Ba-Fe titanates in peralkaline granite of the Ilímaussaq Complex, South Greenland

Małgorzata Cegiełka, Bogusław Bagiński, Ray Macdonald, Beata Marciniak-Maliszewska, Marcin Stachowicz

Abstract


A peralkaline granite of the Ilímaussaq Complex, South Greenland, contains the rare mineral henrymeyerite [(Ba0.92Na0.05Ca0.03)1.0(Ti6.87Fe2+1.04Nb0.03)7.9O16], a low-Fe Ba titanate [(Ba0.74Ca0.02Na0.05)0.8 (Ti4.9oFe2+0.15Nb0.04)5.1O11], and an unidentified Ba titanosilicate. Both titanates show the coupled substitution 2Na+ + Si4+ → Ba2+ + Ti4+. The minerals are present as tiny crystals fringing ilmenite inclusions in an amphibole crystal and are thought to have formed during the hydrothermal stage of the granite’s evolution.


Keywords


Ilímaussaq peralkaline granite; Henrymeyerite; Low-Fe Ba Titanate

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