Computer Science
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51...55g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 51, Issue 1, pp.55-62
Computer Science
49
Scientific paper
Experimental determination of partition coefficients ( D ) for Nb and Ta between Ti-rich minerals (sphene, rutile, ilmenite and Ti-magnetite) and coexisting silicate liquids of basaltic andesite, andesite and trachyte composition, indicate that these elements partition strongly into sphene and rutile, and moderately into ilmenite and Ti-magnetite. The D values for sphene increase with decreasing temperature and with increasing SiO 2 content of the coexisting liquid, but appear unchanged by pressure between 7.5 and 16 kb, and oxygen fugacity between magnetite-wustite and haematite-magnetite buffers. Also, D Nb / D Ta . varies from 0.3-0.4 for sphene, increasing to 0.6-0.7 for rutile, 0.7-0.8 for ilmenite and 0.8 for Ti-magnetite. Thus fractionation involving these minerals may cause an increase in the Nb / Ta ratio of any derivative liquid; this will be most noticeable where sphene is involved.
Green Trevor H.
Pearson Norm J.
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