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Chloritoid-staurolite assemblages from Barrow's Zones in Central Perthshire, Scotland

Published online by Cambridge University Press:  01 May 2009

M. P. Atherton  and
R. A. Smith
M. P. Atherton
Affiliation:
Department of Geology, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX
R. A. Smith
Affiliation:
Geological Survey of Northern Ireland, 20 College Gardens, Belfast, BT9 6BS
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Summary

Chloritoid-biotite- and chloritoid-staurolite-bearing rocks occur around Blair Atholl, Perthshire. Textures suggest staurolite to be produced from chloritoid by a prograde ionic reaction involving muscovite. Chloritoid rocks are aluminous, lying above the muscovite-chlorite join, and staurolite formation involves the breakdown of chloritoid and muscovite. Their presence indicates that the chloritoid-biotite zone of Stonehaven continues as far SW as Central Perthshire, although its occurrence is severely limited by a lack of aluminium-rich rocks. The use of the chloritoid outcrop in the NE as an indication of pressure decrease to the SW is therefore queried.

Type
Articles
Information
Geological Magazine , Volume 116 , Issue 6 , November 1979 , pp. 469 - 476
Copyright
Copyright © Cambridge University Press 1979

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