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Minor elements in perovskite from kimberlites and distribution of the rare earth elements: An electron probe study

Jones, Adrian P. and Wyllie, Peter J. (1984) Minor elements in perovskite from kimberlites and distribution of the rare earth elements: An electron probe study. Earth and Planetary Science Letters, 69 (1). pp. 128-140. ISSN 0012-821X. https://resolver.caltech.edu/CaltechAUTHORS:20160114-073753965

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Abstract

We report REE and minor element distributions for perovskites from seven kimberlites (South Africa and U.S.A.). The REE (1.6–6.3 oxides wt.%) are always strongly light REE enriched, often with Ce > La (chondrite-normalized), and show an expected close correlation with whole-rock analyses. Where examined, perovskite contains far more REE than coexisting apatite, by about an order of magnitude. Calculations indicate that iron is mostly present as Fe^(3+) and is low (1.0–2.9 wt.% Fe_2O_3) compared with perovskite from carbonatite complexes such as Oka (4.4 wt.% FeO [3]). In addition to established Nb (0.3–1.7 oxide wt.%), geochemically interesting elements encountered include Zr (up to 1.5 oxide wt.%), Ba and Sr (up to 0.2, 0.4 oxide wt.% respectively). Specific geological applications suggest a possible genetic link between Wesselton pipe and Benfontein Sills kimberlites, and that carbonate-rich dikes in the Premier mine were derived from kimberlites. The overall similarities with incompatible element-rich titanates in veined mantle peridotites suggest a more direct link between kimberlite magmatism and mantle metasomatism.


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http://dx.doi.org/10.1016/0012-821X(84)90078-5DOIArticle
http://www.sciencedirect.com/science/article/pii/0012821X84900785PublisherArticle
Additional Information:© 1984 Elsevier Science Publishers B.V. Received January 4, 1984; Revised version received March 7, 1984. This research was supported by the Earth Science Division of the National Science Foundation, grants EAR 81-08599 and EAR 83-11758. All material from South Africa was collected by P.J. Wyllie during the First International Kimberlite Conference, 1973, thanks to J.B. Hawthorne of the De Beers Mining Corporation. The two kimberlite samples from the United States were kindly furnished by D. Schulze. R.A. Exley provided useful advice about the electron probe REE method at the University of Chicago, and together with I.M. Steele and A.M. Davis is thanked for helpful discussion. We thank H.O.A. Meyer for a constructive review. Contribution No. 4046, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California.
Funders:
Funding AgencyGrant Number
NSFEAR 81-08599
NSFEAR 83-11758
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Caltech Division of Geological and Planetary Sciences4046
Issue or Number:1
Record Number:CaltechAUTHORS:20160114-073753965
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20160114-073753965
Official Citation:Adrian P. Jones, Peter J. Wyllie, Minor elements in perovskite from kimberlites and distribution of the rare earth elements: An electron probe study, Earth and Planetary Science Letters, Volume 69, Issue 1, 1984, Pages 128-140, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(84)90078-5. (http://www.sciencedirect.com/science/article/pii/0012821X84900785)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63668
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:14 Jan 2016 19:47
Last Modified:03 Oct 2019 09:30

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