ГЕОЭКОЛОГИЯ


ИНЖЕНЕРНАЯ ГЕОЛОГИЯ. ГИДРОГЕОЛОГИЯ. ГЕОКРИОЛОГИЯ

Geoekologiya, 2018, Vol. 1, P. 58-67

ELASTIC-ANISOTROPIC PROPERTIES OF ROCKS OF DIFFERENT COMPOSITION AND METAMORPHIC FACIES IN THE NORTHEAST OF BALTIC SHIELD

F.F. Gorbatsevich, O.M. Trishina, M.V. Kovalevskii

Geological Institute, Kola Research Centre, Russian Academy of Sciences,
ul. Fersmana 14, Apatity, Murmansk oblast, 184209 Russia.

 E- mail: gorich@geoksc.apatity.ru

Using rocks composing the Matert Fm of the Pechenga complex in the sections of the Kola superdeep borehole (SG‐3) and the Finnish borehole Outokumpu, massifs in the vicinities of Lake Chudzjavr and the River Tuloma, xenoliths from the volcanic pipe (Elovy Island) as an example, petrographic features, metamorphism and physical properties of rocks from the prehnite‐pumpellyite to the granulite facies were studied. The study showed that the rock densities increase from the prehnite‐pumpellyite to the amphibolite facies (Earth’s surface). The density of rocks under deep conditions increases from the prehnite‐pumpellyite to the granulite facies. The lowest velocities of compression waves are observed in rocks of the epidote‐amphibolite and amphibolite facies (Earth’s surface). This can be explained by formation of secondary metamorphic minerals and weathering processes. Velocities as well as densities under deep conditions tend to increase from the prehnite‐pumpellyite to the granulite facies. Rocks of the amphibolite facies are most anisotropic.

Key words: metamorphism, facies, physical properties of rocks, acoustopolariscopy method, Pechenga complex, Kola superdeep borehole, Finnish Outokumpu drill hole.

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