Contributions to Mineralogy and Petrology

, Volume 162, Issue 5, pp 995–1009 | Cite as

Insights into the origin of primitive silica-undersaturated arc magmas of Aoba volcano (Vanuatu arc)

  • Fanny SorbadereEmail author
  • Pierre Schiano
  • Nicole Métrich
  • Esline Garaebiti
Original Paper


Aoba picrites in Vanuatu arc (Southwestern Pacific) offer the opportunity to address the question of the origin of Si-undersaturated arc magmas, through the geochemical study of their olivine-hosted melt inclusions. These latter delineate a differentiation trend of calc-alkaline silica-undersaturated basalts, with typical trace-element patterns of arc magmas. The most primitive melt inclusions, preserved in olivines with Fo ≥ 89, have normative nepheline compositions with CaO/Al2O3 > 0.8, but belong to three distinct populations differing in their enrichment or depletion in LILE, Cl, and alkalis (Rb, K). The dominant population is characterized by medium-LILE concentrations (La/Yb ~ 7–8) and represents the parental magma of the Aoba lavas. The two others (La/Yb ~ 20 and 2) are either significantly enriched or extremely depleted in LILE, Cl, and alkalis. This compositional variability of primitive magma batches requires the multi-stage mixing between melts generated by partial melting of both peridotite and clinopyroxene-rich lithologies. Medium-LILE magma derives from the mixing between peridotite- and clinopyroxenite-derived melts, whereas the high- and low-LILE melts involve amphibole-bearing and amphibole-free clinopyroxenite sources, respectively.


Picrite Vanuatu arc Aoba Island Si-undersaturated melts Melt inclusions 



We are grateful to Ph. Bani and A. Bertagnini for their kind help in sample collection, J-L Devidal for microprobe and LA-ICP-MS analyses, M. Mercier for Raman spectroscopy analyses, M. le Voyer and C. Dalou for personal communications. Two anonymous reviews greatly improved our manuscript. This work was supported by the ANR contracts ANR-06-CATT-02 Arc-Vanuatu.

Supplementary material

410_2011_636_MOESM1_ESM.xls (108 kb)
Supplementary material 1 (XLS 108 kb)


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Fanny Sorbadere
    • 1
    • 2
    Email author
  • Pierre Schiano
    • 1
    • 2
  • Nicole Métrich
    • 3
  • Esline Garaebiti
    • 4
  1. 1.Clermont Université, Université Blaise Pascal, Laboratoire Magmas et VolcansClermont-FerrandFrance
  2. 2.CNRS, UMR 6524 and IRDClermont-FerrandFrance
  3. 3.Institut de Physique du Globe, UMR CNRS 7154, Sorbonne Paris-CitéUniversité Paris DiderotParis cedex 05France
  4. 4.Department of Meteorology and GeohazardsPort VilaVanuatu

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