Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.110..227l&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 110, no. 1-4, May 1992, p. 227-244. Research supported by NASA.
Physics
49
Basalt, Fractionation, Geochemistry, Pyroxenes, Thorium, Uranium, Crystallization, Magma, Thermochemistry
Scientific paper
Experimental measurements of U and the partition coefficients between clinopyroxene and synthetic and natural basaltic liquid are presented. The results demonstrate that crystal-liquid U-Th fractionation is fO2-dependent and that U in terrestrial magmas is not entirely tetravalent. During partial melting, the liquid will have a Th/U ratio less than the clinopyroxene in the source. The observed U-238 - Th-230 disequilibrium in MORB requires that the partial melt should have a U/Th ratio greater than the bulk source and therefore cannot result from clinopyroxene-liquid partitioning. Further, the magnitudes of the measured partition coefficients are too small to generate significant U-Th fractionation in either direction. Assuming that clinopyroxene contains the bulk of the U and Th in the MORB source, the results indicate that U-238 - Th-230 disequilibrium in MORB may not be caused by partial melting at all.
Burnett Don S.
Latourrette T. Z.
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