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Ion Microprobe Determination of Rare Earth Elements in Perovskite from Kimberlites and Alnöites

Published online by Cambridge University Press:  05 July 2018

Roger H. Mitchell  and
Stephen J. B. Reed
Roger H. Mitchell
Affiliation:
Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada
Stephen J. B. Reed
Affiliation:
Bullard Laboratories, Department of Earth Sciences, Madingley Road, Cambridge CB2 0EZ, England
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Abstract

Ion microprobe analysis ofperovskite from kimberlites and alnöites permits the accurate determination of La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Er and Yb at the part per million level. Other rare earth elements (REE) are subject to interferences in the mass spectrum caused by matrix-derived molecular ions and cannot easily be determined with comparable precision. Chondrite-normalized plots of the ion probe REE data are smooth curves, confirming the superiority of this technique over electron microprobe methods at the levels of REE abundance found in these perovskites. The perovskites analysed contain between 2.8 and 7.1 wt. % REE oxides and are highly enriched in the light REE, having La/Yb ratios of 577–3229. These La/Yb ratios are not representative of the parental magmas but result from REE fractionation during crystallization of the perovskite. Parental magma La/Yb ratios are estimated to be of the order of 120–650. The lower La/Yb ratios (80–200) found for whole-rock kimberlites are considered to result from contamination by relatively heavy REE-enriched crustal material.

Keywords

ion microproberare earth elementsperovskitekimberlitealnöite
Type
Mineralogy and Crystal Structures
Information
Mineralogical Magazine , Volume 52 , Issue 366 , June 1988 , pp. 331 - 339
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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