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Subcalcic, Fe-rich amphiboles in meta-dolerites, Glenrock Station, NSW, Australia

Published online by Cambridge University Press:  05 July 2018

R. Offler
R. Offler*
Affiliation:
Department of Geology, University of Newcastle, NSW, Australia 2308
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Abstract

Sub-greenschist facies metamorphism has produced unusual subcalcic, Fe-rich actinolitic amphiboles in meta-dolerites from the Glenrock Station area, NSW. They show edenite, riebeckite, ferri-tschermakite and Ti-tschermakite coupled substitutions. Their high Fe content is attributed to high aFe2+ and aFe3+ in the fluid phase produced during the breakdown of clinopyroxene, hornblende, magnetite, and ilmenite. The high aFe2+ led to Fe led to Fe2- occupying the B site, resulting in the formation of subcalcic amphiboles. Variation in aFe2+, aFe3+, aMg, aSi, aAl, and aCa, in different domains resulted in the crystallization of chemically inhomogeneous amphiboles.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 346 , March 1984 , pp. 47 - 52
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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