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Mineralogical Magazine; April 2002; v. 66; no. 2; p. 337-352; DOI: 10.1180/0026461026620031
© 2002 Mineralogical Society of Great Britain and Ireland
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Cummingtonite in the Dalradian of NE Scotland

C. G. Smith and E. R. Phillips*

British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK

* E-mail: erp{at}bgs.ac.uk

The first recorded occurrence of cummingtonite in the Scottish Dalradian is described. The mineral occurs in thin layers within a psammite-semipelite sequence forming the lower part of the Easdale Subgroup in which it coexists with bytownitic plagioclase, almandine-rich garnet and quartz. Textural and mineral chemical evidence suggest that the cummingtonite developed from hornblende during amphibolite-facies regional metamorphism. The protolith to this cummingtonite-bearing rock is believed to have been a basaltic tuff, possibly alkaline in character, containing a significant proportion of sedimentary detritus. The cummingtonite-bearing rock may provide the earliest record of basic volcanism in the Dalradian of the Ballater district.

KEYWORDS: cummingtonite, amphibolite-facies metamorphism, Dalradian, NE Scotland




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