Results 181 to 190 of about 8,012 (220)
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Variscan tectonics in the Iberian Pyrite Belt, South Portuguese Zone
International Journal of Earth Sciences, 2002This paper aims to discuss the structural evolution of the Iberian Pyrite Belt during the Variscan Orogeny. It provides new structural data, maps and cross sections from the eastern part of the Iberian Pyrite Belt. Regional geology of the South Portuguese Zone and lithostratigraphy of the Iberian Pyrite Belt are first briefly summarised.
Soriano C., Casas J.
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Fluids in Hercynian Au veins from the French Variscan belt
Mineralogical Magazine, 1990AbstractFluids, together with alteration and ore mineral assemblages, were studied in representative hydrothermal gold-bearing quartz veins from the western part of the Variscan belt in France (La Bellière, Montagne Noire district, Villeranges-Le Châtelet district, and Limousin province).
M. C. Boiron +3 more
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The Scandinavian Caledonides and their relationship to the Variscan belt
Geological Society, London, Special Publications, 1997Abstract The main events that mark the contraction and extension histories of the Scandinavian Caledonides and the European Variscides are summarized. It is shown that continental subduction may have developed similarly large and asymmetric thrust systems in both orogens.
P. Rey, J.-P. Burg, M. Casey
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From thickening to extension in the Variscan belt — kinematic evidence from Sardinia (Italy)
Terra Nova, 1999The Variscan nappe stack of SE Sardinia originated as a result of several stages of nappe imbrication during the Lower Carboniferous phases of the Variscan orogeny. The crustal shortening caused regional SSW‐and W‐directed thrusting, greenschist facies metamorphism and open‐to‐isoclinal polyphase folding.
Conti, P. +4 more
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Tectonostratigraphic units in the Variscan belt of central Europe
1989The Variscan belt of Europe resulted from the collision of Africa with Baltica and intervening microplates. In early Paleozoic time, Baltica was probably separated from the areas farther south by a North-German/Polish ocean, whose trace is now under younger cover in the northern part of continental Europe.
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Paleomagnetic evidence for tectonic rotations in the Variscan Mountain Belt
Tectonics, 1986A critical review of Devonian and Carboniferous paleomagnetic results from the Hercynian basement of Western and Central Europe reveals large rotations. Their geographic distribution suggests a tectonic origin for large scale curved structures, such as the Ibero‐Armorican arc or the Variscan V, together with a coherence of the Hercynian domain with ...
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Eclogite relics in the Variscan orogenic belt of Bulgaria (SE Europe)
International Journal of Earth Sciences, 2008Eclogitic rocks were sampled from two zones in the basement of the Sredna Gora terrane (central western Bulgaria): (1) partially retrogressed eclogites and amphibolites embedded in sillimanite-bearing garnet-micaschists with kyanite relics and migmatites and (2) banded amphibolites associated with muscovite-bearing metagranites within two-mica ...
GAGGERO, LAURA +3 more
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Tectonometamorphic evolution of the Rehamna massif (Morocco, Variscan belt)
2015The Morocco Variscan belt is considered to be the south-western continuation of the European Carboniferous orogen on the NW Gondwana margin. The Rehamna Massif, a paleozoic massif located on the Meseta domain which is part of this belt, is affected by three main deformation events (D1, D2 and D3) of variable intensity and geometry, associated with a ...
Wernert, Pauline +8 more
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Geothermal Control of Granite Compositions in the Variscan Orogenic Belt
Nature Physical Science, 1973I HAVE shown that the average compositions of granites in the Variscan, Caledonian and Alpine orogenic belts differ, and have attributed their differences to formation by partial melting under different geothermal gradients1. A geochemical examination of the granites in the Caledonian orogenic belt suggested that regional variation within the orogenic ...
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Variscan metamorphism and K-Ar dates in the Variscan fold belt of S Brittany and NW Spain
Journal of the Geological Society, 1979The metamorphism in Lower Palaeozoic rocks in the Variscan fold belt of S Brittany and NW Spain is not evenly distributed but forms HT, LP thermal domes with migmatites and granites, separated by rocks with lower grades of metamorphism. 41 mica dates, ranging from 332 to 262 Ma, obtained from granites, decrease in age westwards along the fold belt ...
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