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Zoned garnets in some Scottish Dalradian pelites

Published online by Cambridge University Press:  05 July 2018

C. Sivaprakash
C. Sivaprakash*
Affiliation:
Geological Department, The Associated Cement Cos., Ltd., 121 Maharshi Karve Road, Bombay 400 020, India
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Abstract

Zoning in garnets in Barrovian garnet zone rocks of central Perthshire is shown to be dependent on the continuous prograde reaction histories in which the garnet was involved. In highly aluminous rocks, garnet grows at the expense of chloritoid and staurolite whereas in less aluminous rocks garnet grows at the expense of chlorite. Minerals included in garnet such as ilmenite, plagioclase, chlorite, and chloritoid show compositional changes which with the garnet zoning elucidate the garnet-forming reactions. Where garnet is resorbed to produce staurolite the former loses Fe at its rim to staurolite so that ‘reverse’ zoning of decreasing Fe and increasing Mn and Ca towards garnet rim develops.

Type
Research Article
Information
Mineralogical Magazine , Volume 44 , Issue 335 , September 1981 , pp. 301 - 307
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1981

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