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Boron-bearing kornerupine from Fiskemesset, West Greenland: a re-examination of specimens from the type locality

Published online by Cambridge University Press:  05 July 2018

Edward S. Grew ,
Richard K. Herd  and
Nicholas Marquez
Edward S. Grew
Affiliation:
Department of Geological Sciences, 110 Boardman Hall, University of Maine, Orono, Maine 04469, U.S.A.
Richard K. Herd
Affiliation:
Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
Nicholas Marquez
Affiliation:
Materials Analysis Department, Aerospace Corporation, Los Angeles, California 90009, U.S.A.
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Abstract

In 1884, Lorenzen proposed the formula MgAl2SiO6 for his new mineral kornerupine from Fiskenæsset and did not suspect it to contain boron. Lacroix and de Gramont (1919) reported boron in Fiskenæsset kornerupine, while Herd (1973) found none. New analyses (ion microprobe mass analyser and spectrophotometric) of kornerupine in three specimens from the type locality, including the specimens analysed by Lorenzen and Herd, indicate the presence of boron in all three, in amounts ranging from 0.50 to 1.44 wt.% B2O3, e.g. (Li0.04 Na0.01 Ca0.01) (Mg3.49 Mn0.01 Fe0.17 Ti0.01 Al5.64)Σ9.30 (Si3.67 Al1.02 B0.31)Σ5 O21 (OH0.99 F0.01) for Lorenzen's specimen. Textures and chemical compositions suggest that kornerupine crystallized in equilibrium in the following assemblages, all with anorthite (An 92–95) and phlogopite (XFe = atomic Fe/(Fe + Mg) = 0.028–0.035): (1) kornerupine (0.045)-gedrite (0.067); (2) kornerupine (0.038–0.050)-sapphirine (0.032–0.035); and (3) kornerupine (0.050)-hornblende. Fluorine contents of kornerupine range from 0.01 to 0.06%, of phlogopite, from 0.09 to 0.10%. In the first assemblage, sapphirine (0.040) and corundum are enclosed in radiating bundles of kornerupine; additionally sapphirine, corundum, and/or gedrite occur with chlorite and pinite (cordierite?) as breakdown products of kornerupine. Kornerupine may have formed by reactions such as: gedrite + sapphirine + corundum + B2O3 (in solution) + H2O = kornerupine + anorthite + Na-phlogopite under conditions of the granulite facies. Boron for kornerupine formation was most likely remobilized by hydrous fluids from metasedimentary rocks occurring along the upper contact of the Fiske⇒set gabbro-anorthosite complex with amphibolite.

Keywords

boronkornerupineFiskenæssetGreenlandion microprobespectrophotometry
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 363 , December 1987 , pp. 695 - 708
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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Footnotes

*

Geological Survey of Canada Contribution No. 44786.

†

According to the summary published in 1886 in Z. Krystallogr. 11, 315, the paper in which Lorenzen first describes the new mineral kornerupine, 'Undersogelse af Mineralier fra Gronland', was to be published in Meddelels. Gronl. 7, in 1884. This issue, however, did not appear until 1893. None the less, Lorenzen is credited with the first discovery of kornerupine in 1884 and his name, komerupine, is given priority over prismatine, the name introduced by Sauer (1886) for kornerupine from Waldhelm, Saxony, presently a part of the German Democratic Republic.

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