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Grandidierite from a pelitic xenolith in the Haddo House complex, NE Scotland

Published online by Cambridge University Press:  05 July 2018

R. K. Hero ,
B. F. Windley  and
D. Ackermand
R. K. Hero
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A OE8, Canada
B. F. Windley
Affiliation:
Department of Geology, The University, Leicester LE1 7RH, United Kingdom
D. Ackermand
Affiliation:
Mineralogisches Institut der Universitäit, D-2300 Kid, Federal Republic of Germany
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Abstract

Grandidierite occurs in the outer margin of a biotite-rich pelitic xenolith in norite close to the contact of a tourmaline-bearing granite in the Haddo House norite-gabbro complex. The boron for the grandidierite was derived by metasomatism from the granite. The assemblage is (decreasing order): An55–51 plagioclase (65%), biotite (10%), spinel (10%), cordierite (5%), corundum (5%), ilmenite, grandidierite (< 1%), rutile, sphene, zircon. XMg range is grandidierite (0.80–0.78) > cordierite (0.78) > biotite (c. 0.59) > spinel (0.35–0.27). The grandidierite has little chemical variation: SiO2, 19.9–20.5%; Al2O3, 51.3–51.9%. A compilation of all grandidierite analyses in the literature shows that the only substitutions are Fe2+ ⇌ Mg and Al ⇌ Fe3+, the XMg range being 0.98 to 0.19.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 348 , September 1984 , pp. 401 - 406
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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