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

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Marco E. Ciriotti
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Ba-Fe titanates in peralkaline granite of the Ilímaussaq Complex, South Greenland

Messaggio da Marco E. Ciriotti » mer 10 ago, 2022 11:47

Referenza:
▪ Cegielka, M., Bagiński, B., MacDonald, R., Marchiniak-Maliszewska, B., Stachowicz, M. (2022): Ba-Fe titanates in peralkaline granite of the Ilímaussaq Complex, South Greenland. Acta Geologica Polonica, 72, 1–8.

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.
Marco E. Ciriotti

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