Results 21 to 30 of about 823 (158)

Polyphased rare-element magmatism during late orogenic evolution: geochronological constraints from NW Variscan Iberia

BSGF - Earth Sciences Bulletin, 2022
Rare-element granites and pegmatites represent important sources of raw materials for “clean, green and high technologies”, such as lithium and tantalum, for example.
Melleton Jérémie, Gloaguen Eric, Frei Dirk, Lima Alexandre, Vieira Romeu, Martins Tania   +5 more
doaj   +1 more source

Fabric Analysis in Upper Crustal Post-Collisional Granitoids from the Serre Batholith (Southern Italy): Results from Microstructural and AMS Investigations

Geosciences, 2021
The Serre Batholith in Central Calabria (southern Italy) represents the intermediate portion of a continuous cross-section of late Variscan continental crust.
Patrizia Fiannacca, Damiano Russo, Eugenio Fazio, Rosolino Cirrincione, Manish A. Mamtani   +4 more
doaj   +1 more source

Contrasting appinites, vaugnerites and related granitoids from the NW Iberian Massif: insight into mantle and crustal sources [PDF]

European Journal of Mineralogy, 2023
Post-collisional Mg–K-rich mafic rocks with associated granitoids appear regularly in most orogens. They are relevant to evaluate the mantle role in the genesis of granitoids and thereby of the continental crust itself. The most characteristic Mg–K mafic
G. Galán, G. Gallastegui, A. Cuesta, G. Corretgé, O. Suárez, L. González-Menéndez   +5 more
doaj   +1 more source

A first attempt at a provenance study in the Jadar block (Serbia) by means of U-Pb zircon geochronology [PDF]

Geološki Anali Balkanskoga Poluostrva, 2023
U-Pb geochronology of zircon grains retrieved from magmatic rocks intruding the Jadar block terrane in the central Balkans is used here to add new constraints on the terrane accretion processes and the provenance of crustal sources of this potentially ...
Löwe Georg, Prelević Dejan, Ustaszewski Kamil   +2 more
doaj   +1 more source

A reactive assimilation model for regional-scale cordierite-bearing granitoids: geochemical evidence from the Late Variscan granites of the Central Iberian Zone, Spain [PDF]

, 2008
Regional scale biotite and cordierite-bearing granites (s.l.) in the Variscan of the Central Iberian Zone (CIZ) are spatially closely associated with cordierite-rich nebulites and cordierite-bearing two-mica granites, and with cordierite-rich high grade ...
Ellam, R.M., Ugidos, J. M., Stephens, W. E., Carnicero, A., Stephens, W.E., Ellam, R. M., Ugidos, J.M.   +6 more
core   +1 more source

Age of the basement beneath the Mesozoic Lusitanian Basin revealed by granitic xenoliths from the Papôa volcanic breccia (West Iberia)

Geologica Acta, 2020
The dyke of the Papôa volcanic breccia cross-cutting the Lower Jurassic sequence of the Lusitanian Basin (West Iberia) contains granitic xenoliths. In this study, for the first time, U-Th-Pb zircon analysis of two xenoliths yielded 298±4Ma for biotite ...
M.F. Pereira, C. Gama, J.B. Silva, Í. Dias da Silva   +3 more
doaj   +3 more sources

Niemcza diorites and moznodiorites (Sudetes, SW Poland): a record of changing geotectonic setting at ca. 340 Ma [PDF]

, 2013
Granites sensu lato in the Sudetes intruded in several episodes during the Variscan orogeny recording different stages of crust and mantle evolution.
Kierczak, J., Pietranik, A., Kierczak, Jakub, Storey, C., Pietranik, Anna, Storey, Craig   +5 more
core   +1 more source

Western Carpathian mid-Permian Magmatism: Petrographic, geochemical, and geochronological data

Data in Brief, 2021
This study presents geochemical and geochronological data from rock samples collected from the Western Carpathian mountains, eastern Slovakia. Granite assemblages that intrude the Gemeric and Veporic Superunits were imaged using a petrographic microscope
Gabriel Villaseñor, Elizabeth J. Catlos, Igor Broska, Milan Kohút, Ľubomír Hraško, Kimberly Aguilera, Thomas M. Etzel, J. Richard Kyle, Daniel F. Stockli   +8 more
doaj   +1 more source

Geology of late-Variscan Sàrrabus pluton (south-eastern Sardinia, Italy)

Journal of Maps, 2021
This paper deals with the geological mapping of the late-Variscan Sàrrabus pluton, (south-eastern Sardinia), a shallow multiple and composite igneous complex dominated by several generations of granodiorites, metaluminous and peraluminous granites and ...
F. Secchi, S. Naitza, G. Oggiano, S. Cuccuru, A. Puccini, A. M. Conte, T. Giovanardi, M. Mazzucchelli   +7 more
doaj   +1 more source

Variscan thrusting in I- and S-type granitic rocks of the Tribeč Mountains, Western Carpathians (Slovakia): evidence from mineral compositions and monazite dating

Geologica Carpathica, 2015
The Tribeč granitic core (Tatric Superunit, Western Carpathians, Slovakia) is formed by Devonian/Lower Carboniferous, calc-alkaline I- and S-type granitic rocks and their altered equivalents, which provide a rare opportunity to study the Variscan ...
Broska Igor, Petrík Igor
doaj   +1 more source