Results 1 to 10 of about 823 (158)

Magnetic mineralogy of Variscan granites from northern Portugal: an approach to their petrogenesis and metallogenic potential [PDF]

Geologica Acta, 2020
Northern Portugal is characterized by the occurrence of numerous W hydrothermal deposits spatially associated with granites. The primary goal of this work is to establish a relationship between the magnetic behavior of the granites and the redox ...
C. Cruz, H. Sant'Ovaia, F. Noronha
doaj   +9 more sources

Subsurface distribution and tectonic setting of the late-Variscan granites in the northwestern Bohemian Massif

Geologische Rundschau: Zeitschrift Fur Allgemeine Geologie, 1997
Integrative gravity modelling reveals the 3D shape, subsurface extent and basal morphology of the late-Variscan granites in the northwestern Bohemian Massif.
Conrad, W., Trzebski, R., Behr, Hans-Jürgen   +2 more
exaly   +4 more sources

Alpine, Variscan, eo-Variscan belts: comparison between hot and cold orogens from the examples of French segments [PDF]

Comptes Rendus. Géoscience, 2023
The Cenozoic Alpine, and Paleozoic Variscan and eo-Variscan collisional belts are compared in the framework of the Wilson cycle considering differences between cold and hot orogens. The W.
Faure, Michel
doaj   +2 more sources

Cadomian S-type granites as basement rocks of the Variscan belt (Massif Central, France): Implications for the crustal evolution of the north Gondwana margin [PDF]

Lithos, 2017
International audienceFrom the Neoproterozoic to the early Paleozoic, the northern Gondwana margin was sequentially shaped by the Cadomian accretionary and the Variscan collisional orogens which offers the opportunity to investigate the relative extent ...
Simon Couzinie, OSCAR Laurent, Marc Poujol   +2 more
exaly   +4 more sources

Exhumation history of the Variscan orogen in western Iberia as inferred from new K-Ar and 40Ar/39Ar data on granites from Portugal

Tectonophysics, 2021
International audienceExhumation of the roots of collapsing orogens is a key process in the evolution of mountain belts, which is critical for the understanding of orogenic cycles. From new structural analyses, K-Ar and 40 Ar/ 39 Ar on muscovite, biotite
A Hildenbrand, F O Marques, Xavier Quidelleur   +2 more
exaly   +2 more sources

The petrogenesis of the Early Permian Variscan granites of the Cornubian Batholith: Lower plate post-collisional peraluminous magmatism in the Rhenohercynian Zone of SW England

Lithos, 2016
The Early Permian Cornubian Batholith was generated during an extensional regime following Variscan convergence within the Rhenohercynian Zone of SW England. Its component granites can be classified, using mineralogical, textural and geochemical criteria,
Robin K Shail
exaly   +3 more sources

Deciphering Iberian Variscan Orogen Magmatism Using the Anisotropy of Magnetic Susceptibility from Granites

Minerals (Basel, Switzerland)
In this paper, we have synthesized the information derived from more than 20 papers and PhD theses on the anisotropy of the magnetic susceptibility (AMS) of 19 Variscan granite plutons, spanning the period between 320 Ma and 296 Ma.
Helena Sant'Ovaia, Claudia Cruz, Ana Gonçalves   +2 more
exaly   +2 more sources

The post-collisional late Variscan ferroan granites of southern Sardinia (Italy): Inferences for inhomogeneity of lower crust

Lithos, 2017
The post-collisional late Variscan magmatism of Sardinia-Corsica batholith attained a peak at about 290 Ma. In southern Sardinia, in the frontal part of the Variscan orogenic wedge, this magmatism is represented by three suites of granitoids, here ...
Aida Maria Conte, Stefano Cuccuru, Massimo D’Antonio   +2 more
exaly   +2 more sources

The Chemical Evolution from Older (323–318 Ma) towards Younger Highly Evolved Tin Granites (315–314 Ma)—Sources and Metal Enrichment in Variscan Granites of the Western Erzgebirge (Central European Variscides, Germany)

Minerals (Basel, Switzerland), 2019
The sources and critical enrichment processes for granite related tin ores are still not well understood. The Erzgebirge represents one of the classical regions for tin mineralization. We investigated the four largest plutons from the Western Erzgebirge (
Marion Tichomirowa, Axel Gerdes, Manuel Lapp   +2 more
exaly   +2 more sources

The role of fractional crystallization in the genesis of early syn-D3, tin-mineralized Variscan two-mica granites from the Carrazeda de Ansiães area, northern Portugal

Lithos, 2012
A multiphase granitic complex (G1–G6) in the Carrazeda de Ansiães area, Central Iberian Zone, was emplaced during syn-kinematic stages of the Variscan orogeny, between 329.9 ± 0.8 Ma and 318.9 ± 1.9 Ma, as determined by ID-TIMS U–Pb on zircon and ...
R J S Teixeira, A M R Neiva, M E P Gomes   +2 more
exaly   +2 more sources