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Vol. 3 (2000 year), No. 2

Subbotin V.V., Subbotina G.F.
Minerals of the pyrochlore group in phoskorites and carbonatites of the Kola Peninsula

The paper contains the characteristics of the pyrochlore group minerals from phoskorites and carbonatites of alkaline-ultrabasic Vuorijarvi, Sebljavr, Kovdor and Sallanlatva massifs. They are represented by pyrochlore, uranopyrochlore, and bariopyrochlore. Among pyrochlores uranium-, calcium-sodium- and barium-bearing varieties are distinguished basing on their chemical composition, time of formation and some other features. Chemical composition and microheterogenity of the minerals and their varieties have been studied using the microprobe method. The main tendencies of the chemical evolution of this group minerals in polystage process of carbonatites formation have been established, as well as the specific features of pyrochlore composition in different massifs.

(in Russian, стр.10, fig. 9, tables. 4, ref 42, MS Word 95, MS Word 95 31700 Kb)