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

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Authors:Campbell, Linda S.; Henderson, Paul; Wall, Frances; Nielsen, Troels F. D.
Author Affiliations:Primary:
Natural History Museum, London, United Kingdom
Other:
Oster Voldgade 10, Copenhagen, Denmark
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 61( 2(405)), p.197-212. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1997
Note:In English. Includes an appendix. 26 refs.; illus., incl. 5 tables
Summary: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.
Subjects:Cenozoic; Crystal chemistry; Igneous rocks; Intrusions; Ion exchange; Loparite; Metals; Niobates; Oxides; Perovskite; Plutonic rocks; Rare earths; Tertiary; Ultramafics; Arctic region; East Greenland; Greenland; Gardiner Complex
Abstract Numbers:97M/2963
Record ID:1997044922
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
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