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Compositional variation in the chevkinite group: New data from igneous and metamorphic rocks

Mineralogical Magazine

By:
, , , and
DOI: 10.1180/minmag.2009.073.5.777

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Abstract

Electron microprobe analyses are presented of chevkinite-group minerals from Canada, USA, Guatemala, Norway, Scotland, Italy and India. The host rocks are metacarbonates, alkaline and subalkaline granitoids, quartz-bearing pegmatites, carbonatite and an inferred K-rich tuff. The analyses extend slightly the range of compositions in the chevkinite group, e.g. the most MgO-rich phases yet recorded, and we report two further examples where La is the dominant cation in the A site. Patchilyzoned crystals from Virginia and Guatemala contain both perrierite and chevkinite compositions. The new and published analyses are used to review compositional variation in minerals of the perrierite subgroup, which can form in a wide range of host rock compositions and over a substantial pressure-temperature range. The dominant substitutions in the various cation sites and a generalized substitution scheme are described. ?? 2009 The Mineralogical Society.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Compositional variation in the chevkinite group: New data from igneous and metamorphic rocks
Series title:
Mineralogical Magazine
DOI:
10.1180/minmag.2009.073.5.777
Volume
73
Issue:
5
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Mineralogical Magazine
First page:
777
Last page:
796
Number of Pages:
20