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International Journal of Earth Sciences

, Volume 106, Issue 2, pp 477–500 | Cite as

Two-stage partial melting during the Variscan extensional tectonics (Montagne Noire, France)

  • Marc Poujol
  • Pavel Pitra
  • Jean Van Den Driessche
  • Romain Tartèse
  • Gilles Ruffet
  • Jean-Louis Paquette
  • Jean-Charles Poilvet
Original Paper

Abstract

One of the striking features that characterise the late stages of the Variscan orogeny is the development of gneiss and migmatite domes, as well as extensional Late Carboniferous and Permian sedimentary basins. It remains a matter of debate whether the formation of domes was related to the well-documented late orogenic extension or to the contractional tectonics that preceded. Migmatization and magmatism are expected to predate extension if the domes are compression-related regional anticlines, but they must both precede and be contemporaneous with extension if they are extensional core complexes. In the Montagne Noire area (southern French Massif Central), where migmatization, magmatism and the deformation framework are well documented, the age of the extensional event was unequivocally constrained to 300–290 Ma. Therefore, dating migmatization in this area is a key point for discriminating between the two hypotheses and understanding the Late Palaeozoic evolution of this part of the Variscan belt. For this purpose, a migmatite and an associated anatectic granite from the Montagne Noire dome were dated by LA-ICP-MS (U–Th–Pb on zircon and monazite) and laser probe 40Ar-39Ar (K–Ar on muscovite). Although zircon did not record any Variscan age unequivocally related to compression (380-330 Ma), two age groups were identified from the monazite crystals. A first event, at ca. 319 Ma (U–Th–Pb on monazite), is interpreted as a first stage of migmatization and as the emplacement age of the granite, respectively. A second event at ca. 298–295 Ma, recorded by monazite (U–Th–Pb) and by the muscovite 40Ar-39Ar system in the migmatite and in the granite, could be interpreted as a fluid-induced event, probably related to a second melting event identified through the syn-extensional emplacement of the nearby Montalet leucogranite ca. 295 Ma ago. The ages of these two events post-date the Variscan compression and agree with an overall extensional context for the development of the Montagne Noire dome-shaped massif. Comparison of these results with published chemical (EPMA) dating of monazite from the same rocks demonstrates that the type of statistical treatment applied to EPMA data is crucial in order to resolve different monazite age populations.

Keywords

Monazite LA-ICP-MS U–Th–Pb dating Muscovite 40Ar-39Ar dating Variscan Montagne Noire 

Notes

Acknowledgments

Xavier Le Coz is acknowledged for making promptly the thin sections required for our study, Yann Lepagnot for the efficient rock crushing, and Thomas Delhaye for help with NanoSIMS analysis. Jean-Marc Montel and an anonymous reviewer are thanked for their constructive remarks on a previous version of this manuscript. The reviews of P. Rey and E. Oliot are acknowledged.

Supplementary material

531_2016_1369_MOESM1_ESM.pdf (51 kb)
Supplementary material 1 (PDF 51 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Marc Poujol
    • 1
  • Pavel Pitra
    • 1
  • Jean Van Den Driessche
    • 1
  • Romain Tartèse
    • 2
    • 3
  • Gilles Ruffet
    • 1
  • Jean-Louis Paquette
    • 4
  • Jean-Charles Poilvet
    • 1
  1. 1.Géosciences Rennes, UMR CNRS 6118, OSURUniversité Rennes 1Rennes CedexFrance
  2. 2.Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, Muséum National d’Histoire NaturelleSorbonne Universités, CNRS, UMPC & IRDParisFrance
  3. 3.Planetary and Space SciencesThe Open UniversityMilton KeynesUK
  4. 4.UMR CNRS 6524, Laboratoire Magmas et VolcansUniversité Blaise PascalClermont-Ferrand CedexFrance

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