Les Montagnes Noires : cisaillement bordier méridional du bassin carbonifère de Châteaulin (Massif Armoricain, France). Caractéristiques structurales et métamorphiques

Darboux, Jean-René; Gall, Bernard Le

doi:10.1080/09853111.1988.11105161

Cited by 16 publications

(14 citation statements)

References 14 publications

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“…5) and is generally steep [33]. Around this shear zone, the regional foliation is sub-vertical and strikes N080°, parallel to the zone [32,33].…”

Section: Comparison With Structural Datamentioning

confidence: 96%

“…5) and is generally steep [33]. Around this shear zone, the regional foliation is sub-vertical and strikes N080°, parallel to the zone [32,33]. Based on structural data at various scales, Darboux and Le Gall [33] have argued that the MNSZ was a dextral transpressive shear zone.…”

Section: Comparison With Structural Datamentioning

confidence: 96%

“…Around this shear zone, the regional foliation is sub-vertical and strikes N080°, parallel to the zone [32,33]. Based on structural data at various scales, Darboux and Le Gall [33] have argued that the MNSZ was a dextral transpressive shear zone. Recently, Plusquellec et al [40] have documented northward thrusting along the western part of the MNSZ, where Brioverian metasediments are thrust over Palaeozoic sediments.…”

Section: Comparison With Structural Datamentioning

confidence: 98%

“…3 and 1) is marked by large surfaces of granitic rocks, whereas further East granites disappear progressively under the sedimentary series [23]. In addition, the area shows specific relatively high-grade metamorphic conditions [32,33] that can reach kyanite and staurolite stability fields [33,34]. These features suggest that this area shows a deeper erosion level than other parts of Central Brittany.…”

Section: Geologymentioning

confidence: 99%

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Tectonic history of the Hercynian Armorican Shear belt (Brittany, France)

et al. 2004

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The Hercynian Armorican belt is made of different tectonic domains separated by large-scale shear zones. One of these domains, Central Brittany, was deformed by regional pervasive dextral strike-slip during Carboniferous times. This paper examines implications that the restoration of ductile strain within Central Brittany has on the deformation history along its boundaries and within adjacent domains. Data used for the analysis include surface structural features and recent deep seismic data. A good consistency is observed between model implications and available geological and structural data. Results lead to a reappraisal of the Carboniferous history of the Armorican belt, including relationships between tectonics, plutonism and basin development. They further emphasize the usefulness of restoration for integrated tectonic analysis of crustal-scale deformation zones.

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“…5) and is generally steep [33]. Around this shear zone, the regional foliation is sub-vertical and strikes N080°, parallel to the zone [32,33].…”

Section: Comparison With Structural Datamentioning

confidence: 96%

Section: Comparison With Structural Datamentioning

confidence: 96%

Section: Comparison With Structural Datamentioning

confidence: 98%

Section: Geologymentioning

confidence: 99%

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Tectonic history of the Hercynian Armorican Shear belt (Brittany, France)

et al. 2004

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“…The overall dextral shear zone pattern is interpreted as a linked system dominated by the NASZ (north) and PNSZ (south), and their (duplex) overlapping domain. Inset shows the trace of the Monts d'Arrée (MASZ) and Montagnes Noires (MNSZ) dextral shear zones throughout the Central Armorican Domain (modified after Darboux and Le Gall, 1986). Abbreviations as in Figs.…”

Section: Dextral Shear Zone Patternmentioning

confidence: 99%

LiDAR offshore structural mapping and U/Pb zircon/monazite dating of Variscan strain in the Leon metamorphic domain, NW Brittany

et al. 2014

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International audienceAn exceptional structural picture of the immerged Variscan basement, offshore the Leon metamorphic domain, is supplied by high-resolution LiDAR and echosounder data recorded in the Molène archipelago, western Brittany (France). Various types of fabrics are identified and, from in situ rock sample analyses further combined with field structural data, are interpreted on a lineament trajectory map as the trace of magmatic and tectonic structures. Our onshore/offshore study leads us to propose a two-phase kinematic model that emphasizes the role of a strike-slip duplex in an EW-trending relay zone linking the North Armorican and Pierres Noires ductile shear zones (NASZ, PNSZ). Dextral shearing occurred within a transtensional setting, synchronously with magmatic intrusions (St-Renan granite and an offshore gabbro-diorite complex) dated at 314-320 Ma by new U-Th/Pb ages. It post-dated an early regional foliation related to top-to-the-NE ductile transpressional shearing. Our study emphasizes the key role of strike-slip tectonics in the NW part of the Armorica Variscan belt

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