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Geologic Characteristics and Genetic Problems Associated with the Development of Granite-Hosted Deposits of Tantalum and Niobium

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Lanthanides, Tantalum and Niobium

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

Abstract

Granite-hosted deposits of tantalum and niobium form massive or sheetlike zones of disseminated mineralization in the upper portions of some geochemically specialized granite plutons. Such mineralization usually reaches a maximum in association with albite and fluorite (±lithium)-rich zones in small, late-stage intrusions. These zones are formed in some cases by crystallization of fluorine-rich magmas, and in other cases may result from postmagmatic alteration.

The detailed textural and timing information required to assess the influence of magmatic and postmagmatic processes in the development of these deposits is lacking in many cases. Two major genetic models for mineralization envisage metal accumulation to result either from enrichment within the upper portion of a zoned magma chamber at the magmatic stage, or by leaching from lower levels of the granite with precipitation in the upper levels at the postmagmatic stage. Further detailed mineralogical, textural, geochemical and isotopic studies are required before the relative importance of these alternatives can be fully assessed.

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© 1989 Springer-Verlag Berlin Heidelberg

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Pollard, P.J. (1989). Geologic Characteristics and Genetic Problems Associated with the Development of Granite-Hosted Deposits of Tantalum and Niobium. In: Möller, P., Černý, P., Saupé, F. (eds) Lanthanides, Tantalum and Niobium. Special Publication No. 7 of the Society for Geology Applied to Mineral Deposits, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87262-4_9

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  • DOI: https://doi.org/10.1007/978-3-642-87262-4_9

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-87264-8

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