REE(Y), Nb, and Ta Enrichment in Pegmatites and Carbonatite-Alkalic Rock Complexes

  • P. Möller
Part of the Special Publication No. 7 of the Society for Geology Applied to Mineral Deposits book series (MINERAL DEPOS., volume 7)

Abstract

Under favourable conditions REE(Y) and Ta(Nb) are enriched in complex granitic pegmatites but not both in the same body. The two groups of elements follow different fractionation trends. In alkalic rock-carbonatite complexes, however, REE(Y) and Nb(Ta) are always concentrated together. This geochemical coherence is remarkable because REE(Y) are expected to act as cations, whereas Ta and Nb form nuclei of complex anions. Both element suites are considered as “incompatible”, but their degree of incompatability differs. REE(Y) substitute for Ca, Fe and to some degree Mg in common rock-forming minerals and, as a result, are widely distributed. The anionic species of Ta and Nb do not substitute for \(SiO_4^{4 - }\) in silicates. Ta and Nb commonly substitute for Ti, Zr, W and Sn. The enrichment of REE(Y), Nb and Ta is closely linked with the petrogenesis of pegmatites, carbonatites and alkalic rocks.

Keywords

Crystallization Geochemistry Assimilation Perovskite Fluorine 

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© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • P. Möller
    • 1
  1. 1.Hahn-Meitner-Institut Berlin GmbH, AG GeochemieBerlin 30Germany

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