The Neotectonic Stress–Strain State of the Southern Side of the Kandalaksha Graben

In the course of fieldwork in 2019–2021 on the southern coast of the White Sea, the authors of the article collected representative material for tectonophysical research—measurements of spatial orientation of geological stress indicators: sliding mirrors, separation, veins and fractures. To analyze the collected material, a complex of tectonophysical methods was applied, namely, the method of cataclastic analysis of discontinuous displacements, the structural-paragenetic method, the structural-geomorphological method and the SimSGM program, fracture analysis. Data on the stress state throughout the Kuzokotsky Archipelago and the adjacent territories of the Great Salma Strait were obtained. By the method of cataclastic analysis, 10 local stress states were obtained, 11 by the structural-paragenetic method, and 10 by the structural–geomorphological method. On the territory of the Kindo Peninsula, Veliky Island, and the Kuzokotsky Archipelago, local stress states of different ages have been reconstructed, which were tied to the tectonic history of the Kandalaksha graben. Variations of stress-strain states for different sites are revealed. And a hypothetical model of the gradual evolution from the north-west compression to the north-east during the latest tectonic stage is proposed. Local stress conditions confirm the presence of transtension conditions in the axial part of the rift structures of the Great Salma Strait. The identification of voltage sources made it possible to update the history of the development of the Kandalaksha graben. According to the expanded database of fracturing and other geological stress indicators, it will be possible to reach regional geodynamic regimes, which in turn is useful for predicting earthquakes.

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