Computer Science
Scientific paper
May 1959
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1959gecoa..16....1m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 16, Issue 1-3, pp.1-14
Computer Science
5
Scientific paper
Two zoned pegmatites in south-eastern Minas Gerais were sampled in detail for their content of monazite and xenotime and the monazite was analysed for certain of the rare-earth elements and thorium. The ratio of xenotime to monazite increases in both pegmatites from the wall toward the quartz core. The content of the less basic rare-earth elements and of thorium in monazite rises in the same direction. These variation trends suggest that during the crystallization of these pegmatites there was a fractionation of the elements leading to a more or less steady enrichment of the less basic rare-earth elements and of thorium in the residual fluids. One mode of explaining these observed effects postulates that the rare-earth elements and thorium were present in pegmatitic fluids as co-ordination complexes rather than as simple cations.
Branco J. R. J.
Dutra C. V.
Murata K. J.
Teixeira da Costa M.
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