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An occurrence of the spinel end-member Mg2TiO4 and related spinel solid solutions

Published online by Cambridge University Press:  05 July 2018

J. Gittins ,
J. J. Fawcett ,
J. C. Rucklidge  and
C. K. Brooks
J. Gittins
Affiliation:
Department of Geology, University of Toronto, Toronto, Canada, M5S 1A1
J. J. Fawcett
Affiliation:
Department of Geology, University of Toronto, Toronto, Canada, M5S 1A1
J. C. Rucklidge
Affiliation:
Department of Geology, University of Toronto, Toronto, Canada, M5S 1A1
C. K. Brooks
Affiliation:
Institute for Petrologi, Kobenhavns Universitet, Øster Voldgade 10, DK-1350, Kobenhavns K. Denmark
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Abstract

Black, opaque grains of a spinel whose composition is (Mg2TiO4) 85.8, (MgFe2O4) 0.4 (FeFe2O4) 13.8 (mole %) coexist with a MgAl2O4 spinel and geikielite in a periclase-forsterite marble that has been thermally metamorphosed against an alkalic ultramafic intrusion of Caledonian age in the Kangerdlugssuaq region of East Greenland. The spinel appears to be the closest recorded approach to the end-member Mg2TiO4 among natural rocks, and to be part of a solid-solution series extending across the join Mg2TiO4-MgFe2O4-FeFe2O4, the existence of which has not previously been reported. The composition of the series appears to be controlled by the fO2 that prevails during metamorphism.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 135 - 137
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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References

Brooks, C. K., Fawcett, J. J., Gittins, J., and Rucklidge, J. C. (1981) Can. J. Earth Sci. 18, 27485.Google Scholar
Gittins, J., Nielson, P. A., Fawcett, J. J., Brooks, C. K., and Rucklidge, J. C. (1977) Trans. Am. Geophys. Union, 58, 517.Google Scholar
Muan, A., Hauck, J., and Léfall, T. (1972) Proc. Third Lunar Sci. Conf. 1, 185-96Google Scholar