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Composition of monazites from pegmatites in eastern Minas Gerais, Brazil

January 1, 1959

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.

Publication Year 1959
Title Composition of monazites from pegmatites in eastern Minas Gerais, Brazil
DOI 10.1016/0016-7037(59)90043-2
Authors K. J. Murata, C. V. Dutra, M.T. da Costa, J.J.R. Branco
Publication Type Article
Publication Subtype Journal Article
Series Title Geochimica et Cosmochimica Acta
Index ID 70010776
Record Source USGS Publications Warehouse