Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1345w&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 6, pp.1345-1348
Physics
6
Scientific paper
Variation in Nb / Ta ratio through a suite of phonolitic volcanics is
reported. Sphene, a phenocryst mineral, shows preferential incorporation
of Ta relative to Mb, consistent with the bulk rock variation, where Nb
/ Ta increases with fractionation. Nb in these magmas may be partly
present in the Nb 3+ state.
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