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Lake Pavin pp 129-142 | Cite as

Magmatic Evolution of Pavin’s Group of Volcanoes: Petrology, Geochemistry and Modeling of Differentiation Processes. A Preliminary Study

  • Benoît Villemant
  • Benoît Caron
  • Pauline Thierry
  • Pierre Boivin
Chapter

Abstract

The volcanoes of the Pavin group (Montcineyre, Estivadoux, Montchal and Pavin) represent the most recent (~7 ky) volcanic activity in the Chaîne des Puys s.l.) and also occupy a particular geographical and structural position in this volcanic chain. Petrology and geochemistry of the volcanic products (lava flows, scoriae, bombs and pumice clasts) of the different edifices show that they define a magma differentiation series from primary basalts (Montcineyre lava flow) to benmoreites (Pavin pumice clasts) with close similarities with that of the Chaîne des Puys (stricto sensu). It is however characterized by some significant difference in the relative behavior of K2O and of numerous trace elements such as Sc, Co, Y, REE, Nb, Ta. These specific behaviors, in particular the relatively high bulk partition coefficients of Nb and Ta are characteristic of the fractionation of amphibole which is the only major mineral phase able to significantly fractionate these incompatible elements in basaltic to benmoreitic magmas. A quantitative modeling of the differentiation process using major and trace element partition coefficients is proposed which evidence the very early fractionation of amphibole from the most primary basaltic melts. This result is consistent with petrological observations and confirms the earlier and more efficient fractionation of amphibole at the expense of clinopyroxene in magmas of the Pavin group compared to those of the Chaîne des Puys (stricto sensu). The results are used to discuss the influence of these specific differentiation conditions involving large H2O contents in primary melts likely contributing to the particularly high explosivity of the Pavin eruption which produced benmoreitic to trachytic magmas.

The particular features of the Pavin group within the Chaîne des Puys volcanic system, namely, the southernmost position, the younger age, the specific magmatic evolution from the most primary basalt ever erupted in Chaîne des Puys, coupled with a short activity duration (~400 years) justify a renewal of petrological and geochemical interest for these volcanoes.

Keywords

France Massif Central Chaîne des Puys Lake Pavin Geochemistry Trace elements Magmatology 

Notes

Acknowledgments

We thank G. Grassi for her participation in preliminary analyzes. One of us (BV) is particularly grateful to the late P. Vincent and his student JL. Bourdier for their initiation, 35 years ago, to the tephrostratigraphy of Pavin eruptions. We thank C. Martel and I. Vlastelic for their constructive reviews.

References

  1. Blundy J, Wood BJ (2003) Partitioning of trace elements between crystals and melts. Earth Planet Sci Lett 210:383–397CrossRefGoogle Scholar
  2. Bourdier JL (1980) Contribution à l’étude volcanologique de deux secteurs d’intérêt géothermique dans le Mont Dore : le groupe holocène du pavin et le Massif du Sancy. Thesis, University Blaise Pascal, Clermont-Ferrand II,185 pGoogle Scholar
  3. Foury P (1983) Etudes pétrologiques et expérimentales (à une atmosphère) d’une série alcaline continentale de la Chaîne des Puys (M.C.F.). Thesis, University Blaise Pascal, Clermont-Ferrand II,150 pGoogle Scholar
  4. Jannot S, Schiano P, Boivin P (2005) Melt inclusions in scoria and associated mantle xenoliths of Puy Beaunit Volcano, Chaine des Puys, Massif Central, France. Contrib Mineral Petrol 149:600–612. doi: 10.1007/s00410-005-0670-y CrossRefGoogle Scholar
  5. Lemarchand F, Villemant B, Calas G (1987) Trace element distribution coefficients in alkaline series. Geochim Cosmochim Acta 51:1071–1081CrossRefGoogle Scholar
  6. Martel C, Champallier M, Prouteau G, Pichavant M, Arbaret L, Balcone-Boissard H, Boudon G, Boivin P, Bourdier JL, Scaillet B (2013) Trachyte phase relations and implication for magma storage conditions in the Chaîne des Puys (French Massif Central). J Petrol 54(6):1071–1107. doi: 10.1093/petrology/egt006 CrossRefGoogle Scholar
  7. Maury R, Brousse R, Villemant B, Jaffrezic H, Joron JL, Treuil M (1980) Cristallisation fractionnée d’un magma basaltique alcalin: la série de la Chaîne des Puys (Massif Central, France). I Minéralogie et Pétrologie. Bull Minéral 103:250–266Google Scholar
  8. Villemant B, Joron JL, Treuil M (1979) Origine des Quartz des nappes de ponces du Mont Dore (Massif Central, France) : arguments géochimiques. C R Acad Sci Paris 290(D):687–690Google Scholar
  9. Villemant B, Joron JL, Jaffrezic H, Treuil M, Maury R, Brousse R (1980) Cristallisation fractionnée d’un magma basaltique alcalin: la série de la Chaîne des Puys (Massif Central, France). II Géochimie. Bull Minéral 103:267–286Google Scholar
  10. Villemant B, Jaffrezic H, Joron JL, Treuil M (1981) Distribution coefficients of major and trace elements; fractional cristallization in the alkali basalt series of Chaîne des Puys (Massif Central, France). Geochim Cosmochim Acta 45:1997–2016CrossRefGoogle Scholar
  11. Wright TL, Doherty PC (1970) A linear programming and least squares computer method for solving petrologic mixing problems. Geol Soc Am Bull 81:1995–2008CrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Benoît Villemant
    • 1
  • Benoît Caron
    • 1
  • Pauline Thierry
    • 1
  • Pierre Boivin
    • 2
  1. 1.Laboratoire de Pétrologie, Géochimie et Minéralogie MagmatiquesSorbonne Universités, UPMC Univ Paris 06, CNRS, Institut des Sciences de la Terre de Paris (iSTeP)Cedex 05 ParisFrance
  2. 2.LMVUniversité Clermont-Auvergne - CNRS - IRD - OPGCAubièreFrance

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