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The significance of the gabbroic xenoliths from Gough Island, South Atlantic

Published online by Cambridge University Press:  14 March 2018

R. W. Le Maitre
R. W. Le Maitre*
Affiliation:
Department of Mineralogy, British Museum (Natural History), Cromwell Road, London, S.W. 7
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Summary

The petrography and mineralogy of a series of gabbroic xenoliths, consisting essentially of varying proportions of olivine, clinopyroxene, orthopyroxene, and plagioclase, are described from Gough Island. These are compared with xenoliths from other oceanic localities. Four new analyses of xenoliths and six of pyroxenes are presented, together with some partial analyses of plagioclases. It is concluded that the xenoliths are derived from the mantle above the magma source area. The composition of the mantle in this region is thought to be that of an olivine-tholeiite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 303 - 317
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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