. The results of this study are consistent with deposition of the protoliths of the paragneisses within a backarc basin that was located adjacent to the Arabian-Nubian shield and/or the Saharan Metacraton during the late Ediacaran and collected detritus from the Gondwana continent. At ~545 Ma some of these sedimentary rocks were affected by a first melting event that formed the protoliths of the LGU orthogneisses, those of which subsequently remelted at ca. 308 Ma to form the Velay granite-migmatite dome. Protoliths of the UGU result mainly from a bimodal rift-related magmatism at ~480 Ma, corresponding to melting of the Ediacaran sediments and depleted mantle. Zircon rims from the UGU additionally provide evidence for a metamorphic/migmatitic overprint during the Lower Carboniferous (~350-340 Ma).Finally, several generations of granite dikes of which inherited zircons display characteristics of both the UGU and the LGU were protractedly emplaced from ~322 Ma to ~308 Ma, the youngest of which being coeval with the formation of the Velay dome. Our data further show that the vast majority of crustal material ultimately involved in the Variscan orogeny, which forms the present-day basement in the EMC, was derived from a sedimentary mixture of ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T various components from the Gondwana continent deposited in Ediacaran times, with no evidence for the involvement of an older autochthonous crust.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

et al. 2017

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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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Paleogeographical and Paleo‐Geodynamic Context of the Variscan Belt

Lardeaux

Schulmann

2023

The Variscan Belt of Western Europe 1

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The Moldanubian Zone in the French Massif Central, Vosges/Schwarzwald and Bohemian Massif revisited: differences and similarities

Cited by 98 publications

References 227 publications

Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

Pre-Cadomian to late-Variscan odyssey of the eastern Massif Central, France: Formation of the West European crust in a nutshell

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

Paleogeographical and Paleo‐Geodynamic Context of the Variscan Belt

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