MAIK “Nauka /Interperiodica ” (Russia). STATE OF THE PROBLEM AND GOALS OF INVESTIGATION
sion is located in the Eastern Onega region within the Vodlozero block of the Karelian granite–greenstone terrane in the central part of the Burakovo–Monastyr permeable zone and intrudes the Early Archean tonalite–amphibolite complexes and Late Archean gneissic granites [1]. This is the largest laye...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.623.8867 http://geo.web.ru/~ariskin/docs/papers/p03_063en.pdf |
| Summary: | sion is located in the Eastern Onega region within the Vodlozero block of the Karelian granite–greenstone terrane in the central part of the Burakovo–Monastyr permeable zone and intrudes the Early Archean tonalite–amphibolite complexes and Late Archean gneissic granites [1]. This is the largest layered intru-sion in Europe more than 630 km 2 in area on the present-day erosion level. The massif is nearly com-pletely overlain by thick Quaternary deposits. In plan, it forms a NE-trending body (Fig. 1). The NW-trending faults divide the massif into three blocks: Burakovo (southwestern), Shalozero (central), and Aganozero (northeastern). Geological–geophysical investigations [2, 3] showed that the intrusion is lopolithic in shape and can be subdivided into two seg-ments: a trough-shaped one consisting of the Burakovo and Shalozero blocks, and the funnel-shaped Aganoz-ero block. The gravimetrically deduced map of the massif floor relief is shown in Fig. 1 (inset). The maxi-mum bottom depth of the intrusion is observed in the funnel-shaped Aganozero block with a thickness of>8 km. The floor of the trough-shaped part of the mas-sif is as deep as 7.5 km in the Burakovo block and 6.5 km in the Shalozero block. Geological–geophysical data [4] indicate sharp contacts of the massif with host rocks, with steeper southern and southeastern contacts (45 |
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