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Babingtonite and Fe-rich Ca-A1 silicates from western Southland, New Zealand

Published online by Cambridge University Press:  05 July 2018

M. B. Duggan
M. B. Duggan*
Affiliation:
Department of Geology, University of Otago, Dunedin, New Zealand
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Abstract

Babingtonite is a common constituent of calcareous volcanic detritus in the interstices of pillow lavas from an outcrop of the Takitimu Group, western Southland, New Zealand, Associated minerals include Fe-rich prehnite (Fe/(Fe+Al) = 0.12–0.33), Fe-rich epidote (Ps24–53), grandite garnet (av. Andradite70 Grossular30), quartz, calcite, chlorite, and pumpellyite. Babingtonite shows little departure from its ideal composition other than minor Mg, Mn, and Al and a trace of Na.

Textural evidence and microprobe data suggest that the babingtonite, Fe-rich epidote, calcite, and quartz formed from hydrothermal solutions by direct precipitation in open cavities and by replacement of higher temperature silicate phases (in particular plagioclase and basaltic glass) in a shallow marine volcanic environment. During subsequent burial and low-grade metamorphism babingtonite was partially replaced by prehnite, less Fe-rich epidote, grandite, and chlorite.

Keywords

babingtoniteprehniteepidotegarnetchloritepumpellyiteSouthlandNew Zealand
Type
Silicate mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 358 , December 1986 , pp. 657 - 665
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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Footnotes

*

Present address: Bureau of Mineral Resources, GPO Box 378, Canberra, ACT, 2601, Australia.

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