Results 21 to 30 of about 273 (174)

Geology of the contact area between the Internal and External Nappe Zone of the Sardinian Variscan Belt (Italy): new insights on the complex polyphase deformation occurring in the hinterland-foreland transition zone of collisional belts

Journal of Maps, 2022
This study aims to decipher the structural evolution of a sector of the Nappe Zone in the Sardinian Variscan Belt. We investigated the Barbagia Thrust between the Meana Sardo Unit (belonging to the External Nappe Zone) in the footwall and the Barbagia ...
A. Petroccia, C. Montomoli, S. Iaccarino, R. Carosi   +3 more
doaj   +1 more source

The Volcanic History of the UNESCO Global Geopark Bohemian Paradise [PDF]

Geoconservation Research, 2023
Central Europe and the area of the UNESCO Global Geopark Bohemian Paradise have been affected by global tectonic events, especially during the last 500 million years. Volcanic phenomena are the most striking traces today of such past tectonic events.
Vaclav Mencl, Jan Bubal, Marcela Starkova   +2 more
doaj   +1 more source

Geology of the Montigiu Nieddu metamorphic basement, NE Sardinia (Italy)

Journal of Maps, 2020
A geological map at 1:10,000 scale is presented that shows the distribution of the metamorphic rock units in the area of Montigiu (Mt.) Nieddu (NE Sardinia). These units belong to the High-Grade Metamorphic Complex in the Inner Zone of the Variscan chain
Gabriele Cruciani, Marcello Franceschelli, Giovanni Musumeci, Massimo Scodina   +3 more
doaj   +1 more source

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

FORAMINIFERAL EVIDENCE FOR THE AGE OF EXOTIC BLOCKS WITHIN THE KOPRÍA MÉLANGE, RHODOS (GREECE)

Rivista Italiana di Paleontologia e Stratigrafia, 2005
Blocks embedded within the Kopría Mélange of western Rhodos yield well-preserved, abundant microfossils including early Middle Pennsylvanian fusulinacean faunas represented by species belonging to the genera Eoschubertella, Profusulinella ...
EDUARDO GARZANTI, JOHN R. GROVES, ROBERTO RETTORI   +2 more
doaj   +1 more source

The role of variscan shortening in the control of mineralization deposition in Tadaout-Tizi N’rsas mining district (Eastern Anti-Atlas, Morocco)

Bulletin of the Mineral Research and Exploration, 2020
The abundance of the NE-SW direction veins mineralized in barite, copper, lead and zinc in the Tadaout-Tizi n’Rsas (TTR) anticline make this area one of the principal vein fields in Tafilalet (easternmost border of the Eastern Anti-Atlas).
Mustapha AIT DAOUD, Abdelhafid ESSALHI, Mourad ESSALHI, Abdeslam TOUMMITE   +3 more
doaj   +1 more source

A few remarks on the Triassic paleogeography and geodynamic link between the Dinarides an the Serbo-Macedonian unit [PDF]

Geološki Anali Balkanskoga Poluostrva, 2020
A recently recycled tectonic hypothesis in which the Serbo-Macedonian Unit rifted off during Ladinian from the Dinarides is tested. The Triassic rifting, according to this concept, led to the opening and the formation of a northwestern branch of ...
Spahić Darko, Gaudenyi Tivadar
doaj   +1 more source

Petrogenetic constraints on the felsic vein magmatism in northern Portugal based on petrological and geochemical data

Comptes Rendus. Géoscience, 2021
Three of the largest granite porphyries of northern Portugal were studied to improve current knowledge on the regional felsic vein hypabyssal magmatism.
Oliveira, António João Teixeira, Martins, Helena Cristina Brites, da Silva, Helena Maria Sant’Ovaia Mendes   +2 more
doaj   +1 more source

⁴⁰Ar ∕ ³⁹Ar age constraints on the formation of fluid-rich quartz veins from the NW Rhenohercynian zone (Rursee area, Germany) [PDF]

Geochronology
A substantial part of the subsurface geology in northwestern and central Europe is defined by the late Palaeozoic Variscan Orogeny (∼ 350 Ma). Our focus is mainly on veining in anchimetamorphic sedimentary rocks affected by this orogeny.
A. A. O. Huseynov, J. Wijbrans, K. Kuiper, J. van der Lubbe   +3 more
doaj   +1 more source

Molybdenite Re-Os dating of Mo-Th-Nb-REE rich marbles: pre-Variscan processes in Moldanubian Variegated Group (Czech Republic)

Geologica Carpathica, 2015
In an effort to contribute to the discussion concerning the age of rocks of the Moldanubian Variegated Group, we have undertaken Re-Os dating of molybdenite of banded carbonatite-like marbles (CLM) from the graphite mine Václav at Bližná (Southern ...
Drábek Milan, Stein Holly
doaj   +1 more source