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A model of the deep structure of the Earth’s crust and upper mantle in the area of the Karymshinsky gold-ore cluster according to geophysical data (South Kamchatka)

A.G. Nurmukhamedov, M.D. Sidorov, Yu.F. Moroz

Original article

DOI https://doi.org/10.18599/grs.2020.1.63-72

63-72
rus.
eng.

open access

Under a Creative Commons license

In the South of Kamchatka, modern geodynamic processes are actively taking place. A deep geological and geophysical model of the structure of the Earth’s crust and upper mantle along the regional profile of the Apacha Village-Mutnaya Bay in the zone of Tolmachevsky active magmatic center is presented. The profile passes near the South-Western border of the Karymshinskaya volcano-tectonic structure (VTS) and crosses the Ahomtenskaya VTS. The model created on the basis of integrated interpretation of materials of the earthquake converted-wave method (ECWM), gravity and magnetotelluric sounding (MTS). The thickness of the Earth’s crust along the profile varies from 30-33 km at the edges reaching 44-46 km, in its central part. The dominant feature of the model is a high-density formation – a block of the Earth’s crust, saturated with intrusions of the main and ultrabasic composition. The formation of the block is associated with a permeable zone between the crust and the upper mantle. In the block correlation of seismic boundaries is disturbed and in a density model the area with massive heterogeneity is allocated. A significant increase in depth to the M-Boundary in the center of the model is explained by the presence of a “bloated” transition layer between bark and mantle in this place. The thickness of the layer is about 10 km, and the density of the mantle reaches 3.4 g/cm3. It is assumed that this is a site of eklogization of breeds in a zone of paleosubduction of oceanic lithosphere under a continental. The area is favorable for the accumulation of meteor waters, which are in contact with high-temperature environment and postmagmatic solutions of intrusions, which leads to the formation of hydrothermal systems. The genetic connection of Karymshinsky gold-ore cluster with the intrusive array of medium-sour composition, allocated in the zone of the Tolmachevsky active Magmatic Center is shown.

 

crust, upper mantle, transition layer, deep model, heat flow, ECWM, MTZ, South Kamchatka

 

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Alexandr G. Nurmukhamedov
Scientific Research Geotechnological Centre of the Far Eastern Branch of the Russian Academy of Sciences30, Severo-Vostochnoe highway, 683002, Petropavlovsk-Kamchatsky, Russian Federation
 
Mikhail D. Sidorov
Scientific Research Geotechnological Centre of the Far Eastern Branch of the Russian Academy of Sciences30, Severo-Vostochnoe highway, 683002, Petropavlovsk-Kamchatsky, Russian Federation
 
Yury F. Moroz
Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences
9, Piip boul., Petropavlovsk-Kamchatsky, 683006, Russian Federation
 

For citation:

Nurmukhamedov A.G., Sidorov M.D., Moroz Yu.F (2020). A model of the deep structure of the Earth’s crust and upper mantle in the area of the Karymshinsky gold-ore cluster according to geophysical data (South Kamchatka). Georesursy = Georesources, 22(1), pp. 63-72. DOI: https://doi.org/10.18599/grs.2020.1.63-72