The composition of KLB-1 peridotite

Fred A Davis, Jean A. Tangeman, Travis J. Tenner, Marc M Hirschmann

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Electron microprobe analyses of majorand minor-element oxide components for two glassed samples of natural KLB-1 peridotite are presented. One glass was made with the aid of a phosphate flux, and the second glass was made by laser melting of aerodynamically levitated spheroids resulting in homogeneous silicate glass beads. For unknown reasons, the silicate-phosphate glass yields compositions that are incompatible with the composition of KLB-1 peridotite. However, analysis of the glass bead formed by laser synthesis is believed to give an accurate representation of the composition of KLB-1 peridotite, except for minor loss of Na2O owing to volatilization. The new data resolve conflicting FeO, CaO, and TiO2 values from two older measurements present in the literature. Mass-balance calculations using the new composition measurement combined with new analyses of the mineral compositions in KLB-1 result in a lower sum of squares of the residuals than those using the older measurements. There are appreciable differences in calculated modes from partial-melting experiments of KLB-1 when calculated using older KLB-1 analyses or our new analysis.

Original languageEnglish (US)
Pages (from-to)176-180
Number of pages5
JournalAmerican Mineralogist
Volume94
Issue number1
DOIs
StatePublished - Jan 1 2009

Keywords

  • KLB-1
  • Levitating/laser fusion
  • Mantle
  • Microprobe
  • Peridotite

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