Other
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000e%26psl.178..285d&link_type=abstract
Earth and Planetary Science Letters, Volume 178, Issue 3-4, p. 285-301.
Other
19
Scientific paper
In order to evaluate the widely accepted assumption that Zr/Hf ratios are uniform and chondritic (i.e. equal to 36.6) in terrestrial rocks [Jochum et al., Geochim. Cosmochim. Acta 50 (1986) 1173-1183], precise Zr/Hf measurements on oceanic basalts, continental materials and chondrites have been obtained by isotope dilution technique using thermal ionisation mass spectrometry and magnetic sector-multiple collector ICP-MS. The results indicate that Zr/Hf ratio may substantially fractionate during petrogenetic processes. A well-defined negative correlation observed between Sc concentrations and Zr/Hf ratios indicates that during fractional crystallisation, the latter are controlled by the precipitation of clinopyroxene. Although clinopyroxene is the major phenocryst phase, minor mineral phases such as sphene and amphibole must be taken into account to explain the fractionation of highly evolved alkaline suites. On the other hand, the comparison between mid-ocean ridge basalts (MORB) and oceanic island basalts (OIB) suggests that DZr
Allègre Claude J.
David Karine
Schiano Pierre
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