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Composition of monazites from pegmatites in eastern Minas Gerais, Brazil

Geochimica et Cosmochimica Acta
By: , 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
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