Zoned garnets in some Scottish Dalradian pelites

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Authors:Sivaprakash, C.
Author Affiliations:Primary:
Associated Cement Cos., Bombay 400020, India
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 44(335), p.301-307. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1981
Note:In English. 14 refs.; illus. incl. sketch map
Summary: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. [R.A.H.]
Subjects:Alkaline earth metals; Calcium; Cambrian; Dalradian; Geochemistry; Iron; Manganese; Metals; Metamorphic rocks; Metamorphism; Metapelite; Metasedimentary rocks; P-T conditions; Paleozoic; Partitioning; Petrology; Precambrian; Zoning; Europe; Great Britain; Perthshire Scotland; Scotland; United Kingdom; Western Europe; Barrovian-type deposits; Garnet
Abstract Numbers:82M/0578
Record ID:1982063540
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique, Vandoeuvre-les-Nancy, France
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