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Peraluminous sapphirine from the Aileron district, Arunta Block, central Australia

Published online by Cambridge University Press:  05 July 2018

R. G. Warren  and
B. J. Hensen
R. G. Warren
Affiliation:
Bureau of Mineral Resources, GPO Box 378, Canberra, 2601, Australia
B. J. Hensen
Affiliation:
Department of Applied Geology, University of New South Wales, Kensingston, 2033, Australia
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Abstract

Specimens collected from a small lens of phlogopite-rich rock in the granulite-facies terrain of the Arunta Block, central Australia, have unusual bulk compositions and mineral assemblages. One sample consists of phlogopite enclosing blue spinel (mg 96) with minute granules of corundum and sapphirine at the margins; a second of phlogopite enclosing porphyroblasts of corundum and peraluminous sapphirine. In the first the sapphirine is close to the 7 : 9 : 3 composition; in the other it is markedly peraluminous, e.g. (Mg1.628Fe0.028)Al4.714Si0.636O10, intermediate between the 7 : 9 : 3 and 3 : 5 : 1 members. The texture suggests that this sapphirine is a stable phase in equilibrium with eastonitic phlogopite and corundum. The very potassic, very magnesian bulk composition of the rocks is attributed to potassium metasomatism of a protolith consisting of magnesian chlorite and quartz.

Keywords

sapphirinephlogopitecorundumArunta BlockAustralia
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 361 , September 1987 , pp. 409 - 415
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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