New PDF release: Alkaline Rocks and Carbonatites of the World: Part Two:

By L. N. Kogarko, V. A. Konova, M. P. Orlova, A. R. Woolley (auth.)

ISBN-10: 9401042284

ISBN-13: 9789401042284

ISBN-10: 9401105138

ISBN-13: 9789401105132

Alkaline rocks and carbonatites have the main assorted and severe compositions of all igneous rocks. This quantity describes all of the identified occurrences within the former USSR.

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Extra resources for Alkaline Rocks and Carbonatites of the World: Part Two: Former USSR

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J with zeolites Ijolite-urtite pegmatite with apatite and schorlomite -+- Vertical layering 1=-q;-'2:~1 -- ,~" mm D ~ Urtites (a unaltered; b phlogopitised) Ijolite and melteigite Melteigite Country rocks Dip and strike of layering Fig. 31. , 1965, Fig. 165). 66°48'N; 30 0 07'E Fig. 32 This complex occurs within the gneisses and migmatites of the Belomorskaya Archaean series where the latter is associated with a Proterozoic sedimentary and volcanogenic sequence. The intrusion, the total area of which is about 20 km 2 , has an eIIiptical shape and a concentrically zoned structure, which is described in detail by Kapustin (1976).

37 ELISENV AARSKII (Kaivimyaki and Raivimyaki) 61 °25'N; 29 °55'E Fig. 37 Two areas of outcrop of alkaline gabbroic rocks and syenites, called Kaivimyaki and Raivimyaki, which are surrounded by fenites, appear to represent parts of a single, larger occurrence with an area of about 30 km 2 • They are located within the approximately north-southtrending deep-seated fracture zone of Western Preladoga. Here in an area 20 km long and about 5 km wide occur outcrops of alkaline gabbro ids and syenites, as well as related fenites, the last consisting of albite, microcline, phlogopite, hasting site and apatite.

This occurrence is located on a number of small islands in Kovdozero Lake. 5 km across several islands, and these rocks are sometimes distinguished by the presence of orbicular structures. 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.

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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.)

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