STRUCTURE AND EVOLUTION OF THE EARTH’S CRUST IN THE REGION OF JUNCTION OF THE CENTRAL ASIAN FOLD BELT AND THE SIBERIAN PLATFORM: SKOVORODINO–TOMMOT PROFILE
A.N. Didenko, A.S. Efimov, P.A. Nelyubov, A.S. Sal’nikov, V.S. Starosel’tsev, B.F. Shevchenko, M.V. Goroshko, V.A. Gur’yanov, N.G. Zamozhnyaya
Keywords: Reference depth profiles, deep structure, tectonics, paleoreconstructions, Central Asian Fold Belt, Siberian Platform
Abstract
An integrated geological and geophysical study was performed to investigate the region of junction of the eastern part of the Central Asian Fold Belt and the Siberian Platform in the Skovorodino–Tommot 3-DV reference profile line (52°–60° N, 122°–129° E), where the belt is separated from the Aldan–Stanovoi Shield of the platform by a series of deep faults. The main results are as follows: Seismic, density, and geoelectric characteristics of rocks were obtained and used to determine (refine) the intracrustal boundaries of tectonic structures; large-block structure of the Earth’s crust, caused by mantle faults, and the difference between the layered structure of the crust for the shield and fold regions were established; and available paleomagnetic data were used to perform palinspastic reconstructions for 180 and 140 million years, the most productive metallogenic epoch in the region, coeval with collision processes at the closure of the Mongol-Okhotsk paleobasin.
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