Experimental Investigation of the Effect of Cooling Rate on Melilite/Liquid Distribution Coefficients for Sr, Ba, and TI in Type B Refractory Inclusion Melts

Details Experimental Investigation of the Effect of Cooling Rate on Melilite/Liquid Distribution Coefficients for Sr, Ba, and TI in Type B Refractory Inclusion Melts Experimental Investigation of the Effect of Cooling Rate on Melilite/Liquid Distribution Coefficients for Sr, Ba, and TI in Type B Refractory Inclusion Melts

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1201s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1201

Physics

3

Barium, Inclusions: Refractory, Melilite, Partition Coefficients, Strontium, Titanium

Scientific paper

It is well established that Type B1 refractory inclusions were once at least partially molten. These inclusions are thought to represent closed magmatic systems, but attempts to model the trace element contents in melilite in these CAIs have not met with much success. Observed abundances of most trace elements tend to be significantly higher than those predicted using equilibrium melilite/liquid distribution coefficients. Boundary layers have been proposed as an explanation, but in the case of Sr, its D of ~0.8 is too high to give rise to boundary layers sufficiently enriched in Sr to account for the observed enrichments. We have investigated the possibility that Ds increase with increasing cooling rate. We found that Ds for Ti, Sr and Ba are virtually invariant with akermanite and with cooling rate, and the models still do not fit the observations, especially for Ba, which is off by a factor of ~20. The results indicate that a process occurred during the crystallization of melilite that we have yet to understand. _

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