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Cummingtonite in the Dalradian of NE Scotland

Published online by Cambridge University Press:  05 July 2018

C. G. Smith  and
E. R. Phillips
C. G. Smith
Affiliation:
British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK
E. R. Phillips*
Affiliation:
British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK
*
*E-mail: [email protected]
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Abstract

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

cummingtoniteamphibolite-facies metamorphismDalradianNE Scotland
Type
Research Article
Information
Mineralogical Magazine , Volume 66 , Issue 2 , April 2002 , pp. 337 - 352
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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