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Compositional variation in minerals of the chevkinite group

Published online by Cambridge University Press:  05 July 2018

R. Macdonald  and
H. E. Belkin
R. Macdonald*
Affiliation:
Environmental Sciences, Lancaster University, Lancaster LA1 4YQ, UK
H. E. Belkin
Affiliation:
U.S. Geological Survey, 956 National Center, Reston, Virginia 20192, USA
*
*E-mail: [email protected]
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Abstract

The composition of chevkinite and perrierite, the most common members of the chevkinite group, is closely expressed by the formula A4BC2D2Si4O22, where A = (La,Ce,Ca,Sr,Th), B = Fe2+, C = (Fe2+,Fe3+,Ti,Al,Zr,Nb) and D = Ti. The A site is dominated by a strong negative correlation between (Ca+Sr) and the REE. Chondrite-normalized REE patterns are very variable, e.g. in LREE/HREE and Eu/Eu*. The C site is dominated by Ti, Al and Fe2+, in very variable proportions. Most chevkinites and perrierites are close to stoichiometric, with cation sums between 12.9 and 13.5, compared to the theoretical 13. There is no single, generally applicable charge balancing substitution scheme in the group; however, the general relationship

defines a linear array with r2 = 0.91. Chevkinite and perrierite are shown to be compositionally distinct on the basis of CaO, FeO*, Al2O3 and Ce2O3 abundances. Chevkinite forms mainly in chemically evolved parageneses, such as syenites, rhyolites and fenites associated with carbonatite complexes. Perrierite is more commonly recorded from igneous rocks of mafic to intermediate composition. The compositional characteristics and possible structural formulae of other members of the chevkinite group are reviewed briefly.

Keywords

chevkiniteperrieritecompositional variation
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 6 , December 2002 , pp. 1075 - 1098
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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