Experimental determination of F and Cl partitioning between lherzolite and basaltic melt

Célia Dalou, Kenneth T. Koga, Nobumichi Shimizu, Julien Boulon, Jean Luc Devidal

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105 Scopus citations

Abstract

We experimentally determined F and Cl partition coefficients together with that of 19 trace elements (including REE, U-Th, HFSE and LILE) between basaltic melt and lherzolite minerals: olivine, orthopyroxene, clinopyroxene, plagioclase and garnet. Under conditions from 8 to 25 kbars and from 1,265 to 1,430°C, compatibilities of F and Cl are globally ordered as D Cpx/melt > D Opx/melt > D Grt/melt > D Ol/melt > D Plag/melt, and D F mineral/melt is larger than D Cl mineral/melt. Four other major results were brought to light. (1) Chlorine partition coefficients positively correlate with the jadeite component in orthopyroxene, and increase of the CaTs component promotes Cl incorporation in clinopyroxene. (2) Variations of fluorine partition coefficients correlate strongly with melt viscosity. (3) F and Cl partition coefficients correlate with the Young's modulus (E 0) of pyroxene octahedral sites (M sites) and with Raman vibrational modes of pyroxenes. This demonstrates a fundamental interaction between the M site of pyroxenes and the incorporation of F and Cl. (4) We also determined the parameters of the lattice-strain model applied to 3+ cation trace elements for the two M sites in orthopyroxene and clinopyroxene: D 0 M1, D 0 M2, r 0 M1, r 0 M2, E 0 M1 and E 0 M2.

Original languageEnglish (US)
Pages (from-to)591-609
Number of pages19
JournalContributions to Mineralogy and Petrology
Volume163
Issue number4
DOIs
StatePublished - Apr 2012

Bibliographical note

Funding Information:
Acknowledgments The authors would like to thank P. Wallace and an anonymous reviewer for their thoughtful and critical comments that significantly improved the manuscript, and T. L. Grove for editorial handling. We are also grateful to E. Médard, E. Rose-Koga and M. LeVoyer for helpful discussion on this study. We thank S. Lam-bart and F. Pointud for their help during piston-cylinder experiments. We also thank N. Chatterjee and B. Boyer for their help on the electron microprobe and the SIMS, respectively. CD thanks R. Dennen and E. Rose-Koga for their assistance with English revisions. CD and KK thank D. Andrault for his support on this thesis research. This project was financed by the Agence Nationale de la Recherche of France (grant no. ANR-NT09-454454), and by French CNRS Institut National des Sciences de l’Univers (SEDIT 2008).

Keywords

  • Basaltic melt
  • Chlorine
  • Fluorine
  • Lattice-strain model
  • Lherzolite minerals
  • Partition coefficients
  • Substitution

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