Mathematics – Logic
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.4191a&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 12, p. 4191-4204.
Mathematics
Logic
5
Abundance, Chondrites, Fractionation, Lava, Olivine, Rare Earth Elements, Trace Elements, Aluminum Oxides, Geological Surveys, Nickel, Titanium Oxides
Scientific paper
Results are presented of trace element analyses in spinifex and in cumulate samples from a thick komatiite lava flow from Kambalda (western Australia). Results showed unexpectedly large variations of the relative abundances of heavy REE in spinifex lavas and olivine cumulates. It is proposed that the variations may be attributed to olivine fractionation. This hypothesis is supported by the analyses of trace elements in olivine separated from an olivine cumulate, which also show that the values of the partition coefficients for compatible elements (Sc, V, Cr, and Ni) are smaller for komatiite than for basalt. The origin of these rocks is discussed on the basis of this finding, together with a knowledge of the overall chemical characteristics of komatiites.
Arndt Nicholas T.
Lesher Michael C.
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