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Zirconium-bearing amphiboles from the Igaliko Dyke Swarm, South Greenland

Published online by Cambridge University Press:  05 July 2018

N. J. G. Pearce
N. J. G. Pearce*
Affiliation:
Department of Geological Sciences, University of Durham, South Road, Durham DH1 3LE
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Abstract

Sodic-calcic and alkali amphiboles from benmoreitic members of the Igaliko Dyke Swarm contain up to 4.13 wt. % ZrO2. It is proposed that Zr enters the amphiboles by a coupled substitution of

(where C = octahedral site and T = tetrahedral site) to produce the richest Zr-bearing amphiboles so far identified, with compositions ranging up to

These amphiboles crystallize at a late stage from magmas which were Zr-rich, highly peralkaline and hydrous, with an fo2 close to the synthetic QMF buffer. The incorporation of Zr in to the amphibole is a consequence of the failure of other Zr-bearing phases (such as zircon, baddeleyite, eudialyte) to crystallize.

Keywords

Zr-bearing amphibolesamphibolesIgaliko Dyke SwarmGreenland
Type
Mineralogy
Information
Mineralogical Magazine , Volume 53 , Issue 369 , March 1989 , pp. 107 - 110
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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Footnotes

*

Present address: Dept. of Geology, The University College of Wales, Aberystwyth, Dyfed SY23 3DB, Wales.

References

Bailey, D. K. and Schairer, J. F. (1966) The system Na2O–A12O3–Fe2O3–SiO2 at 1 atmosphere and the petrogenesis of alkali rocks. J. Petrol. 7, 114-70.CrossRefGoogle Scholar
Dana, E. S. (1892) A System of Mineralogy, 6th ed. John Wiley and Sons, New York.Google Scholar
Emeleus, C. H. and Harry, W. T. (1970) The Igaliko Nepheline Syenite Complex. Bull. Gronlands Geologiske Undersogelese 85; als. Meddels. Gronland 186, No. 3. 116 pp.Google Scholar
Jones, A. P. (1980) The petrology and structure of the Motzfeldt Centre, Igaliko, South Greenland. Unpublished PhD Thesis, University of Durham.Google Scholar
Jones, A. P. and Peckett, A. (1980) Zirconium-bearing aegirines from Motzfeldt, South Greenland. Contrib. Mineral. Petrol. 75, 251-5.CrossRefGoogle Scholar
Larsen, L. M. (1976) Clinopyroxenes and coexisting mafic minerals from the alkaline Ilimaussaq intrusion, South Greenland. J. Petrol. 17, 258-90.CrossRefGoogle Scholar
Leake, B. E. (1978) Nomenclature of amphiboles. Mineral. Mag. 42, 533-63.CrossRefGoogle Scholar
Macdonald, R. and Parker, A. (1970) Zirconium in alkaline dykes from the Tugtutôq region, South Greenland. Bull. Geol. Soe. Denmark, 20, 59-63.Google Scholar
Nash, W. P. and Wilkinson, J. F. G. (1970) Shonkin Sag laccolith, Montana. I. Mafic minerals and estimates of temperature, pressure, oxygen fugacity and silica activity. Contrib. Mineral. Petrol. 25, 241-69.CrossRefGoogle Scholar
Pearce, N. J. G. (1988) The petrology and geochemistry of the Igaliko Dyke Swarm, South Greenland. Unpublished PhD thesis, University of Durham.Google Scholar
Shannon, R. D. (1976) Effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallogr. Section A, 32, 751-67.CrossRefGoogle Scholar
Upton, B. G. J. and Emeleus, C. H. (1987) Mid-Proterozoic alkaline magmatism in Southern Greenland: The Gardar Province. In Alkaline Igneous Rocks (Fitton, J. G. and Upton, B. G. J., eds) Spec. Publ. Geol. Soc. London, No. 30.Google Scholar
Watson, E. B. (1979) Zircon saturation in felsic liquids; experimental results and applications to trace element geochemistry. Contrib. Mineral. Petrol. 70, 407-19.CrossRefGoogle Scholar
Yagi, K. (1953) Petrochemical studies on the alkalic rocks of Morotu district, Sakhalin. Geol. Soc. Am. Bull. 64, 769-810.CrossRefGoogle Scholar