Vol. 337 No. 5 (2026)

DOI https://doi.org/10.18799/24131830/2026/5/5186

Technology of 3D density modeling of the upper crust of the Voronezh crystalline massif

Relevance. Construction of three-dimensional models of the lithosphere structure based on interpretation of geophysical data is an urgent task at the present stage of development of geophysics. Aim. Development of technology for three-dimensional density modeling of the upper part of the earth crust based on inversion of the gravity field. Methods. The technology consists of a stage of preliminary regional constructions of a generalized geological and geophysical model of the earth crust for the study area. These data made it possible to exclude the gravitational effect of the sedimentary cover, estimate the thickness of the "gravity-active" layer of the crystalline basement and calculate a regional density model of the lithosphere based on solving the inverse problem in a spherical formulation. At the stage of detailed modeling, the regional density model and the corresponding regional gravity field serve as the basis for constructing a density model of the upper part of the earth crust of the studied region. The inverse problem for local gravity field anomalies caused by density heterogeneities in the upper crust is solved in Cartesian coordinates using the approximation operator of the normal solution for the horizontal layer. The iterative solution scheme is developed for the data on the real relief of field observations and uses a modified method of local corrections. The final detailed density model of the upper part of the earth crust is presented in absolute values of density on a regular plan grid with a step of 2 km and a discrete grid of layers, the thickness of which regularly increases with depth from 0.05 to 4 km. The choice of the grid for solving the inverse gravimetry problem is consistent with the adopted accuracy of the solution and the characteristic sizes of the sought geological heterogeneities. The depth of the lower boundary of the model layer is 16 km. Results. The developed technology is applied to create a detailed density model of the upper crust of the eastern part of the Voronezh crystalline massif. Conclusions. The proposed method of constructing three-dimensional density models of platform territories, based on the density measurements of sedimentary and surface parts of crystalline rocks, as well as assessments of their predicted distribution at depth, allows us to form a fundamentally new multi-stage approach to interpreting gravimetry data. The data on three-dimensional density distribution obtained on the basis of the technology, fully consistent with a large volume of a priori geological and geophysical information, allow us to obtain fundamentally new knowledge about the deep geological structure of the study area.

For citation: Voronova T.A., Muravina O.M., Glaznev V.N., Antonova I.Yu. Technology of 3D density modeling of the upper crust of the Voronezh crystalline massif. Bulletin of the Tomsk Polytechnic University. Geo Assets Engineering, 2026, vol. 337, no. 5, pp. 160-175. https://doi.org/10.18799/24131830/2026/5/5186

Keywords:

three-dimensional density modeling, gravitational field, inverse problem, earth crust, Voronezh crystalline massif, geological structures of the crystalline basement

Authors:

Tatyana A. Voronova

Olga M. Muravina

Viktor N. Glaznev

Irina Yu. Antonova

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