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Pyroxenes and coexisting minerals in the Cheviot granite

Published online by Cambridge University Press:  05 July 2018

H. W. Haslam
H. W. Haslam*
Affiliation:
British Geological Survey, 154 Clerkenwell Road, London EC1R 5DU
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Abstract

Orthopyroxene and clinopyroxene, with biotite, are widespread in the high-level Cheviot granite, while amphibole is rare. The pyroxene compositions are very close to (Mg,Fe)2Si2O6 and Ca(Mg,Fe)Si2O6. Biotite compositions, with low Si and Al, are characteristic of biotites coexisting with pyroxenes. Geothermometric estimates based on oxide and pyroxene compositions show that present mineral compositions result from post-consolidation equilibration.

Keywords

graniteCheviotrare earth elementspyroxenebiotitegeothermometry
Type
Silicate mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 358 , December 1986 , pp. 671 - 674
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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