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Rare earth chemistry of perovskite group minerals from the Gardiner Complex, East Greenland

Published online by Cambridge University Press:  05 July 2018

Linda S. Campbell ,
Paul Henderson ,
Frances Wall  and
Troels F. D. Nielsen
Linda S. Campbell
Affiliation:
The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Paul Henderson
Affiliation:
The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Frances Wall
Affiliation:
The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Troels F. D. Nielsen
Affiliation:
Øster Voldgade 10, 1350 Copenhagen K, Denmark
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Abstract

Perovskite group minerals, general formula ABX3, from the intrusive ultramafic alkaline Gardiner Complex, East Greenland, range from almost pure CaTiO3 (perovskite, sensu stricto), to the rare earth element (REE) variety, loparite-(Ce). Chemical zonation in the perovskites (sensu lato), is described by the substitutions 2Ca2+ = (Na+ + REE3+) on the A-site and 2Ti4+ = (Fe3+ + Nb5+) on the B-site. Other trace elements detected include Th, Sr, Al, Si, Zr, Ta and Sn. Excellent agreement was found between the determinations of the REE by electron microprobe and neutron activation analysis. Chondrite-normalized REE patterns display enrichment in the light rare earths for perovskite, loparite, apatite, melilite and diopside. Mean perovskite/apatite partition coefficients from four of the Gardiner rocks were calculated as La = 10.4, Ce = 13.8, Nd = 13.9, Sm = 9.9, Eu = 7.7, Gd = 5.2, Tb = 5.6, Tm = 5.5, Yb = 2.7 and Lu = 1.6, indicating that perovskite concentrates all REE to a much greater extent than apatite. Light-REE enrichment occurs in both perovskite and apatite.

Keywords

rare earth elementsperovskiteapatitelopariteGardiner ComplexGreenland
Type
Mineralogy
Information
Mineralogical Magazine , Volume 61 , Issue 405 , April 1997 , pp. 197 - 212
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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Footnotes

*

Present address: School of Geological Sciences, Kingston University, Penrhyn Road, Kingston upon Thames, Surrey KTI 2EE, UK.

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