| Abstract: | 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. ?? 1959. |
| Genre: | Article |
| ProdID: | 70010776 |
| Citation Author: | Murata, K. J.; Dutra, C. V.; da, Costa, M. T.; Branco, J. J. R. |
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| Citation End Page: | 14 |
| Citation Issue: | 1-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Composition of monazites from pegmatites in eastern Minas Gerais, Brazil; 1959; Article; Journal; Geochimica et Cosmochimica Acta; Murata, K. J.; Dutra, C. V.; da, Costa, M. T.; Branco, J. J. R. |
| Citation Start Page: | 1 |
| Citation Volume: | 16 |
| Citation Year: | 1959 |
| Type: | citation/reference |
| Text: | Composition of monazites from pegmatites in eastern Minas Gerais, Brazil; 1959; Article; Journal; Geochimica et Cosmochimica Acta; Murata, K. J.; Dutra, C. V.; da, Costa, M. T.; Branco, J. J. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1959 00:00 -0600 |
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