Results 41 to 50 of about 823 (158)

Zircon age of vaugnerite intrusives from the Central and Southern Vosges crystalline massif (E France): contribution to the geodynamics of the European Variscan belt

BSGF - Earth Sciences Bulletin, 2020
To provide a better picture of the active geodynamics along the Variscan suture zones during the late collisional stage (particularly regarding the evolution of the orogenic system towards HT conditions), we focused here on vaugnerites, which consist of ...
Guillot François, Averbuch Olivier, Dubois Michel, Durand Cyril, Lanari Pierre, Gauthier Arnaud   +5 more
doaj   +1 more source

Anisotropy of magnetic susceptibility of the Pyrenean granites

Journal of Maps, 2017
In this paper, we report on a compilation of more than 2200 sites (more than 10,000 individual measurements) where anisotropy of magnetic susceptibility (AMS) was studied in granites from the Variscan Pyrenees.
Manuel Porquet, Emilio L. Pueyo, Teresa Román-Berdiel, Philippe Olivier, Luis A. Longares, Julia Cuevas, Javier Ramajo, the Geokin3DPyr working group by alphabetical order, Borja Antolín, Aitor Aranguren, Jean Baptiste Auréjac, Jean-Luc Bouchez, Antonio M. Casas, Yoann Denèle, Gerard Gleizes, Asier Hilario, Esther Izquierdo-Llavall, Dennis Leblanc, Belén Oliva-Urcia, Vicente Santana, José M. Tubía, Nestor Vegas   +21 more
doaj   +1 more source

A precise late Permian 40Ar/39Ar age for Central Iberian camptonitic lamprohyres

Geologica Acta, 2006
The Avila batholith of central Spain is composed, predominantly, of crustal-melt peraluminous granites cut by small-scale mafic alkaline bodies. Dating of the Gredos sector mafic camptonitic lamprophyre dykes was undertaken to constrain the Late Variscan
J.H. SCARROW, F. BEA, P. GONZÁLEZ MONTERO, J. F. MOLINA PALMA, ALAN VAUGHAN   +4 more
doaj   +1 more source

Variscan Plutonism in the Geodynamic Evolution of the Central Iberian Zone of Portugal: Castelo Branco Pluton as Another Piece of the Puzzle

Geosciences
A multidisciplinary analysis of the Pennsylvanian Castelo Branco pluton of Central Iberian Zone (Iberian Variscan belt) was made, focusing on its magnetic behavior and fabric, microstructures, microfractures, and radiometric and gravimetric anomalies ...
Cláudia Cruz, Helena Sant’Ovaia, Helena C. B. Martins, Isabel M. H. R. Antunes, Armando Rocha, Fernando Noronha   +5 more
doaj   +1 more source

Correlating magnetic fabrics with finite strain : comparing results from mudrocks in the Variscan and Appalachian Orogens

, 2004
New magnetic anisotropy data from Variscan mudstones collected in the Cantabrian Arc, N Spain constrain the corresponding strain (shortening). The results are based on our previous study of mudrocks from the Valley and Ridge Province (Appalachians) where
Van der Pluijm, Ben A., Parés, Josep María, Parés, Josep Mª, Van der Pluijm, B.A., Van Der Pluijm, B. A., Parés, J. M.   +5 more
core   +1 more source

Geochemical and isotopic constraints on the petrogenesis of Early Ordovician granodiorite and Variscan two-mica granites from the Gouveia area, central Portugal [PDF]

, 2009
A biotite granodiorite and seven Sn-bearing two-mica granites crop out in the Gouveia area, central Portugal. A SHRIMP U–Th–Pb zircon age from the granodiorite, and monazite ages from four of the two-mica granites, show that they are of Early ...
Williams, I. S., Ramos, J.M.F., Antunes, I. M. H. R., Williams, Ian, Antunes, I.M.H.R., Silva, M. M. V. G., Ramos, J. M. F., Silva, M.M.V.G., Neiva, A. M. R., Neiva, A.M.R., Gomes, M.E.P., Gomes, M. E. P., Williams, I.S.   +12 more
core   +1 more source

On the nature and composition of crustal sources for late Variscan magmatism – insights from southern Sardinia (Italy)

, 2023
The external zone of the Variscan chain in southern Sardinia hosts several short-lived, both composite, and homogeneous plutons emplaced at shallow crustal levels during post-collisional extension. Except for Arbus composite pluton, dated 304 ± 3 Ma,
Leonardo Casini, Stefano Naitza, Giacomo Oggiano, Alfredo Idini, Francesco Secchi, Claire Bucholz, Milan Kohut, Tommaso Giovanardi   +7 more
core  

The Material Basis of 18th‐Century Meissen Porcelain

Archaeometry, EarlyView.
ABSTRACT In the summer of 1708, the quest for making hard‐paste porcelain from Saxonian clay and other mineral resources succeeded. This was achieved by applying as its essential ingredient newly discovered pure kaolin from Heidelsberg near Aue, western Saxon Ore Mountains.
Robert B. Heimann
wiley   +1 more source

Vertical profiling of shock attenuation at the Rochechouart impact structure, France

Meteoritics &Planetary Science, EarlyView.
Abstract Rochechouart, south‐west France, is a complex impact structure. Here, we present the first report of shock barometry of quartz from what are likely parautochthonous basement units at depth, based on samples from the 2017 C.I.R.I.R drilling campaign. The crystallographic orientations of 725 sets of PDFs in 512 quartz grains in samples from four
P. Struzynska, S. Alwmark, C. Alwmark, M. H. Poelchau, P. Lambert   +4 more
wiley   +1 more source

Experimental Crystallization of the Beauvoir Granite as a Model for the Evolution of Variscan Rare Metal Magmas

Journal of Petrology, 2022
Abstract New experiments on the strongly peraluminous, Li-, P- and F-rich Beauvoir granite (Massif Central, France) provide a basis for understanding crystallization and chemical fractionation in Variscan rare metal magmas. Crystallization experiments were performed on two natural granite compositions under H2O-saturated conditions at ...
openaire   +3 more sources