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Sapphire-bearing rocks from MacRobertson Land, Antarctica

Published online by Cambridge University Press:  14 March 2018

E. R. Segnit
E. R. Segnit*
Affiliation:
School of Geology, University of Adelaide
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Summary

A small isolated outcrop in a large area of charnockites in the Mawson area, MacRobertson Land, Antarctica, consists of enstatite-sapphirine-cordierite rocks. Other highly magnesian outcrops occur in the district and these rocks may be completely recrystallized xenoliths. Analyses of the country rock, the two sapphirine-bearing rocks, and the sapphirine are given; the country rock is very rich in iron and has a high FeO : MgO ratio, while the sapphirine-bearing rocks are very low in iron and high in MgO, approximating to ternary mixtures of MgO, Al2O3, and SiO2.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 239 , December 1957 , pp. 690 - 697
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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