| 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. |
| Genre: | Article |
| ProdID: | 70037345 |
| Citation Author: | Macdonald, R.; Belkin, H. E.; Wall, F.; Baginski, B. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 796 |
| Citation Issue: | 5 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Mineralogical Magazine |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 20 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Compositional variation in the chevkinite group: New data from igneous and metamorphic rocks; 2009; Article; Journal; Mineralogical Magazine; Macdonald, R.; Belkin, H. E.; Wall, F.; Baginski, B. |
| Citation Start Page: | 777 |
| Citation Volume: | 73 |
| Citation Year: | 2009 |
| Type: | citation/reference |
| Text: | Compositional variation in the chevkinite group: New data from igneous and metamorphic rocks; 2009; Article; Journal; Mineralogical Magazine; Macdonald, R.; Belkin, H. E.; Wall, F.; Baginski, B. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1180/minmag.2009.073.5.777 |
| Date Other: | Thu, 1 Jan 2009 00:00 -0600 |
| Publisher: | |
