Results 151 to 160 of about 2,939 (195)

Eo-Hercynian Events in the Armorican Massif

1994
Eo-Hercynian events (i. e., significant deformation and metamorphism prior to strike-slip movements along transcurrent shear zones) are known only in the South-Armorican domain and in the Leon area (Fig.1).
M. Ballèvre, J. Marchand, G. Godard, J.-C. Goujou, Jean Christian, R. Wyns   +5 more
openaire   +1 more source

Cambrian of the Armorican Massif

1994
In the Armorican Massif, Cambrian rocks outcrop in the northeast (Normandy and Maine provinces) and to a lesser extent in the south (Vendee province). Brittany was mostly emerged and was only covered during the Arenig or pre-Arenig transgression. This partition roughly reflects the paleogeography (Fig.3).
openaire   +1 more source

The Cadomian orogeny in the North Armorican Massif: a brief review

Geological Society, London, Special Publications, 1990
The North Armorican Massif (NAM) of NW France is the type locality of the late Precambrian Cadomian orogenic belt. The NAM largely escaped reworking during the Upper Palaeozoic Variscan cycle, with the result that earlier geological relationships are commonly preserved intact. A large part of the Cadomian belt of the NAM comprises variably deformed and
R. S. D’Lemos, R. A. Strachan, C. G. Topley   +2 more
openaire   +1 more source

Short Paper: Cadomian terrane tectonics and magmatism in the Armorican Massif

Journal of the Geological Society, 1989
The North Armorican composite terrane, NW France, is a collage of displaced terranes which result from the amalgamation of Cadomian continental arcs and marginal basin complexes by sinistral transpression along a continental margin above a subduction zone. Early Cadomian arc activity occurred at c.
ROBIN A. STRACHAN, PETER J. TRELOAR, MICHAEL BROWN, RICHARD S. D’LEMOS   +3 more
openaire   +1 more source

Carboniferous of the Armorican Massif

1994
Following the Bretonian (post-Famennian II) oro-genic activity, sedimentary basins developed in response to dextral strike-slip faults (Villey 1978; Rolet 1984) in the Laval, Montmartin, Menez Belair, Morlaix, Châteaulin, Saint-Julien-de-Vouvantes and Ancenis areas (Fig. 18).
openaire   +1 more source

Permian of the Armorican Massif

1994
During the Permian most of the Armorican Massif was uplifted and block-faulted. The Permian rocks are located in a trough of the Cotentin Peninsula which is commonly known as the Carentan Basin (Fig. 22). Another prominent Permian-filled trough stretches eastward (Villequier Trough) beneath the Paris Basin succession.
openaire   +1 more source

Cadomian geodynamic evolution of the northeastern Armorican Massif (Normandy and Maine)

Geological Society, London, Special Publications, 1990
Abstract The oldest Precambrian rocks of the northeastern Armorican Massif are represented by the migmatites and gneisses of La Hague which make up the Lower Proterozoic Pentevrian basement. This is overlain by the low-grade Upper Proterozoic rocks of the Brioverian succession which were affected by Cadomian deformation and plutonism.
L. Dupret, E. Dissler, F Doré, F. Gresselin, J. Le Gall   +4 more
openaire   +1 more source

Study of a few palaeozoic ignimbrites in the armorican massif and in the central Massif, France

Bulletin Volcanologique, 1972
A detailed study of the petrographical characteristics of the acid palaeovolcanic formations in the Armorican Massif and in part of the Central Massif (France) reveals important ignimbritic provinces ranging from Precambrian to Carboniferous age. Close comparisons show that the ignimbrites, though varied in the details, form a whole which has constant ...
openaire   +2 more sources

The Brioverian (Upper Proterozoic) and the Cadomian orogeny in the Armorican Massif

Geological Society, London, Special Publications, 1990
Abstract The Brioverian in Brittany has generally been divided into the volcanogenic Lower Brioverian and the detrital Upper Brioverian, representing respectively the first and second episodes of the Cadomian orogeny, Cadomian I and Cadomian II.
D. Rabu, J. Chantraine, J. J. Chauvel, E. Denis, P. Balé, Ph. Bardy   +5 more
openaire   +1 more source

Palaeomagnetism and 40Ar/39Ar dating of the Trégor dolerites (Armorican Massif, France)

Tectonophysics, 1992
Abstract The Tregor doleritic dike swarm intrudes the Cadomian North Tregor Batholith (Armorican Massif, France). Alternating field (A.F.) and thermal demagnetization performed on 158 samples from 18 dolerite dikes and 37 samples from 4 baked contact sites reveal a multi-component magnetization and a complex magnetic mineralogy which was thoroughly ...
Gilles Ruffet, Hervé Perroud, Gilbert Féraud   +2 more
openaire   +1 more source