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

Abstract

: Cegiełka, M., Bagiński, B., Macdonald, R., Marciniak-Maliszewska, B. and Stachowicz, M. 2022. Ba-Fe tita - nates in peralkaline granite of the Ilímaussaq Complex, South Greenland. Acta Geologica Polonica , 72 (1), 1−8. A peralkaline granite of the Ilímaussaq Complex, South Greenland, contains the rare mineral henrymeye rite [(Ba 0.92 Na 0.05 Ca 0.03 ) 1.0 (Ti 6.87 Fe 2+1.04 Nb 0.03 ) 7.9 O 16 ], a low-Fe Ba titanate [(Ba 0.74 Ca 0.02 Na 0.05 ) 0.8 (Ti 4.9o Fe 2+0.15 Nb 0.04 ) 5.1 O 11 ], and an unidentified Ba titanosilicate. Both titanates show the coupled substitution 2Na + + Si 4+ → Ba 2+ + Ti 4+ . 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.