By L. N. Kogarko, V. A. Konova, M. P. Orlova, A. R. Woolley (auth.)
Alkaline rocks and carbonatites have the main various and severe compositions of all igneous rocks. This quantity describes the entire recognized occurrences within the former USSR.
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Extra resources for Alkaline Rocks and Carbonatites of the World: Part Two: Former USSR
I 0 00 " ~ ' Age Probably Palaeozoic, from similarity of the rocks to those of complexes such as Kovdor and Turiy. :...... 0. , •• ,. " · '.... •0 References Kirnarsky and Kozireva, 1978; Sudovikov, 1936. 1 km 30 KOVDOR o • ·.......... '...... ··.... - " 33 Apatite-bearing ijolite Fenitised gneiss Fig, 28, Kandagubskii (after Chuvardinsky and Karaev, 1988, Fig, 2), amphibole-biotite gneisses of the Belomorsk Archaean series are widely developed around the intrusion.
1987, Fig. 1). plagioclasites. Rhythmic layering involves alternation of leucocratic layers composed essentially of plagioclase and melanocratic layers of pyroxene, olivine and titanomagnetite. The nepheline syenites, the central area of which covers about 10 km 2 , also form dykes and veins which intersect the layered gabbroid series and also the accompanying dyke rocks (dolerite and spessartite). The nepheline syenites comprise nepheline, microcline and aegirine with lesser arfvedsonite, biotite, apatite, zircon, titanite, ilmenite, titanomagnetite and spessartine.
The principal ore types are ore olivinites, ore pyroxenites and ore-amphibole pyroxenites. , 1981) . , 1993). , 1965. Monchiquite, tinguaite and -#t++ItHt ijolite porphyry dykes -....... Cancrinite syenite - ' - Nepheline syenite Ir I ~ • Carbonatite and aegirine-calcite rocks Ijolite pegmatite and urtite " " " Biotite and pyroxene,i' ,," II' biotite schists 1======j Ijolite-urtite and urtite -+-- Vertical foliation 21 LESNA YA V ARAKA ~ ~ Melteigite D Nepheline pyroxenite D Fenltized Archaean gneiss _ - Fault - - - - Fenite contacts ~ Gently dipping foliation Fig.