Composition of monazites from pegmatites in eastern Minas Gerais, Brazil
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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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Composition of monazites from pegmatites in eastern Minas Gerais, Brazil |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(59)90043-2 |
| Volume | 16 |
| Issue | 1-3 |
| Year Published | 1959 |
| Language | English |
| Publisher | Elsevier |
| Description | 14 p. |
| First page | 1 |
| Last page | 14 |
| Country | Brazil |
| State | Minas Gerais |
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