granitic dome
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CATENA ◽  
2021 ◽  
Vol 199 ◽  
pp. 105084
Author(s):  
Nele Meyer ◽  
Michael Kuhwald ◽  
James F. Petersen ◽  
Rainer Duttmann

2011 ◽  
Vol 182 (1) ◽  
pp. 5-24 ◽  
Author(s):  
Véronique Gardien ◽  
Olivier Vanderhaeghe ◽  
Nicolas Arnaud ◽  
Alain Cocherie ◽  
Marion Grange ◽  
...  

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.


1994 ◽  
Vol 16 (6) ◽  
pp. 839-852 ◽  
Author(s):  
Jean-Louis Lagarde ◽  
Christophe Dallain ◽  
Patrick Ledru ◽  
Gabriel Courrioux

1945 ◽  
Vol S5-XV (9) ◽  
pp. 639-641
Author(s):  
Philibert Russo

Abstract The north-northeast fractures in the Saint-Bonnet-de-Joux granitic dome, France, and in the Triassic-Jurassic formations on its flanks are due to gravity dislocations caused by pressure from the east during Oligocene Alpine movements and the radial fractures to upper Miocene crustal movements of greater depth.


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