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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/33319

Title: Temporal relationships between Mg-K mafic magmatism and catastrophic melting of the Variscan crust in the southern part of Velay Complex (Massif Central, France)
Authors: Couzinié, Simon
Moyen, Jean-François
Villaros, Arnaud
Paquette, Jean-Louis
Scarrow, Jane H.
Marignac, Christian
Issue Date: 2014
Abstract: Mg-K mafic intrusive rocks are commonly observed during the late stages of the evolution of orogenic belts. The Variscan French Massif Central has many outcrops of these rocks, locally called vaugnerites. Such magmas have a mantle-derived origin and therefore allow discussion of the role of mantle melting and crust-mantle interactions during late-orogenic processes. In the Southern Velay area of the French Massif Central, LA-ICPMS U-Pb dating on zircons and monazites from three vaugnerites and four coeval granites reveals that the two igneous suites formed simultaneously, at c. 305 Ma. This major igneous event followed after an early, protracted melting stage that lasted for 20-30 My and generated migmatites, but the melt was not extracted efficiently and therefore no granite plutons were formed. This demonstrates that widespread crustal anatexis, melt extraction and granite production were synchronous with the intrusion of vaugneritic mantle-derived melts in the crust. The rapid heating and subsequent melting of the crust led to upward flow of partially molten rocks, doming and collapse of the belt.
Sponsorship: JHS was financially supported by the Spanish grant CGL2008–02864 and the Andalusian grant RNM1595.
Publisher: Czech Geological Society
Keywords: Granite
Variscan
French Massif Central
Vaugnerite
U-Pb geochronology
URI: http://hdl.handle.net/10481/33319
ISSN: 1802-6222
1803-1943
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Couzinié, S.; et al. Temporal relationships between Mg-K mafic magmatism and catastrophic melting of the Variscan crust in the southern part of Velay Complex (Massif Central, France). Journal of Geosciences, 59(1): 69-86 (2014). [http://hdl.handle.net/10481/33319]
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