Results 11 to 20 of about 6,109 (226)

Variscan orogeny in Corsica: new structural and geochronological insights, and its place in the Variscan geodynamic framework [PDF]

International Journal of Earth Sciences, 2014
International audienceIn Western Corsica, remnants of pre-batholitic lithological and metamorphic assemblages are preserved as km-scale septa enclosed within Lower Carboniferous to Early Permian plutons.
Faure, Michel, Frei, Dirk, Gaché, Julien, Li, Xian-Hua, Lin, Wei, Melleton, Jérémie, Rossi, Philippe   +6 more
core   +8 more sources

How many subductions in the Variscan orogeny? Insights from numerical models [PDF]

Geoscience Frontiers, 2020
<p>The Variscan belt is the result of the Pangea accretion, a prominent feature of the European continental lithosphere (von Raumer et al., 2003) . The debate on the number of oceans and the geodynamic evolution of the Variscan belt is still open (Faure et al., 2009; Franke et al., 2017). Two scenarios have been proposed:</
Regorda, Alessandro, Lardeaux, Jean-Marc, Roda, Manuel, Marotta, Anna Maria, Spalla, Maria Iole   +4 more
openaire   +4 more sources

Two plates — Many subduction zones: The Variscan orogeny reconsidered

Gondwana Research, 2013
Abstract The Variscides of Europe and N-Africa are the result of the convergence of the plates of Gondwana and Laurussia in the Paleozoic. This orogen is characterized by the juxtaposition of blocks of continental crust that are little affected by the Variscan orogeny.
Kroner, U., Romer, R.
openaire   +8 more sources

The Addition of Felsic Sediments to the Lower Continental Crust During the Variscan Orogeny

Geochemistry, Geophysics, Geosystems
Lower crustal metasedimentary xenoliths (garnet‐sillimanite granulites) from the Bournac breccia pipe in the Massif Central, France, provide a robust example of sediments transported to depth and incorporated into stable lower continental crust during a ...
M. F. Ringwood, S. E. Ortner, R. L. Rudnick   +2 more
doaj   +2 more sources

Extensional perpendicular orthogonal quartz veins related to early Variscan Orogeny

Journal of Structural Geology
Orthogonal sets of veins perpendicular to the bedding occur in fold-and-thrust belts; however, the timing of their formation remains unclear in relation to orogeny. This study aims to explain the development of perpendicular orthogonal vein sets from the iconic outcrops at northern Almograve in southwestern Portugal also known as “Chocolate-Tablet ...
Akbar Aydin Oglu Huseynov, Bernd Andeweg, H.J.L. van der Lubbe   +2 more
openaire   +3 more sources

How Stiff Was Armorica During the Variscan Orogeny? A Reappraisal of the “Bretonian” Phase in Central Brittany

Geosciences
In collision belts, the upper plate is generally less deformed than the lower one that underwent syn-metamorphic ductile shearing, and frequently late-collisional crustal melting.
Michel Faure, Eric Marcoux, Marc Poujol, Clément Masson   +3 more
doaj   +3 more sources

Remelting of Ordovician migmatites and granites during Variscan high-grade metamorphism (Aar Massif, Central Alps, Switzerland) [PDF]

Swiss Journal of Geosciences
The remelting of felsic gneisses, migmatites and granite during a later orogenic cycle can produce rocks of different age with comparable field appearance, microstructure, mineralogical and chemical composition.
Urs Schaltegger, Alfons Berger, Jürgen Abrecht, Alexey Ulianov, Eliana Noroña Muñoz, Daniela Rubatto, Maria Ovtcharova, Agathe Martignier, Richard Spikings, Michael Wiederkehr   +9 more
doaj   +3 more sources

Post-depositional tectonic modifications of VMS deposits in Iberia and its economic significance [PDF]

, 2011
The original stratigraphic relationships and structure of VMS deposits are commonly obscured by deformation. This can also affect their economic significance, as shown by several Iberian Pyrite Belt (IPB, SW Iberia) examples.
Castroviejo Bolibar, Ricardo, Quesada, Cecilio, Soler, Miguel   +2 more
core   +2 more sources

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics [PDF]

, 2006
Anorogenic intra-plate magmatism was widespread in Europe from early Tertiary to Recent times, extending west to east from Spain to Bulgaria, and south to north from Sicily to northern Germany. Magmatism is spatially and temporally associated with Alpine-
Downes, Hilary, Wilson, M.
core   +1 more source

Rifting and arc-related early Paleozoic volcanism along the North Gondwana margin: geochemical and geological evidence from Sardinia (Italy) [PDF]

, 2012
Three series of volcanic rocks accumulated during the Cambrian to Silurian in the metasediment-dominated Variscan basement of Sardinia. They provide a record of the changing geodynamic setting of the North Gondwana margin between Upper Cambrian and ...
BUZZI L, FUNEDDA A., GAGGERO L, OGGIANO G   +3 more
core   +1 more source