Intracontinental Hercynian Events in the Armorican Massif

Rolet, J.; Gresselin, F.; Jegouzo, P.; Ledru, Patrick; Wyns, Robert

doi:10.1007/978-3-642-84915-2_20

Cited by 27 publications

(28 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As observed in the Le Conquet area, the wrenching overprints the top-to-the-N shearing. In agreement with previous conclusions (e.g., Goré and Le Corre 1987;Le Corre et al 1989;Rolet et al 1994), the age of the dextral shearing can be inferred from that of the synkinematic St-Renan pluton. Our monazite U-Th/Pb dating indicates that the NASZ was active at about 320 Ma (Fig.…”

Section: Discussion Of the Geochronological Datasupporting

confidence: 92%

“…Although never observed in the field, but in agreement with previous works (Rolet et al 1994;Chauris et al 1998), a tectonic contact between the Penzé micaschists and the overlying Neoproterozoic Cadomian micaschists is assumed (Figs. 7, 8).…”

Section: Penzé Areasupporting

confidence: 89%

“…The main event observed in all units is the top-to-the-NW synmetamorphic shearing developed under amphibolite facies conditions. In the Para-Autochthonous Unit, the Penzé-Le Conquet Intermediate Nappe, and the Paleozoic series of the Upper Nappe, this synmetamorphic deformation is the earliest one recorded there, and responsible for the stacking of nappes Brun 1986, Le Corre et al 1989;Rolet et al 1994;Faure et al 2005). 3.…”

Section: Geological Setting: the Léon Domain In The Massif Armoricainmentioning

confidence: 99%

“…This composite massif can be subdivided into several paleogeographic or tectonic domains (e.g., Cogné 1974;Le Corre et al 1991;Rolet et al 1994). Its structure is dominated by E-W trending dextral shear zones (Fig.…”

Section: Geological Setting: the Léon Domain In The Massif Armoricainmentioning

confidence: 99%

“…1) is the smallest one of the Massif Armoricain. In spite of numerous Carboniferous plutons that partly hide the structural relationships between the units, an antiformal stack of nappes is presently recognized (Le Corre et al 1989;Rolet et al 1994;Faure et al 2005;Fig. 2).…”

Section: Geological Setting: the Léon Domain In The Massif Armoricainmentioning

confidence: 99%

See 4 more Smart Citations

The Léon Domain (French Massif Armoricain): a westward extension of the Mid-German Crystalline Rise? Structural and geochronological insights

Faure

Sommers

Melleton

et al. 2008

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

The Léon Domain in the NW part of the French Massif Armoricain is a stack of synmetamorphic nappes displaced from south to north in ductile conditions. From bottom to top, an orthogneissic basement is overthrusted successively by (1) a Lower Nappe of gneiss including mafic eclogites, (2) an Intermediate Nappe of biotite-garnet-staurolite micaschists with mafic blocks, and (3) an upper nappe made up of Neoproterozoic phyllites covered by unmetamorphosed Paleozoic sedimentary series. This microstructural study documents a polyphase evolution with firstly a top-to-the-N shearing, secondly followed by upright folding of the stack of nappes coeval with migmatization, and lastly, a dextral wrenching along the North Armorican Shear Zone associated with emplacement of synkinematic plutons. New UTh/Pb chemical dating of monazites from biotite-garnet-staurolite micaschists, migmatites, and granitoids argue for 340-335 Ma, 335-327 Ma, and about 320 Ma ages for synthrusting metamorphism, anatexis, and wrenching, respectively. A metagabbro from Le Conquet yields a zircon LA-ICP-MS age of 478 ± 4 Ma, which corresponds to magma emplacement time. The Léon Domain is interpreted as a microcontinent separated from Armorica by the Le Conquet-Penzé suture to the south and east, and from Laurussia by the Rheic suture to the north. A possible correlation with the Mid-German Crystalline Rise of Central Europe is discussed.

show abstract

Section: Discussion Of the Geochronological Datasupporting

confidence: 92%

Section: Penzé Areasupporting

confidence: 89%

Section: Geological Setting: the Léon Domain In The Massif Armoricainmentioning

confidence: 99%

Section: Geological Setting: the Léon Domain In The Massif Armoricainmentioning

confidence: 99%

Section: Geological Setting: the Léon Domain In The Massif Armoricainmentioning

confidence: 99%

See 3 more Smart Citations

The Léon Domain (French Massif Armoricain): a westward extension of the Mid-German Crystalline Rise? Structural and geochronological insights

Faure

Sommers

Melleton

et al. 2008

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

show abstract

Early Metamorphisms and Deformations in the French Variscan Belt

Faure

2023

The Variscan Belt of Western Europe 1

View full text Add to dashboard Cite

The Variscan Belt of Western Europe 2

2023

View full text Add to dashboard Cite

The Variscan Belt of Western Europe 1 4.2.1. Eo-Variscan events 4.2.1.1. HP and UHP metamorphism (D0) Known since the end of the 19th century by the works of Lacroix and his students (Brière 1920, see Godard 2001 for more details), high-pressure (HP) rocks are mainly found in the klippes forming the UGU of the French Massif Central.deformation D 2 (see Chapter 1 of Volume 2. However, it is important to note that in the south of the FMC, the D 3 deformation of the para-autochthonous units and the Fold-and-Thrust Belt is synchronous with the deposition of the "Tufs anthracifères" formation.

show abstract

Intracontinental Hercynian Events in the Armorican Massif

Cited by 27 publications

References 24 publications

The Léon Domain (French Massif Armoricain): a westward extension of the Mid-German Crystalline Rise? Structural and geochronological insights

The Léon Domain (French Massif Armoricain): a westward extension of the Mid-German Crystalline Rise? Structural and geochronological insights

Early Metamorphisms and Deformations in the French Variscan Belt

The Variscan Belt of Western Europe 2

Contact Info

Product

Resources

About