Health & Environmental Research Online (HERO)


Print Feedback Export to File
7466726 
Journal Article 
Zirconolite, CaZrTi2O7, re-examined from its type locality at Afrikanda, Kola Peninsula, Russia and some Synroc implications 
Bulakh, AG; Nesterov, AR; Williams, CT 
2006 
1 
Neues Jahrbuch fuer Mineralogie. Abhandlungen
ISSN: 0077-7757 
182 
2 
109-121 
English 
WOS:000237799600001 
Zirconolite of BORODIN et al. (1956) from type locality at Afrikanda, Kola Peninsula, Russia, consists of a core of calzirtite and baddeleyite, and a rim composed of an initial CaZrTi2O7 phase and various secondary minerals. This initial phase is both sector zoned and oscillatory zoned, and has variable composition. The principal substitutions are as follows: REE + Ti double left right arrow Ca + Me5+; Me6+ + Me2+ double left right arrow 2Ti; ACT(4+) + Me2+ double left right arrow Ca + Ti. Alteration of the initial phase is characterised by introduction of Si, H2O, Ba, Th and U, loss of Ca, Fe, Ti and Zr, and little change in Nb and REE. Zirconolite is an important constituent of Synroc, and it could easily be replaced by Si-bearing phases that concentrate U and Th much more then in initial ceramic material. 
zirconolite; zirkelite; Afrikanda; Kola Peninsula; Russia; calzirtite; baddeleyite; Symoc