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Chlorine-rich potassium hastingsite from West Ongul Island, Lützow–Holm Bay, East Antarctica

Published online by Cambridge University Press:  05 July 2018

Kanenori Suwa ,
Masaki Enami  and
Tatsuro Horiuchi
Kanenori Suwa
Affiliation:
Department of Earth Sciences, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464, Japan
Masaki Enami
Affiliation:
Department of Earth Sciences, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464, Japan
Tatsuro Horiuchi
Affiliation:
Department of Earth Sciences, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya 464, Japan
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Abstract

Chlorine-rich potassium hastingsite occurs in a calcareous pegmatite, a replacement zone and an amphibolite lens within hornblende gneiss on West Ongul Island, Lützow-Holm Bay, East Antarctica. The amphibolite lens and hornblende gneiss were metamorphosed to the kyanite-sillimanite grade of the granulite facies during Proterozoic metamorphism. Chemical analysis (3.27 wt.% Cl), unit cell parameters and optical properties of the Cl-rich potassium hastingsite are given. Cl-rich (> 3 wt.%) calcic amphiboles reported from various rock types are mostly more than 0.9 in (Na+ K) content, more than 0.4 in K/(Na + K) ratio, more than 0.75 in Fe2+/(Fe2+ + Mg + Mn) ratio and more than 1.9 in AlIV content (total iron as FeO and O = 23). The unit cell volume of Cl-rich hastingsite is distinctly larger than that of Cl-poor hastingsite.

Keywords

Cl-rich calcic amphiboleshastingsiteWest Ongul IslandAntarctica
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 363 , December 1987 , pp. 709 - 714
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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