Abstrakt
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+0.15 Nb0.04)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.
Przejdź do artykułu
Autorzy i Afiliacje
Beata Marciniak-Maliszewska
1
- Department of Geochemistry, Mineralogy and Petrology, Faculty of Geology, University of Warsaw, ul. Żwirki i Wigury 93, 02-089 Warsaw, Poland
- Institute of Geological Sciences, Polish Academy of Sciences, Research Centre in Warsaw,Twarda 51/55, 00-818 Warsaw, Poland
- Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
pl
en
