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Mantle-derived sapphirine

Published online by Cambridge University Press:  05 July 2018

W. L. Griffin  and
S. Y. O'Reilly
W. L. Griffin
Affiliation:
Mineralogisk-Geologisk Museum, Sars Gate 1, 0562, Oslo 5, Norway
S. Y. O'Reilly
Affiliation:
School of Earth Sciences, Macquarie University, North Ryde, NSW 2113, Australia
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Abstract

A xenolith from the Delegate breccia pipe (New South Wales, Australia) contains sapphirine in equilibrium with aluminous clinopyroxene, garnet, and plagioclase (An48). This unusual assemblage probably developed from a clinopyroxene (±spinel ± plagioclase) cumulate during cooling from > 1400°C to c. 1000°C at pressures near 15 kbar. The sapphirine is close to the 7:9:3 composition, suggesting that bulk composition is more important than P-T conditions in determining the stoichiometry of natural sapphirines. A similar occurrence of sapphirine has also been recorded in mantlederived xenoliths from the Stockdale kimberlite in Kansas. Re-examination of sapphirine granulites from Finero suggests that their primary assemblages and origin may have been similar to those of the Delegate xenolith. Sapphirine is clearly stable under upper-mantle conditions in Ca-Al-Mg-rich bulk compositions.

Type
Silicate mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 358 , December 1986 , pp. 635 - 640
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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