Results 151 to 160 of about 953 (179)
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Cadomian geodynamic evolution of the northeastern Armorican Massif (Normandy and Maine)
Geological Society, London, Special Publications, 1990Abstract 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 +4 more
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Permian of the Armorican Massif
1994During 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.
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Short Paper: Cadomian terrane tectonics and magmatism in the Armorican Massif
Journal of the Geological Society, 1989The 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 +3 more
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Journal of Sedimentary Research, 1998
ABSTRACT The Lower Ordovician ironstones of the Iberian Massif (Zamora) and of the Armorican Massif (central Brittany) occur in units of varying thickness (0.2-2.5 m). They are interstratified in mainly sandy formations, with numerous sedimentary structures and trace fossils showing that they were deposited in a nearshore environment (intertidal or ...
Fernandez, A. +2 more
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ABSTRACT The Lower Ordovician ironstones of the Iberian Massif (Zamora) and of the Armorican Massif (central Brittany) occur in units of varying thickness (0.2-2.5 m). They are interstratified in mainly sandy formations, with numerous sedimentary structures and trace fossils showing that they were deposited in a nearshore environment (intertidal or ...
Fernandez, A. +2 more
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Palaeomagnetism and 40Ar/39Ar dating of the Trégor dolerites (Armorican Massif, France)
Tectonophysics, 1992Abstract 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 +2 more
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Palygorskite in The Tertiary Deposits of The Armorican Massif
1984Abstract In the Armorican Massif, palygorskite has been found in Eocene and Oligo-cene deposits, in marine, transitional marine and lacustrine depositional environments. The palygorskite occurs in layers containing either exclusively clays or carbonates (dolomite, or calcite).
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The Origin of Clay Minerals in Cenomanian Littoral Deposits Around the Armorican Massif.
1979Abstract The study of Cretaceous deposits around the Armorican Massif shows that the mineralogical composition of the detrital material entering the area during the Cenomanian was almost constant. However, the distribution of the clay mineral fraction in the sediments appears to be related to two facies: 1° a continental nearshore facies with ...
J. Louail +2 more
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Any news from the Icartian in the Armorican Massif in Brittany?
2018The Neoproterozoic terranes throughout the circum-Atlantic (Carolina, Cadomia and Avalon) are considered as the remnants of subduction related magmatic arcs and associated basins developed off the margins of Gondwana. As they are found in very distant regions, establishing correlations between the tectonothermal evolutions for these terranes remains a ...
Poujol, Marc +3 more
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Contrasted Occurrence of Eodevonian Stromatolites, Northeastern Armorican Massif, France
1981While revising the Devonian System of the N.E. Armorican Massif, France (Fig. 1) stromatolitic units were first reported by the author (Poncet 1964) in Eodevonian strata (Formation of the Schistes et Calcaires de Nehou, Middle Siegenian in age). Three main types of stromatolites were recognized and will be described here.
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