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Ilchenko V. L., Kaulina T. V., Nerovich L. I.
Petrophysical properties of rocks and ring morphology of the probable impact Yarva-Varaka structure (Monchegorsk ore area of the Kola Region)
DOI: 10.21443/1560-9278-2026-29-1-5-15
Abstract. The morphology and physical properties (density, longitudinal wave velocities, and elastic anisotropy) of rock samples collected from the surface of the J?rva-Varaka site within the boundaries of the proposed astrobleme have been studied. Morphological analysis allows us to define the J?rva-Varaka structure as a multi-ring elliptical structure with a maximum diameter of approximately 10 km. The ring topography, although not reflecting the primary crater morphology, is associated with selective erosion caused by the concentric tilting of rock strata as a result of the meteorite impact. The largest variations in the physical properties of gneisses and granitoids are observed between the 2nd and 3rd rings of the structure. In most cases, a direct correlation is observed between density, longitudinal wave velocity, and anisotropy. Significant areal variations in the petrophysical properties of granitoids and gneisses, which represent the target rocks, have been established. Elastic anisotropy proved to be the most informative parameter. Within the ring structure, granitoids and gneisses exhibit increased anisotropy, while outside the ring, they often exhibit low to moderate anisotropy. Studying the petrophysical properties of the 2.5 Ga Jarva-Varaka astrobleme provides useful information that can be used in future searches and studies of ancient meteorite craters.
Printed reference: Ilchenko V. L., Kaulina T. V., Nerovich L. I. Petrophysical properties of rocks and ring morphology of the probable impact Yarva-Varaka structure (Monchegorsk ore area of the Kola Region) // Vestnik of MSTU. 2026. V. 29, No 1. P. 5-15.
Electronic reference: Ilchenko V. L., Kaulina T. V., Nerovich L. I. Petrophysical properties of rocks and ring morphology of the probable impact Yarva-Varaka structure (Monchegorsk ore area of the Kola Region) // Vestnik of MSTU. 2026. V. 29, No 1. P. 5-15. URL: https://vestnik.mauniver.ru/v29_1_n107/01_lchenko_5-15.pdf.
