scholarly journals New Early Permian paleomagnetic results from the Brive basin (French Massif Central) and their implications for Late Variscan tectonics

2006 ◽  
Vol 95 (2) ◽  
pp. 306-317 ◽  
Author(s):  
Yan Chen ◽  
Bernard Henry ◽  
Michel Faure ◽  
Jean-François Becq-Giraudon ◽  
Jean-Yves Talbot ◽  
...  
Keyword(s):  
Early Permian ◽  
French Massif Central ◽  
Massif Central ◽  
Brive Basin

Thermal maturation and exhumation of a middle orogenic crust in the Livradois area (French Massif Central)

2011 ◽  
Vol 182 (1) ◽  
pp. 5-24 ◽  
Author(s):  
Véronique Gardien ◽  
Olivier Vanderhaeghe ◽  
Nicolas Arnaud ◽  
Alain Cocherie ◽  
Marion Grange ◽  
...  
Keyword(s):  
Final Stage ◽  
Crustal Melting ◽  
Early Permian ◽  
French Massif Central ◽  
Rapid Cooling ◽  
Massif Central ◽  
Upper Carboniferous ◽  
Peak Metamorphism ◽  
Metamorphic Series ◽  
Granitic Dome

AbstractUpper Carboniferous heating and melting of the middle orogenic crust associated with the emplacement of syntectonic granitoids are documented in the Upper Gneissic Unit of the Livradois area (central part of the French Massif Central). Crustal melting post-dates peak metamorphism conditions (800-625°C, 10-8 kb) dated at 360 ± 4 Ma (U-Th-Pb on monazite). The P-T evolution of the metamorphic series indicates that Barrovian metamorphism was followed by a decompression (from 10 ± 1 kbar to 6 ± 1 kbar) associated with either a decrease in temperature in the southern part of the series or with an increase in temperature (of about 150°C) in the northern part of the series. This evolution records the first step of the exhumation of the series coeval with granitoids intrusion, of which the emplacements were dated at 315 ± 4 and 311 ± 18 Ma (U-Pb on zircon). The final stage of the exhumation is associated with an isobaric cooling of the whole series. Similarity of 40Ar/39Ar ages for biotite in the paragneisses (307-300 Ma) and K-feldspar in the granitoids (306-300 Ma) document rapid cooling for this stage. Moreover dextral reverse mylonites, at the border and the northern part of the metamorphic series indicate north-south compression coeval with the unroofing of the series. Youngest 40Ar-39Ar ages on K-feldspar (274.6 ± 5 Ma) combined with normal shearing in mylonites limiting the Carboniferous Brassac-les-Mines basin document the late Carboniferous-early Permian stage of extension coeval with the upwelling of the Velay granitic dome.

Early Permian extensional shearing of an Ordovician granite: The Saint-Eutrope “C/S-like” orthogneiss (Montagne Noire, French Massif Central)

2012 ◽  
Vol 344 (8) ◽  
pp. 377-384 ◽  
Author(s):  
Pavel Pitra ◽  
Marc Poujol ◽  
Jean Van Den Driessche ◽  
Jean-Charles Poilvet ◽  
Jean-Louis Paquette
Keyword(s):  
Early Permian ◽  
French Massif Central ◽  
Massif Central ◽  
Montagne Noire

scholarly journals New actinopterygians from the Permian of the Brive Basin, and the ichthyofaunas of the French Massif Central

2021 ◽  
Vol 77 (1) ◽  
pp. 145-165
Author(s):  
Stanislav Štamberg ◽  
Jean-Sébastien Steyer
Keyword(s):  
Tropical Climate ◽  
Wide Distribution ◽  
The Other ◽  
French Massif Central ◽  
Time And Space ◽  
Massif Central ◽  
Skull Roof ◽  
Aquatic Vertebrates ◽  
Mountain Chain ◽  
Brive Basin

A new actinopterygian fauna from the Permian of the Brive Basin (Corrèze, Massif Central, France) is described in detail. It is represented by a new pygopterid taxon, Briveichthys chantepieorum gen. et sp. nov., erected and described here on the basis of several well-preserved specimens showing peculiar characters in the bones of the skull roof, parasphenoid, bones of the cheek and opercular apparatus. Other specimens from this new fauna are also described; they are referred to Progyrolepis heyleri Poplin, 1999, also known in the Bourbon-l’Archambault Basin, and Aeduella cf. blainvillei, which is relatively common in the Permian of France. These discoveries show the importance of the Brive Basin which was previously considered as a rather barren basin in term of palaeontology. This new fauna from Brive is compared with the other Permian ichthyofaunas from France: it is less rich in terms of specimen numbers than the faunas of Bourbon-l’Archambault and Autun, but it is more diversified in terms of number of taxa than the faunas of Lodève and L’Argentière (Ardêche). These actinopterygians, together with other aquatic vertebrates (e.g., acanthodians, sharks etc.), were widespread and diversified in the Hercynian Mountain Chain during the Permian. They indicate that the French basins were connected in time and space. The wide distribution of these aquatic taxa may have been favoured by numerous hydric systems (lakes, rivers etc.) which were well developed under the tropical climate.

Evaluating Holocene natural hazards in the French Massif Central from a regional lake sediment approach

2021 ◽  
Author(s):  
E. Chapron ◽  
A. Foucher ◽  
L. Chassiot ◽  
W. Fleurdeus ◽  
V. Arricau ◽  
...  
Keyword(s):  
Natural Hazards ◽  
Lake Sediment ◽  
French Massif Central ◽  
Massif Central

Sellaphora labernardierei (Sellaphoraceae, Bacillariophyta), a new epilithic species from French spring and four new combinations within the genus Sellaphora

Phytotaxa ◽  
2016 ◽  
Vol 260 (3) ◽  
pp. 235 ◽  
Author(s):  
AUDE BEAUGER ◽  
CARLOS E. WETZEL ◽  
OLIVIER VOLDOIRE ◽  
ALEXANDRE GARREAU ◽  
LUC ECTOR
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Central Area ◽  
Mineral Waters ◽  
New Combinations ◽  
French Massif Central ◽  
Small Species ◽  
Massif Central ◽  
Floristic Survey ◽  
Scanning Electron

During a floristic survey of freshwater springs in the French Massif Central region, a new Sellaphora species (Bacillariophyceae) was found and is hereby described: Sellaphora labernardierei sp. nov. This new small species, with linear to linear-elliptical valves, slightly inflated in the middle, is formally described using light and scanning electron microscopy. The species has a single H-shaped chloroplast and striae usually biseriate tending to be uniseriate near the centre of the valve. The valve dimensions, the valve, pole and central area shapes, and the striae density and pattern allow their separation from similar taxa belonging to the genera Eolimna, Naviculadicta and Sellaphora. The ecological preferences of Sellaphora labernardierei are mineral waters with high nitrate concentrations. The examination of similar taxa belonging to the genera Eolimna and Naviculadicta and their characteristics lead to propose four new combinations of Sellaphora species.

scholarly journals Tephras in lacustrine sediments of the Sarliève marsh (French Massif Central): age and preservation

2006 ◽  
Vol 338 (16) ◽  
pp. 1141-1149 ◽  
Author(s):  
Agathe Fourmont ◽  
Jean-Jacques Macaire ◽  
Jean-Gabriel Bréhéret ◽  
Jacqueline Argant ◽  
Béatrice Prat ◽  
...  
Keyword(s):  
Lacustrine Sediments ◽  
French Massif Central ◽  
Massif Central
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