Results 51 to 60 of about 4,105 (193)

The South Millevaches Middle Carboniferous crustal melting and its place in the French Variscan Belt [PDF]

, 2009
International audienceSeveral episodes of crustal melting are now well identified in the Variscan French Massif Central. Middle Devonian (ca 385-375 Ma) migmatites are recognized in the Upper and Lower Gneiss Units involved in the stack of nappes.
Be Mezeme, Eugène, Cocherie, Alain, Faure, Michel, Melleton, Jérémie, Rossi, Philippe   +4 more
core   +3 more sources

Crustal Structure of Laurentia and Peri‐Gondwanan Terranes Beneath Ireland and Britain and Comparison With Eastern North America

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract The Appalachian‐Caledonian orogen was built during the Paleozoic by accretion of peri‐Gondwanan terranes onto Laurentia, culminating in the formation of Pangea. During the Mesozoic, Pangea broke apart, displacing one section of the belt to eastern North America and another to northwestern Europe.
Roberto Masis, Paul Karabinos, Maureen D. Long, John W. F. Waldron, James Bourke   +4 more
wiley   +1 more source

Late Ediacaran juvenile magmatism in the Variscan Monts-du-Lyonnais metamorphic complex (Massif Central, France)

BSGF - Earth Sciences Bulletin
The identification of oceanic sutures is key to understanding the evolution of the Paleozoic Variscan belt and the structure of the West European lithosphere.
Couzinié Simon, Laurent Oscar, Bouilhol Pierre, Chelle-Michou Cyril, Ganzhorn Anne-Céline, Gardien Véronique, Moyen Jean-François   +6 more
doaj   +1 more source

Cambrian magmatism, Variscan high-grade metamorphism and imposed greenschist facies shearing in the Central Sredna Gora basement units (Bulgaria)

Geologica Carpathica, 2015
Gneisses from the deep structural levels of the European Variscan Belt are well exposed in the Central Sredna Gora in Bulgaria. In general, migmatites predominate, but unmigmatized domains (or domains with incipient migmatization) are also documented in ...
Lazarova Anna, Naydenov Kalin, Petrov Nikolai, Grozdev Valentin   +3 more
doaj   +1 more source

Zircon and titanite geochronology of the Furstenstein granite massif, Bavarian Forest, NW Bohemian Massif: Pulses of the late Variscan magmatic activity

European Journal of Mineralogy, 2004
The Furstenstein granite massif is the largest late Variscan granitoid body exposed in the Moldanubian basement of the Bavarian Forest. The granite massif comprises different rock types, ranging from diorite to granite in composition. This study provides precise zircon and titanite ages, obtained by the U-Pb isotopic dilution and Pb-Pb evaporation ...
Fukun Chen, Wolfgang Siebel
openaire   +1 more source

New U-Pb SHRIMP zircon ages for pre-variscan orthogneisses from Portugal and their bearing on the evolution of the Ossa-morena tectonic zone [PDF]

, 2006
New SHRIMP U-Pb zircon ages for the Portalegre and Alcáçovas orthogneisses document a complex pre-Variscan history for the Iberian basement in Portugal. The available geochemical and geochronological data for the Alcáçovas orthogneiss (ca.
Andrade, A. S., Azevedo, M. do Rosário, Cordani, U. G., Mendes, M. H., Nutman, A. P., Pinto, M. S., Santos, J. F.   +6 more
core   +3 more sources

Rapid Transition From High‐Pressure Metamorphism to Exhumation Driven by Orogen‐Parallel Extensional Shearing (Adula Unit, Eastern Central Alps)

Tectonics, Volume 45, Issue 2, February 2026.
Abstract In the Central Alps, the Adula unit exposes high‐ and ultra‐high‐pressure (HP‐UHP) metamorphic rocks, providing key insights into the subduction and exhumation dynamics of the former distal European margin. We investigate the San Bernardino Shear Zone (SBSZ), a top‐to‐the‐east extensional shear zone developed within orthogneiss and paragneiss ...
C. Montemagni, R. Monti, N. Malaspina, P. Vannucchi, S. Zanchetta   +4 more
wiley   +1 more source

Late- to post-Variscan extensional tectonics in south Cornwall [PDF]

, 2013
Faults which post-date Variscan contractional deformation are ubiquitous in south Cornwall. Three broad geometric/kinematic types can be defined. The first type comprises low angle (dip 45°) extensional faults which generally offset earlier low-angle ...
Shail, RK, Wilkinson, J.J.
core  

Magmatic and Tectonic Structures in the Crust Beneath Armenia and Surrounding Regions of Lesser Caucasus Inferred From Body‐Wave Earthquake Tomography

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 1, January 2026.
Abstract The Armenian Highlands, a tectonically active segment of the Arabia‐Eurasia collision zone, exhibit widespread Quaternary volcanism, rapid uplift, and intense seismicity. However, the lithospheric processes driving these phenomena remain poorly understood.
Ivan Koulakov, Lilit Sargsyan, Ara Levonyan, Elya Sahakyan, Mikayel Gevorgyan, Khachatur Meliksetian   +5 more
wiley   +1 more source

Peralkaline and alkaline magmatism of the Ossa-Morena Zone (SW Iberia): age, source and implications for the Paleozoic evolution of Gondwanan lithosphere [PDF]

, 2014
The Ossa-Morena zone in SW Iberia represents a section of the northern margin of West Gondwana that formed part of a Cordilleran-type orogenic system during the Neoproterozoic (Cadomian orogeny).
Diez-Fernandez, Ruben, Foster, David, Pereira, M. Francisco   +2 more
core   +2 more sources