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TO STUDY THE DISTRIBUTION OF ORE CLUSTERS OF THE AMUR RIVER REGION MINEROGENIC PROVINCES WITH THE DEEP STRUCTURE FEATURES OF THE UPPER CRUST ON THE EAST-STANOVOY FRAGMENT OF THE REFERENCE GEOLOGICAL AND GEOPHYSICAL PROFILE 8-DV
V. M. Solovyev 1, A. S. Salnikov 2, V. S. Seleznev 3, T. V. Kashubina 4, N. A. Galyova 1
1 Altai-Sayan Branch of Federal Research Center United Geophysical Survey RAS, Novosibirsk, Russia; 2 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 3 Seismological Branch of United Geophysical Survey RAS, Novosibirsk, Russia; 4 Russian Geological Research Institute, Saint Petersburg, Russia
The results of deep seismic studies based on P- and S-wave data on the East-Stanov fragment of the reference 700-kilometer geophysical profile 8-DV are presented. Deep seismic sections of the upper crust (up to depths of 20 km) with velocity distribution of longitudinal and transverse waves are constructed. The velocity of P-waves in the upper part of the section varies from 4-5 km/s within the Upper Zeya and Amur-Zeya plains to 5.5-6.0 km/s within mountain ranges and plateaus. According to S-waves in the upper part of the section, the velocity values are generally 3.0-3.2 km/s; reduced velocity values of 2.5-2.6 km/s are noted in the Upper Zeya Plain section. The inhomogeneous structure of the upper part of the Earth’s crust to depths of 15-20 km has been established by the ratio of the velocities of P- and S-waves and the Poisson’s ratio. In the section of the profile, an analysis was made of the relationship between the identified anomalies and the location of large mineragenic zones of the Amur region. The correlations previously identified on the profiles 2-DV, 3-DV and 1-SB on the occurrence of a number of ore deposits in the zones of reduced ratios of P- and S-wave velocities and Poisson’s ratio in the upper part of the Earth’s crust have been confirmed. The connection of the identified surface seismic anomalies with deep roots (at depths of 5-20 km), which can be considered ore-bearing, is substantiated.
Keywords: GSZ profile, longitudinal and transverse waves, P- and S-wave velocities and their ratios, deep seismic section, Earth’s crust, minerogenic zone.
DOI 10.20403/2078-0575-2022-3-72-84