Results 51 to 60 of about 1,408 (212)

The Long-Lasting Exhumation History of the Ötztal-Stubai Complex (Eastern European Alps): New Constraints from Zircon (U–Th)/He Age-Elevation Profiles and Thermokinematic Modeling [PDF]

Lithosphere
The Eastern European Alps formed during two orogenic cycles, which took place in the Cretaceous and Cenozoic, respectively. In the Ötztal-Stubai Complex—a thrust sheet of Variscan basement and Permo-Mesozoic cover rocks—the record of the first (Eoalpine)
Kyra Hölzer, Reinhard Wolff, Ralf Hetzel, István Dunkl   +3 more
doaj   +1 more source

Reassessing the intrusive tempo and magma genesis of the late Variscan Aar batholith: U–Pb geochronology, trace element and initial Hf isotope composition of zircon

Swiss Journal of Geosciences, 2022
The Variscan orogeny was responsible for the formation of a significant volume of igneous basement throughout present-day Europe. Detailed understanding of these rocks has, however, been obfuscated by significant overprinting during younger geologic ...
Mélissa Ruiz, Urs Schaltegger, Sean P. Gaynor, Massimo Chiaradia, Jürgen Abrecht, Christian Gisler, Federico Giovanoli, Michael Wiederkehr   +7 more
doaj   +1 more source

Long‐Term Deformation in the Alpine‐Provence Foreland Constrained by In Situ Calcite U‐Pb Dating

Tectonics, Volume 45, Issue 6, June 2026.
Abstract The evolution of the Alpine‐Provence foreland is characterized by multiple deformation phases since the Mesozoic, representing successive compressional and extensional episodes. The precise timing and spatial evolution of these deformation phases remain poorly constrained due to the lack of absolute geochronological data. Here, we present U–Pb
Dorian Bienveignant, Stéphane Schwartz, Matthias Bernet, Yann Rolland, Julien Léger, Adrien Vezinet, Nordine Bouden, Clara Boullerne, Jerome Nomade, Louise Boschetti, Thierry Dumont, Mélanie Balvay, Perach Nuriel   +12 more
wiley   +1 more source

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

Post‐Eocene 90° CCW Rotation of Sardinia‐South Corsica: Paleomagnetic Evidence From Permian‐Cretaceous Sediments of Nurra (NW Sardinia)

Tectonics, Volume 45, Issue 5, May 2026.
Abstract The paleomagnetism of Miocene calc‐alkaline volcanics and sediments from Sardinia has firmly showed that the Corsica‐Sardinia microplate rotated 50°–60° counterclockwise (CCW) with respect to Europe between 21 and 15 Ma, during its drift from the Provencal margin. However, Permian to Eocene rocks from central‐south Sardinia revealed higher (up
Gaia Siravo, Fabio Speranza, Giacomo Oggiano, Lilla Spagnuolo   +3 more
wiley   +1 more source

The Cu–Pb–Zn-bearing veins of the Bou Skour deposit (Eastern Anti-Atlas, Morocco): structural control and tectonic evolution

Comptes Rendus. Géoscience, 2021
In the central Saghro massif of the Moroccan Anti-Atlas belt, the Bou Skour polymetallic deposit is hosted within mafic to felsic rocks of the Ediacaran Saghro Group and the lower Ouarzazate Group together with Pan-African plutons and dykes.
Aabi, Ayoub, Baidder, Lahssen, Hejja, Younes, El Azmi, Mohammed, Nait Bba, Abdellah, Otmane, Khadija   +5 more
doaj   +1 more source

Garnet–Clinopyroxene Double‐Layered Coronae in a Metagabbronorite From the High‐Grade Metamorphic Gföhl Unit, Moldanubian Zone

Journal of Metamorphic Geology, Volume 44, Issue 4, Page 311-336, May 2026.
ABSTRACT This study investigates garnet–clinopyroxene double‐layered coronae in a metagabbronorite from the high‐grade metamorphic Gföhl Unit (Bohemian Massif). The coronae formed at the interfaces between relic magmatic orthopyroxene, still preserved in the cores of the coronae, and the plagioclase‐rich rock matrix.
Rene Asenbaum, Tereza Nemeškalová, Martin Racek, Vojtěch Janoušek, Julian Portenkirchner, Rainer Abart   +5 more
wiley   +1 more source

A >300 Myr Long‐Lived Topographic Highland Along the Northern North China Craton Margin Driven by Multistage Continental Convergence

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Topographic highlands commonly develop along convergent plate boundaries through long‐term processes such as subduction and continental collision. However, the pre‐Cenozoic mountain‐building history of deep‐time orogenic systems in northeastern Pangaea remains poorly constrained due to later tectonic overprinting and denudation.
Heng Peng, Licheng Wang, Jianqiang Wang, Yazuo Niu, Yahui Yue, Jingbo Sun, Bitian Wei, Chiyang Liu, Massimiliano Zattin, Lin Ding   +9 more
wiley   +1 more source

Tectonic evolution of the Rehamna metamorphic dome (Morocco) in the context of the Alleghanian-Variscan orogeny

, 2014
International audienceStructural and 40Ar/39Ar geochronological investigations of the Rehamna Massif (Meseta, Moroccan Variscan belt) provide new constraints on the tectonic evolution of the Alleghanian-Variscan orogen during the Upper Paleozoic.
Jean-François Ghienne, Karel Schulmann, El Houicha, M., Schulmann, Karel, Michel Corsini, Francis Chopin, Chopin, Francis, Corsini, Michel, Mohamed El Houicha, Edel, J.B., El Houicha, Mohamed, Edel, Jean-Bernard, Jean-Bernard Edel, Ghienne, Jean-François   +13 more
core   +1 more source

A Common Mantle Source for the Endogenous CO2 Degassed at the Eifel (Western Germany) and the Ardennes (Eastern Belgium) Regions

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 4, April 2026.
Abstract Tectonic CO2 Earth degassing is globally relevant and has probably controlled climate on a geological scale (Brune et al., 2019, https://doi.org/10.1038/s41561‐017‐0003‐6). Endogenous CO2 outgassing from rifting areas remains poorly constrained, with most available data from the East African Rift.
Lisa Ricci, Francesco Frondini, Daniele Morgavi, Stefano Caliro, Andrea Luca Rizzo, Tobias P. Fischer, Giovanni Chiodini   +6 more
wiley   +1 more source