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Monazite-(Ce)-huttonite solid solutions in granulite-facies metabasites from the Ivrea-Verbano Zone, Italy

Published online by Cambridge University Press:  05 July 2018

H.-J. Förster  and
D. E. Harlov
H.-J. Förster
Affiliation:
GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany
D. E. Harlov
Affiliation:
GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany
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Abstract

Composite populations of monazite-group minerals of both metamorphic and metasomatic origin have been discovered in thin layers of granulite-facies metabasites interlayered with metapelites, located in the Val Strona di Omegna region of the Ivrea-Verbano Zone, Italy. In addition to monazite-(Ce), which is uncommonly poor in Th and is probably formed by incongruent dissolution of apatite, these populations include members of the monazite-huttonite series. The latter minerals contain between 13 and 30.1 mol.% ThSiO4 [= huttonitic monazite-(Ce)], and are known from only half a dozen other occurrences worldwide. We propose that breakdown of primary monazite-(Ce) in the metapelites during granulite-facies metamorphism mobilized Th and the REEs, which were then transported by high-grade metamorphic fluids into the metabasite layers to form the Th-rich minerals of the monazite-huttonite series.

Keywords

monazitehuttoniteapatitecrystal-chemistrygranulite-facies metamorphismmetabasiteIvrea-Verbano Zone
Type
Letters
Information
Mineralogical Magazine , Volume 63 , Issue 4 , August 1999 , pp. 587 - 594
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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