Elastic-anisotropic properties of rocks of different composition and metamorphism facies in the northeast of the Baltic shield

Using the rocks composing the Matert Fm of the Pechenga complex as an example, geological features, metamorphism and physical properties of rocks from the prehnite-pumpellyite to the amphibolite facies were studied. The acoustopolariscopy method was used to evaluate elastic anisotropy, experimental determinations of the density, compression and shear wave velocities under laboratory conditions were made. The mineral composition was used to calculate the density and velocity characteristics for deep conditions of the rock occurrence. The study of rocks of different facies of metamorphism showed that the parameters of physical properties in situ increase from the prehnite-pumpellyite to the amphibolite facies.