By L. N. Kogarko, V. A. Konova, M. P. Orlova, A. R. Woolley (auth.)
Alkaline rocks and carbonatites have the main assorted and severe compositions of all igneous rocks. This quantity describes all of the recognized occurrences within the former USSR.
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Extra info for Alkaline Rocks and Carbonatites of the World: Part Two: Former USSR
About 75 dykes have been located up to several kilometres to the south. Sudovikov (1946) has distinguished two groups of dykes: (1) melteigite, which is represented by fenitized porphyries and (2) syn- and post-melteigite dykes of nephelinite, monchiquite and foyaite. The country rocks are granite gneisses and amphibolites of the Belomorsk Archaean series and these have been intensively fenitized. Age From its geological position, petrographic composition and geochemistry the complex is considered to be part of the Elet'ozerskii complex and thus 1800-1900 Ma.
All rocks, including the carbonatites, are intersected by thin dykes of monchiquite. The calcite carbonatites of the ring-shaped zone and veins contain 75-80 % calcite together with natrolite, cancrinite, phlogopite, aegirinediopside and secondary chlorite. The accessories include apatite, titanite, magnetite, zircon, pyrochlore, hydroxyapatite, ancylite and parisite. The dolomite-ankerite carbonatites also contain dolomite, rhodochrosite and baryte in the crust of weathering; they are also enriched in hematite, psilomelane, pyrolusite, aragonite and strontianite.
Australian National University Press, Canberra. K. 1942. On the age of the pyroxenitic intrusions of Africanda and Ozernaya Varaka on the Kola peninsula. izvestiya Akademii Nauk SSSR, 35: 168-9. GINSBURG, AN. G. 1978. Tantalum and niobium deposits. USSR ore deposits, 3: 341-2. Nedra, Moscow. B. G. 1981. The Precambrian carbonatitic complex of the Azov region. Naukova Dumka, Kiev. 227pp. S. N. 1981. Mineral deposits of the Kola Peninsula. Nauka, Leningrad. 272 pp. B,. BELOUSOY, E. A. 1981. Geology and metallogeny of the Kostomuksha ore deposit region.
Alkaline Rocks and Carbonatites of the World: Part Two: Former USSR by L. N. Kogarko, V. A. Konova, M. P. Orlova, A. R. Woolley (auth.)