DOI: 10.5593/SGEM2014/B11/S1.027


V. Shchiptsov
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-07-0 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 1, 215-222 pp

Considerable clusters of high-alumina rocks are confined to the Meso-, Neoarchean and Paleoproterozoic complexes of the Fennoscandian Shield. Examples in Karelia are sillimanite (kyanite and andalusite)-, corundum-, staurolite-, anorthosite- and nepheline syenite-group deposits and occurrences. High-alumina industrial minerals consist of highly altered rocks produced by the metamorphism and ultrametamorphism of volcanogenic, volcanic-sedimentary and sedimentary rocks and intrusive magmatism. The origin and distribution of metamorphogenetic ores depend on on their genetic relation to one or another type of regional metamorphism, associated magmatism and hydrothermal-metasomatic alterations. Various metamorphogenetic complexes of high-alumina composition are widespread in Karelia, especially kyanite ores in the Belomorian mobile belt and in the North Karelian greenstone belt, where they were formed in polymetamorphic complexes under favourable metamorphic conditions corresponding with the Belomoriam-Lapland, high-pressure kyanite-sillimanite and Belomorian high-pressure kyanite types of metamorphism (after V.A.Glebovitsky). The Khizovaara kyanite field is an example of a big unit. Associated with the alumina formation of the Svecofennian folded region are the andalusite and staurolite occurrences of the Pälkjärvi suite, Ladoga series (Kalevian). The corundum occurrences of the Belomoriam mobile belt form two types, depending on their being confined to rocks of various lithological compositions: type 1 – corundum-bearing rocks in the kyanite-garnet-biotite plagiogneisses of the Chupa paragneiss complex (Khitostrov and Varatskoe); type 2 – corundum-bearing rocks in metabasic rocks (Dyadina Gora and Notozero). Of great practical importance is the Kotozero anorthosite massif of the Belomorian mobile belt. The main ore-forming mineral is plagioclase which varies in composition from An52 to An74 and its concentration ranges 70 to 95%. Miaskite-type alkaline and nepheline syenites are common to the central part of the Yeletozero pyroxenite-gabbro alkaline massif, where they constitute a body which covers an area of 10 km2. Thus, the potential of the area, where several types of alumina raw materials occur, is considerable.
Keywords:high-alumina complex, industrial minerals, Precambrian, Fennoscandian Shield.

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