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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

A mineralogical study of lherzolitic and harzburgitic xenoliths of eastern Antarctica shows that the upper mantle of this region has been affected by very strong carbonate metasomatism. We describe for the first time henrymeyerite (Ba0.97Ca0.03 K0.03Na0.11){sum}1.14 (Fe0.92Mg0.17Al0.02){sum}1.11 (Ti6.66Si0.25){sum}6.91 O16 in mantle material. It was found in fine-grained zones containing second-generation clinopyroxene, spinel, olivine, S-bearing chlorapatite, high-Ba, high-Ti phlogopite, calcite, dolomite, Fe-rich magnesite and a mineral of the clinohumite group.

Keywords: henrymeyerite, mantle metasomatism, xenoliths, eastern Antarctica.






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