THE DEEP STRUCTURE OF THE UPPER PART OF THE EARTH'S CRUST ALONG THE PROFILE OF V. MEDVETSKOYE – V. TOGUCHIN ACCORDING TO THE RESULTS OF MAGNETOTELLURIC STUDIES
E.V. Pospeeva1, V.V. Potapov1
1Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch Russian Academy of Sciences (IPGG SB RAS) Novosibirsk, Russia
Keywords: Salair cover-folded structure, Kolyvan-Tomsk folded region, Khmelevsky trough, Doroninskaya depression, geoelectric horizon, geoelectric structure, magnetotelluric sounding
Abstract
The results of magnetotelluric studies on the Medvetskoye–Toguchin settlement profile, located in the interface zone of the southern margin of the West Siberian Plate and its mountain-folded rim, the Altai-Sayan folded region, are considered. The profile intersects elements of three large tectonic structures: the Salair cover-folded structure, Gorlovskiy trough, and Doroninskaya Depression. The main differences in the geoelectric structure of these structures, as well as the blocks isolated within them, are shown. The conductive heterogeneity identified in the Earth's crust of the Salair ore zone is considered as a promising area with the highest probability of detecting indigenous deposits of endogenous genesis. The areas of increased electrical resistivity (3*103 ohms·m) detected
at a depth
of about 1000 m
in the territory of East Salair
are interpreted as granitoid
intrusions of the Zhernovsky complex.
They are located on
the continuation in the northern
direction of the axis of the roof
projections of a large batholith
of the Zhernovsky complex of Late Permian age.
In spatial
connection with these
granitoids, manifestations of geochemical anomalies
of tin, lead, zinc
and other
elements are found.
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