Results 61 to 70 of about 1,408 (212)

Long‐Term Storage of Meteoric Water in the Variscan Basement: Stable Isotope Constraints (δD–δ18O)

Terra Nova, Volume 38, Issue 2, Page 116-123, April 2026.
ABSTRACT F‐Ba‐Pb‐Zn (±Ag) deposits near the unconformity between the Armorican and Aquitaine basins formed by mixing surface waters and brines with fluid ascending from the basement. To better constrain the source of this fluid and the conditions of mixing, we analyzed the hydrogen (δDwater) and oxygen (δ18Owater) isotopic composition of water trapped ...
Loïc Bouat, Pierre Strzerzynski, Véronique Gardien   +2 more
wiley   +1 more source

Physicochemical Conditions of the Devonian-Jurassic Continental Deep Biosphere Tracked by Carbonate Clumped Isotope Temperatures of Granite-Hosted Carbonate Veins

Geofluids, 2023
Previous studies have shown that microorganisms thrive in oligotrophic fracture systems, and metabolisms include consumption and production of methane. In the Laxemar, Götemar, and Forsmark areas of Sweden, ancient microbial activity has previously been ...
Adhipa Herlambang, Cédric M. John, Henrik Drake   +2 more
doaj   +1 more source

Dating C/S Structures in Syntectonic Granites by In Situ Rb‐Sr Analyses on Muscovite

Terra Nova, Volume 38, Issue 2, Page 124-129, April 2026.
ABSTRACT The interplay of crystallisation, deformation and fluid–rock interactions makes deciphering geochronological information complex in syntectonic granites. In this study, we apply in situ Rb‐Sr analyses to selected samples from the Questembert Variscan syntectonic granite in Western France, which was emplaced along the South Armorican Shear Zone
Philippe Boulvais, Romain Tartèse
wiley   +1 more source

Lithotectonic units of the Cabeço de Vide Massif (Ossa-Morena Zone, SW Iberian Massif): a bedrock map to decipher superimposed orogenies

Journal of Maps
This study provides a new cartographic framework for a geologically complex region in the SW Iberian Massif (central-east Portugal). We have redefined lithological ensembles and clarified structural relationships between rock types (unconformities and ...
Diana Moreno-Martín, Rubén Díez Fernández, Luis González Menéndez, Esther Rojo-Pérez, Manuel Francisco Pereira, Ricardo Arenas   +5 more
doaj   +1 more source

3‐D Modeling of Differential Exhumation of Ultrahigh‐Pressure Metamorphic Rocks Driven by Increasing Plate Divergence

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.
Abstract Petrological and seismic constraints suggest differential sampling depth for ultrahigh pressure (UHP) metamorphic rocks exposed in different segments of the fossil subduction zone of the Western Alps. However, the mechanisms for the observed differential exhumation remain to be understood. Here, we account for the continental margin subduction
Xinxin Wang, Liang Zhao, Marco G. Malusà, Weiqiang Ji, Jie Yuan   +4 more
wiley   +1 more source

Late Carboniferous Geomagnetic Field Events Recorded in Post‐Collisional Altenberg–Teplice Caldera, Variscan Belt

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 3, March 2026.
Abstract Characteristic remanent magnetizations isolated from the late Variscan Altenberg–Teplice Caldera exhibit paleomagnetic directions, ranging from those consistent with the expected primary Late Carboniferous geomagnetic field to intermediate directions that significantly diverge from the dipole states.
P. Vitouš, M. S. Petronis, M. S. Foucher, F. Tomek   +3 more
wiley   +1 more source

VARNET-96: influence of the Variscan and Caledonian orogenies on crustal structure in SW Ireland [PDF]

Geophysical Journal International, 2000
SUMMARY VARNET, an international multidisciplinary project, was designed to examine the ‘Variscan Front’ in the southwest of Ireland. As part of the seismic experiment a 200 km long wide-angle seismic pro¢le (Line A) was recorded from the Old Head of Kinsale in the south of Ireland to Galway Bay on the west coast.
Landes, M., Prodehl, C., Hauser, F., Jacob, A., Vermeulen, N.   +4 more
openaire   +3 more sources

Geological investigations of the Lizard District, Cornwall, England: 1818–1883 [PDF]

History of Geo- and Space Sciences
A lower Paleozoic slab of oceanic lithosphere was obducted onto the southern margin of Avalonia during the Variscan orogeny and is now exposed throughout the Lizard District of Cornwall, England.
C. N. Drummond
doaj   +1 more source

Seismicity and Seismotectonics in the Cantabrian‐Pyrenean Zone (N Spain) Using a Dense Temporary Network of Broadband Seismic Stations

Tectonics, Volume 45, Issue 3, March 2026.
Abstract Earthquakes in intraplate regions are often scattered and difficult to associate with specific geological structures, requiring detailed surveys to identify active faults. Improving knowledge of local seismicity in these areas is essential for accurate seismic hazard assessment and for safe planning of economic activities that could affect ...
A. Olivar‐Castaño, A. Díaz‐González, J. A. Pulgar, D. Pedreira, J. M. González‐Cortina, J. Gallastegui, J. Díaz, J. Gallart   +7 more
wiley   +1 more source

Geology and tectonic setting of the Fornovolasco area, Alpi Apuane (Tuscany, Italy)

Journal of Maps, 2018
The study area is located in the Alpi Apuane (Tuscany, Italy), and extends between N 44°0′49.883″–E 10°20′23.467″ (SW corner) and N 44°2′53.403″–E 10°23′19.175″ (NE corner).
Diego Pieruccioni, Yuri Galanti, Cristian Biagioni, Giancarlo Molli   +3 more
doaj   +1 more source