Mantle-derived sapphirine

W. L. Griffin; S. Y. O'Reilly

Mantle-derived sapphirine

Research output: Contribution to journal › Article › peer-review

Abstract

A xenolith from the Delegate breccia pipe, New South Wales, contains sapphirine in equilibrium with aluminous clinopyroxene, pyrope and plagioclase (An₄₈). This unusual assemblage probably developed from a clinopyroxene (+ or - spinel + or - plagioclase) cumulate during cooling from >1400 to -1000oC at P approx 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 stoichiometry of natural sapphirines. Comparisons are made with xenoliths at Stockdale and sapphirine granulites from Finero. Sapphirine is clearly stable under upper-mantle conditions in Ca-Al-Mg-rich bulk compositions.-R.A.H.

Original language	English
Pages (from-to)	635-640
Number of pages	6
Journal	Mineralogical Magazine
Volume	50
Issue number	4
Publication status	Published - 1986
Externally published	Yes

Cite this

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title = "Mantle-derived sapphirine",

abstract = "A xenolith from the Delegate breccia pipe, New South Wales, contains sapphirine in equilibrium with aluminous clinopyroxene, pyrope and plagioclase (An48). This unusual assemblage probably developed from a clinopyroxene (+ or - spinel + or - plagioclase) cumulate during cooling from >1400 to -1000oC at P approx 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 stoichiometry of natural sapphirines. Comparisons are made with xenoliths at Stockdale and sapphirine granulites from Finero. Sapphirine is clearly stable under upper-mantle conditions in Ca-Al-Mg-rich bulk compositions.-R.A.H.",

author = "Griffin, \{W. L.\} and O'Reilly, \{S. Y.\}",

year = "1986",

language = "English",

volume = "50",

pages = "635--640",

journal = "Mineralogical Magazine",

issn = "0026-461X",

publisher = "Cambridge University Press (CUP)",

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TY - JOUR

T1 - Mantle-derived sapphirine

AU - Griffin, W. L.

AU - O'Reilly, S. Y.

PY - 1986

Y1 - 1986

N2 - A xenolith from the Delegate breccia pipe, New South Wales, contains sapphirine in equilibrium with aluminous clinopyroxene, pyrope and plagioclase (An48). This unusual assemblage probably developed from a clinopyroxene (+ or - spinel + or - plagioclase) cumulate during cooling from >1400 to -1000oC at P approx 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 stoichiometry of natural sapphirines. Comparisons are made with xenoliths at Stockdale and sapphirine granulites from Finero. Sapphirine is clearly stable under upper-mantle conditions in Ca-Al-Mg-rich bulk compositions.-R.A.H.

AB - A xenolith from the Delegate breccia pipe, New South Wales, contains sapphirine in equilibrium with aluminous clinopyroxene, pyrope and plagioclase (An48). This unusual assemblage probably developed from a clinopyroxene (+ or - spinel + or - plagioclase) cumulate during cooling from >1400 to -1000oC at P approx 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 stoichiometry of natural sapphirines. Comparisons are made with xenoliths at Stockdale and sapphirine granulites from Finero. Sapphirine is clearly stable under upper-mantle conditions in Ca-Al-Mg-rich bulk compositions.-R.A.H.

UR - https://www.scopus.com/pages/publications/0022891352

M3 - Article

AN - SCOPUS:0022891352

SN - 0026-461X

VL - 50

SP - 635

EP - 640

JO - Mineralogical Magazine

JF - Mineralogical Magazine

IS - 4

ER -

Mantle-derived sapphirine

Abstract

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