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Rhönite paragenesis in pyroxenite xenoliths, Mount Sidley volcano, Marie Byrd Land, West Antarctica

Published online by Cambridge University Press:  05 July 2018

R. H. Grapes ,
R. J. Wysoczanski  and
P. W. O. Hoskin
R. H. Grapes*
Affiliation:
Institut für Mineralogie, Petrologie und Geochemie, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany
R. J. Wysoczanski
Affiliation:
Department of Mineral Sciences, National Museum of Natural History, MRC-0119, Smithsonian Institution, Washington, D.C., 20013-7012, USA
P. W. O. Hoskin
Affiliation:
Institut für Mineralogie, Petrologie und Geochemie, Albert-Ludwigs-Universität Freiburg, D-79104 Freiburg, Germany
*
* E-mail: rodney.grapes@minpet.uni-freiburg.de
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Abstract

Rhönite occurs in lower crustal pyroxenite xenoliths erupted in phonolite from the Mount Sidley composite volcano, Marie Byrd Land, Antarctica, as a localized breakdown product, with plagioclase, clinopyroxene, ± olivine ± Ti-magnetite + melt, of kaersutite, and as microphenocrysts (with olivine, plagioclase, clinopyroxene) in pockets of basanitic melt. Rhö nite after kaersutite has a more NaSi-rich/ CaAl-poor composition, lower Ti, and formed at higher oxidation (∼NNO) conditions than rhönite occurring as microphenocrysts in basanite. Comparison with experimentally determined rhönite stability in understaturated alkali basalt and as a reaction product after Ti-amphibole indicates that the Mount Sidley rhönite (and associated minerals) formed between 1090 and 1190°C at <0.5 kbar, presumably during temporary residence of the xenoliths in a shallow magma chamber below the volcanic edifice.

Keywords

rhonötepyroxenite xenolithsMount SidneyvolcanoAntarcticakaersutite.
Type
Research Article
Information
Mineralogical Magazine , Volume 67 , Issue 4 , August 2003 , pp. 639 - 651
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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