TIME-DOMAIN ELECTROMAGNETIC SOUNDINGS AND SELF-POTENTIAL SURVEYS IN THE OLKHON REGION: RESULTS AND GEOLOGICAL INTERPRETATION PROBLEMS
https://doi.org/10.5800/GT-2025-16-6-0868
EDN: FEXQJJ
Abstract
Priolkhonye, as part of the Olkhon region, is a unique geological testing ground where the structures of the the basement parts of the Siberian craton and the Central Asian Foldbelt are exposed on the modern erosional surface. The understanding of the structure of this region primarily comes from the ground-based geological mapping and remote sensing results. However, the applicability of remote sensing technologies in the study of the Priolkhonye region structure is limited, especially in depth extrapolation of the results. Therefore, it is essential to use geophysical methods that enable three-dimensional geological mapping. This article presents and discusses the results of studying the regional geological structure of Priolkhonye using transient (time-domain) electromagnetic sounding and self-potential methods. These studies have revealed for the first time the features of the regional-scale structure of Priolkhonye that do not come to light during the ground-based geological survey. An important result of the studies is that they yield questions concerning the geological interpretation of the geophysical data, which cannot yet be answered unambiguously under the current concept of the geological structure of Priolkhonye.
Keywords
Priolkhonye,
time-domain electromagnetic sounding method,
self-potential method,
geoelectric model,
shear zones,
graphite
Supporting agencies: The study was carried out on the state assignment of the Trofimuk Institute of Petroleum Geology and Geophysics SB RAS (project No. FWZZ-2022-0024).
About the Authors
N. O. Kozhevnikov
Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Competing Interests:
Russian Federation
Academician Koptyug Ave, Novosibirsk 630090
Competing Interests:
The authors declare that they have no conflicts of interest relevant to this manuscript.
Yu. A. Agafonov
SIGMA-GEO LLC
Russian Federation
Competing Interests:
Russian Federation
6 Zvezdinskaya St, Irkutsk 664039
Competing Interests:
The authors declare that they have no conflicts of interest relevant to this manuscript.
D. S. Polishchuk
SIGMA-GEO LLC
Russian Federation
Competing Interests:
Russian Federation
6 Zvezdinskaya St, Irkutsk 664039
Competing Interests:
The authors declare that they have no conflicts of interest relevant to this manuscript.
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Review
For citations:
Kozhevnikov N.O., Agafonov Yu.A., Polishchuk D.S. TIME-DOMAIN ELECTROMAGNETIC SOUNDINGS AND SELF-POTENTIAL SURVEYS IN THE OLKHON REGION: RESULTS AND GEOLOGICAL INTERPRETATION PROBLEMS. Geodynamics & Tectonophysics. 2025;16(6):868. (In Russ.) https://doi.org/10.5800/GT-2025-16-6-0868. EDN: FEXQJJ
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