Partial melting of garnet lherzolite with water and carbon dioxide at 3 GPa using a new melt extraction technique: implications for intraplate magmatism

  • Amrei Baasner
  • Etienne Médard
  • Didier Laporte
  • Géraldine Hoffer
Original Paper

Abstract

The origin and source rocks of alkali-rich and SiO2-undersatured magmas in the Earth’s upper mantle are still under debate. The garnet signature in rare earth element patterns of such magmas suggests a garnet-bearing source rock, which could be garnet lherzolite or garnet pyroxenite. Partial melting experiments were performed at 2.8 GPa and 1345–1445 °C in a piston-cylinder using mixtures of natural lherzolite with either 0.4 wt% H2O and 0.4 wt% CO2 or 0.7 wt% H2O and 0.7 wt% CO2. Different designs of AuPd capsules were used for melt extraction. The most successful design included a pentagonally shaped disc placed in the top part of the capsule for sufficient melt extraction. The degrees of partial melting range from 0.2 to 0.04 and decrease with decreasing temperature and volatile content. All samples contain olivine and orthopyroxene. The amounts of garnet and clinopyroxene decrease with increasing degree of partial melting until both minerals disappear from the residue. Depending on the capsule design, the melts quenched to a mixture of quench crystals and residual glass or to glass, allowing measurement of the volatile concentrations by Raman spectroscopy. The compositions of the partial melts range from basalts through picrobasalts to foidites. Compared to literature data for melting of dry lherzolites, the presence of H2O and CO2 reduces the SiO2 concentration and increases the MgO concentration of partial melts, but it has no observable effect on the enrichment of Na2O in the partial melts. The partial melts have compositions similar to natural melilitites from intraplate settings, which shows that SiO2-undersaturated intraplate magmas can be generated by melting of garnet lherzolite in the Earth’s upper mantle in the presence of H2O and CO2.

Keywords

Mantle Garnet lherzolite Partial melting Intraplate setting Carbon dioxide Water 

Notes

Acknowledgments

This research was financed by the French Government Laboratory of Excellence initiative no. ANR-10-LABX-0006, the Région Auvergne, the European Regional Development Fund, the Syster program of CNRS-INSU, and the Agence Nationale de la Recherche (ELECTROLITH Project, Contract No. ANR-2010-BLAN-621). This is Laboratory of Excellence ClerVolc contribution number 196. We thank Dr. Burkhard Schmidt and the Department for Experimental and Applied Mineralogy at Georg-August-University Göttingen for granting us access to their Raman spectrometer. The original design of the cold-sealed, thick-walled capsules (without the inner disc to extract partial melt) was provided to us by Dr. R. P. Rapp. We thank Claire Fonquernie at LMV for the NHCS analyses. We thank Greg Van den Bleeken, Pierre Condamine, Manon Hardiagon, Maxime Mercier and Nathalie Bolfan-Casanova for their support in the laboratory. In addition, we thank the two anonymous reviewers for their constructive comments.

Supplementary material

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Supplementary material 1 (DOC 415 kb)
410_2016_1233_MOESM2_ESM.xlsx (35 kb)
Supplementary material 2 (XLSX 35 kb)
410_2016_1233_MOESM3_ESM.docx (19 kb)
Supplementary material 3 (DOCX 18 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Amrei Baasner
    • 1
  • Etienne Médard
    • 1
  • Didier Laporte
    • 1
  • Géraldine Hoffer
    • 1
    • 2
  1. 1.Laboratoire Magmas et VolcansUniversité Blaise Pascal – CNRS – IRD, OPGCAubiereFrance
  2. 2.QuitoEcuador

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