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Composition of monazites from pegmatites in eastern Minas Gerais, Brazil

Geochimica et Cosmochimica Acta

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, , , and

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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. ?? 1959.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Composition of monazites from pegmatites in eastern Minas Gerais, Brazil
Series title:
Geochimica et Cosmochimica Acta
Volume
16
Issue:
1-3
Year Published:
1959
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geochimica et Cosmochimica Acta
First page:
1
Last page:
14