Sapphire-Bearing Rocks from MacRobertson Land, Antarctica

E. R. Segnit
School of Geology, University of Adelaide.

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.

Mineralogical Magazine; December 1957 v. 31; no. 239; p. 690-697; DOI: 10.1180/minmag.1957.31.239.07
© 1957, The Mineralogical Society
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