The compositional range of magmatic Mn-garnets in the Galway Granite, Connemara, Ireland

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Authors:Whitworth, M. P.; Feely, M.
Author Affiliations:Primary:
Her Majesty's Inspectorate of Pollution, Darlington, United Kingdom
Other:
University College, Ireland
Volume Title:Mineralogical Magazine
Source:Mineralogical Magazine, 58( 1(390)), p.163-168. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0026-461X
Publication Date:1994
Note:In English. 17 refs.; illus., incl. 1 table, geol. sketch map
Summary:EPMA results for 49 garnets from a pegmatite and aplite exposed in the centre of the non-garnetiferous Costelloe Murvey granite show mol.% spessartine of 64-83 and 85-91, respectively; Y2O3 amounts to 1.85 and 0.65%. Aqueous fluid released during the evolution of this granite may have complexed some of the available Mn and transported it to the nucleation site, allowing local high concentrations of Mn to be present in the upper parts of the intrusion and hence low-P crystallization of spessartine-rich garnets. [R.A.H.]
Subjects:Aplite; Crystal chemistry; Crystal fractionation; Crystal zoning; Crystallization; Electron probe data; Garnet group; Granites; I-type granites; Igneous rocks; Major elements; Manganese; Metals; Mineral assemblages; Nesosilicates; Orthosilicates; Pegmatite; Plutonic rocks; Rare earths; Silicates; Trace elements; Yttrium; Connemara; Europe; Galway Granite; Galway Ireland; Ireland; Western Europe; Murvey Granite
Coordinates:N525500 N534000 W0080000 W0101500
Abstract Numbers:94M/2221
Record ID:2000051754
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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