Zircon age of vaugnerite intrusives from the central and southern Vosges crystalline massif (E France); contribution to the geodynamics of the European Variscan belt

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 mafic ultra-potassic magmatic rocks, intrusive...

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Bibliographic Details
Published in:Bulletin de la Société géologique de France 2020, Vol.191, p.26
Main Authors: Guillot, François, Averbuch, Olivier, Dubois, Michel, Durand, Cyril, Lanari, Pierre, Gauthier, Arnaud
Format: Article
Language:English
Subjects:
absolute age
Ballons Complex
Carboniferous
Continental crust
Continental margins
Cretes Complex
dates
delamination
Earth Sciences
eastern France
Europe
France
Geochemistry
Geochronology
geodynamics
geologic thermometry
gneisses
Granite
granite gneiss
igneous and metamorphic rocks
igneous rocks
intrusions
Lead
lithosphere
Lower Carboniferous
magmatism
Mass spectrometry
metals
metamorphic rocks
Mineralogy
nesosilicates
Ordovician
orogenic belts
orogeny
orthosilicates
Paleozoic
partial melting
Petrography
Petrology
plutonic rocks
plutons
potassic composition
rare earths
Rocks
Sciences of the Universe
silicates
Structural geology
syn-collisional lithospheric delamination
Tectonics
U/Pb
ultra-potassic magmatism
Upwelling
Variscan Orogeny
vaugnerite
vaugnerites
visean
Volcanoes
vosges
Vosges Mountains
Western Europe
zircon
zircon group
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Summary: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 mafic ultra-potassic magmatic rocks, intrusive into the granite-gneiss sequences of the Variscan Vosges crystalline massif. Those rocks, though subordinate in volume, are frequently associated with late-collisional granites. In the Central-Southern Vosges, they appear either as (1) pluton margin of the Southern Vosges Ballons granite complex or (2) composite dykes intrusive into migmatite and metamorphic sequences classically referred to as granite-gneiss unit (Central Vosges). Both types correspond to melanocratic rocks with prominent, Mg-rich, biotite and hornblende (20-40% vol., 64
ISSN:0037-9409
1777-5817
1777-5817
DOI:10.1051/bsgf/2020027