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Gahnite and columbite in an alkali-feldspar granite from New Zealand

Published online by Cambridge University Press:  05 July 2018

A. J. Tulloch
A. J. Tulloch*
Affiliation:
Geology Department, Otago University, Dunedin, New Zealand*
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Abstract

Gahnite and columbite with compositions (Zn5.96Fe1.55Mg0.21Mn0.13)Σ7.85Al16.09O32 and (Nb7.36Ta0.60Mn2.95Fe0.98Ti0.09)Σ11.98O24 occur as accessory phases in a highly evolved garnetiferous muscovite alkalifeldspar granite. Both phases have developed as a result of a concentration of Zn, Nb, and Ta during the fmal stages of the fractional crystallization which led to the formation of the pluton, and the lack of a major mafic mineral such as biotite, in which these elements are normally camouflaged in granitoid rocks.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 335 , September 1981 , pp. 275 - 278
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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Footnotes

*

Present address: NZ Geological Survey, PO Box 30368, Lower Hutt, New Zealand.

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