Effects of partial melting on the uranium decay series

Details Effects of partial melting on the uranium decay series Effects of partial melting on the uranium decay series

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1607w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 7, pp.1607-1619

Computer Science

41

Scientific paper

Distinction between possible partial melting processes using stable incompatible trace elements depends largely on the mass fraction of liquid produced. At low degrees of melting (less than 5%), both incompatible element concentrations and interelement fractionations are greater for batch, fractional and accumulated fractional melting than for dynamic or continuous melting. At higher degrees of melting, uncertainty in initial source composition and small fractionations between incompatible elements make it unlikely that the most realistic melting models, batch and dynamic, could be discriminated. However, it is possible for these melting processes to be distinguished by the magnitude of radioactive disequilibria that is produced within the 238 U decay series. Even for durations of partial melting much longer than the half-lives of 230 Th and 226 Ra, both 230 Th- 238 U and 226 Ra- 230 Th disequilibria can occur because of differences in the bulk solid/liquid partition coefficients for these elements. The magnitude of these disequilibria depends on melting process. The ( 230 Th )/( 232 Th ) of a dynamic melt can differ significantly from that of a batch melt, and will not necessarily indicate the original ( 238 U )/( 232 Th ) of the source. If MORB is formed by a dynamic melting process, then the Th/U of the upper mantle near ridge axes may be higher than that calculated from the ( 230 Th )/( 232 Th ) of the basalts.

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