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American Mineralogist; January; v. 94; no. 1; p. 176-180; DOI: 10.2138/am.2009.2984
© 2009 Mineralogical Society of America
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The composition of KLB-1 peridotite

Fred A. Davis1,*, Jean A. Tangeman2, Travis J. Tenner1 and Marc M. Hirschmann1

1 Department of Geology and Geophysics, University of Minnesota, 108 Pillsbury Hall, Minneapolis, Minnesota 55455 U.S.A.
2 Corporate Research Materials Laboratory, 3M Company, Building 201-4N-01 St. Paul, Minnesota 55144-1000, U.S.A.

Correspondence: * E-mail: davis957{at}umn.edu

Electron microprobe analyses of major- and 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 com-position 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.

Key Words: Peridotite • KLB-1 • microprobe • mantle • levitating/laser fusion






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