New experimental determination of Li and B partition coefficients during upper mantle partial melting (Articolo in rivista)

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  • New experimental determination of Li and B partition coefficients during upper mantle partial melting (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1007/s00410-008-0336-7 (literal)
Alternative label
  • Ottolini L.; Laporte D.; Raffone N.; Devidal J.; Le Fevre B. (2009)
    New experimental determination of Li and B partition coefficients during upper mantle partial melting
    in Contributions to mineralogy and petrology; SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ottolini L.; Laporte D.; Raffone N.; Devidal J.; Le Fevre B. (literal)
Pagina inizio
  • 313 (literal)
Pagina fine
  • 325 (literal)
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  • 157 (literal)
Rivista
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  • In: Contributions to Mineralogy and Petrology, vol. 157 (3) pp. 313 - 325. Springer, 2009. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 3 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Ottolini L. 1); Laporte D. 2),3); Raffone N. 1); Devidal J. 2),3); Le Fevre B. 1). 1) CNR-IGG, Sezione di Pavia, Pavia, Italy; 2) Laboratoire Magmas et Volcans, CNRS, Clermont-Ferrand Cedex, France; 3) Universite┬┤ Blaise Pascal, OPGC, Clermont-Ferrand Cedex, France. (literal)
Titolo
  • New experimental determination of Li and B partition coefficients during upper mantle partial melting (literal)
Abstract
  • Despite the growing interest for Li and B as geochemical tracers, especially for material transfer from subducting slabs to overlying peridotites, little is known about the behaviour of these two elements during partial melting of mantle sources. In particular, mineral/melt partition coefficients for B and to a lesser extent Li are still a matter of debate. In this work, we re-equilibrated a synthetic basalt doped with similar to 10 ppm B and similar to 6 ppm Li with an olivine powder from a spinel lherzolite xenolith at 1 GPa-1,330A degrees C, and we analyzed Li and B in the run products by secondary ion mass spectrometry (SIMS). In our experiment, B behaved as a highly incompatible element with mineral/melt partition coefficients of the order of 10(-2) (D (ol/melt) = 0.008 (0.004-0.013); D (opx/melt) = 0.024 (0.015-0.033); D (cpx/melt) = 0.041 (0.021-0.061)), and Li as a moderately incompatible element (D (ol/melt) = 0.427 (0.418-0.436); D (opx/melt) = 0.211 (0.167-0.256); D (cpx/melt) = 0.246 (0.229-0.264)). Our partition coefficients for Li are in good agreement with previous determinations. In the case of B, our partition coefficients are equal within error to those reported by Brenan et al. (1998) for all the mineral phases analyzed, but are lower than other coefficients from literature for some of the phases (up to 5 times for cpx). Our measurements complement the data set of Ds for modelling partial melting of the upper mantle and basalt generation, and confirm that, in this context, B is more incompatible than previously anticipated. (literal)
  • In: Highlights CNR 2008-2009 (in Italiano)/ In: Highlights CNR 2009-2010 (in Inglese)/ TITOLO: A way to track mantle heterogeneity------------------- The terrestrial mantle is chemically heterogeneous, and the nature and scale of this heterogeneity are of primary importance to understand the evolution of the Earth. A way to track such heterogeneity is to analyze the basalts produced by the mantle partial melting in the different tectonic contexts. The studies rely on the division between \"compatible\" elements (that have the tendency to remain in the minerals of the residual rock) and \"incompatible\" ones (that have a preference for the melt). The modelling relies on the degree to which these elements remain in the solid and the used parameter is the mineral/melt \"partition coefficient\". The nowadays available data on the partitioning of lithium (Li) and boron (B) for the upper mantle show a relatively large scatter. The research carried out within the European project EUROMELT (HPRN-CT-2002 -00211) has allowed to improve the experimental and analytical techniques for the determination of the very low (ppb-ppm) contents of Li and B in the mantle minerals (olivine and pyroxene) and in the basaltic melt. The experiment, performed at a pressure of 1 GPa and a temperature of 1330┬░C, at the Lab. Magmas et Volcans (Clermont-Ferrand) produced the equilibrium between a synthetic basalt and an olivine powder from a spinel lherzolite xenolite. Lithium and boron were analyzed in the run products by means of the Cameca IMS 4F ion microprobe installed at the Secondary Ion Mass Spectrometry (SIMS) Lab. of the CNR-Institute of Geosciences and Earth Resources (IGG), Section of Pavia. The SIMS methodological development allowed to get accurate measurements of Li and B in the minerals and in the melt, besides in the mineral phases of the starting xenolite. Li resulted to be moderately incompatible, and B much more incompatible than generally known from literature. (literal)
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