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Journal of the Geological Society

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Variscan evolution of the Tanneron massif, SE France, examined through U–Pb monazite ages

¹ Institut für Geowissenschaften, Johannes Gutenberg Universität, Becherweg 21, 55099 Mainz, Germany (e-mail: demoux{at}uni-mainz.de)
² Géosciences Azur (UMR 6526), Université de Nice Sophia–Antipolis, Parc Valrose, F-06108 Nice Cedex 2, France

The Tanneron massif belongs to the southernmost segment of the Variscan belt in France and is composed of migmatitic orthogneisses and paragneisses cross-cut by a main tonalite–granite complex. Late Carboniferous detrital basins are bounded by north–south-trending ductile to brittle normal faults and delineate three distinct zones. Our new isotope dilution U–Pb monazite dating indicates a pre-Variscan history in the central part of the massif recorded by monazites from an orthogneiss yielding ages from 440 to 410 Ma, whereas monazites from a migmatitic paragneiss record a late Carboniferous high-Tevent at 317 ± 1 Ma. In the eastern part, a migmatization event is recorded by monazites from a synkinematic leucogranitic layer and a mylonitic orthogneiss yielding ages of 309 ± 5 and 310 ± 2 Ma, respectively. Later post-collisional magmatism related to lithospheric thinning is recorded by the intrusion of undeformed granitic bodies at 302 ± 4 and 297 ± 5 Ma, and marks the final stage of the Variscan evolution. The data indicate the presence of two crustal blocks, displaying different levels of exposure of the Variscan crust. The overall tectonomagmatic evolution of this massif suggests a strong affinity with the internal part of the Variscan belt.

This article has been cited by other articles:

				Y. Rolland, M. Corsini, and A. Demoux Metamorphic and structural evolution of the Maures-Tanneron massif (SE Variscan chain): evidence of doming along a transpressional margin Bulletin de la Societe Geologique de France, May 1, 2009; 180(3): 217 - 230. [Abstract] [Full Text] [PDF]

				G. Dallagiovanna, L. Gaggero, M. Maino, S. Seno, and M. Tiepolo U-Pb zircon ages for post-Variscan volcanism in the Ligurian Alps(Northern Italy) Journal of the Geological Society, January 1, 2009; 166(1): 101 - 114. [Abstract] [Full Text] [PDF]