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The Canadian Mineralogist; June 2007; v. 45; no. 3; p. 497-501; DOI: 10.2113/gscanmin.45.3.497
© 2007 Mineralogical Association of Canada
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Articles

HENRYMEYERITE IN THE METASOMATIZED UPPER MANTLE OF EASTERN ANTARCTICA

Lia N. Kogarko1,§, Gero Kurat2 and Theodoros Ntaflos3

1 Vernadsky Institute of Geochemistry and Analytical Chemistry, Kosygin str. 19, Moscow, 117975, Russia
2 Burgring 7, A-1010 Vienna, Austria
3 Department of Lithospheric Sciences, University of Vienna, Althanstrasse 9, A-1090 Vienna, Austria

§ E-mail address: kogarko{at}mail.ru

D’après une étude minéralogique de xénolithes lherzolitiques et harzburgitiques provenant de la partie orientale de l’Antarctique, le manteau supérieur de cette région aurait été affecté par une très importante métasomatose carbonatée. Nous décrivons pour la première fois la henrymeyerite, (Ba0.97Ca0.03K0.03Na0.11){sum}1.14 (Fe0.92Mg0.17Al0.02){sum}1.11 (Ti6.66Si0.25){sum}6.91 O16, dans un matériau mantellique. Nous l’avons trouvé dans des zones à granulométrie fine contenant un clinopyroxène de seconde génération, spinelle, olivine, chlorapatite contenant du soufre, phlogopite riche en Ba et en Ti, calcite, dolomite, magnésite riche en Fe, et un minéral monoclinique du groupe de la humite.

(Traduit par la Rédaction)

Mots-clés: henrymeyerite, métasomatose du manteau, xénolithes, Antarctique oriental.





This Article
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