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Stability of chlorite-quartz assemblages in rocks south and west of Keswick, Cumbria

Published online by Cambridge University Press:  05 July 2018

R. G. J. Strens ,
R. Freer  and
R. J. Firman
R. G. J. Strens
Affiliation:
Formerly of School of Physics, University of Newcastle, Newcastle upon Tyne, NE1 7RU
R. Freer*
Affiliation:
Department of Metallurgy and Materials Science, University of Manchester/UMIST, Grosvenor Street, Manchester M1 7HS
R. J. Firman
Affiliation:
Department of Geology, University of Nottingham, University Park, Nottingham NG7 2RD
*
*To whom correspondence should be addressed
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Abstract

Chlorite minerals from six distinctive chlorite-quartz parageneses in central Borrowdale have been studied. All specimens were 14Å (IIb) chlorites. Cell parameters and β refractive index exhibit an approximate linear dependence on composition for the range Fe/(Fe + Mg) = 0.46 to 0.84. The data indicate an apparent trend that chlorite iron content increases with temperature. This is in conflict with experimental studies (Flemming and Fawcett, 1976), and it is inferred that the observed compositional variations reflect the availability of iron in the veins rather than a dependence on temperature.

Keywords

chloritechlorite-quartz paragenesesKeswickCumbria
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 51 , Issue 363 , December 1987 , pp. 649 - 654
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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