Pyroxenes and Coexisting Minerals in the Cheviot Granite

H. W. Haslam
British Geological Survey, 154 Clerkenwell Road, London EC1R 5DU

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: granite • Cheviot • rare earth elements • pyroxene • biotite • geothermometry

Mineralogical Magazine; December 1986 v. 50; no. 358; p. 671-674; DOI: 10.1180/minmag.1986.050.358.13
© 1986, The Mineralogical Society
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