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

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

Acta Geologica Polonica

2022

Vol. 72, no. 1

1--8

A peralkaline granite of the Ilímaussaq Complex, South Greenland, contains the rare mineral henrymeyerite [(Ba0.92Na 0.05Ca0.03) 1.0(Ti6.87Fe2+1.04Nb 0.03)7.9O 16], a low-Fe Ba titanate [(Ba0.74 Ca0.02Na 0.05) 0.8 (Ti4.9o Fe2+0.15Nb 0.04)5.1O 11], 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.