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Mineral chemistry of regional chloritoid assemblages in the Chlorite Zone, Lycian Nappes, South-west Turkey

Published online by Cambridge University Press:  05 July 2018

J. R. Ashworth  and
M. M. Evirgen
J. R. Ashworth
Affiliation:
Department of Geological Sciences, University of Aston in Birmingham, Gosta Green, Birmingham B4 7ET
M. M. Evirgen
Affiliation:
Hidrojeoloji Mühendisliği Bölümü, Mühendislik Fakültesi, Hacettepe Üniversitesi, Beytepe Kampüsü, Ankara, Turkey
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Abstract

In the Ören area at the base of the Lycian Nappes, chloritoid is common on a regional scale. Mn and inferred Fe3+ contents are low. Chloritoid + quartz occur rather than the more hydrous equivalent pyrophyllite + chlorite, Fe/(Fe + Mg) values in chlorite ranging down to 0·27. Calcite and dolomite, which coexist with chloritoid and pyrophyllite, give a temperature estimate of 350± 30°C, implying moderate to high activities of water for pyrophyllite stability. Muscovite-paragonite geothermometry is unreliable. Mg/Fe distribution coefficients between chloritoid and chlorite differ systematically from literature values from higher grades (biotite and garnet zones). Intensity of colour in chloritoid correlates with inferred Fe3+ content, which decreases outwards in grains showing prograde growth zoning.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 347 , June 1984 , pp. 159 - 165
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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