STRUCTURE OF THE ZEYA BLOCK OF TOKIN STANOVIK according to RESULTS OF MAGNETOTELLURIC SOUNDING
V.B. Kaplun
Yu.A. Kosygin Institute of Tectonics and Geophysics, Far East Branch of the Russian Academy of Sciences, ul. Kim Yu. Chena 65, Khabarovsk, 680000, Russia
Keywords: Магнитотеллурические зондирования, глубинное строение, Сибирская платформа, Становой разлом, Magnetotelluric soundings, deep structure, Siberian Platform, Stanovoi fault
Abstract
The paper describes the results of magnetotelluric sounding (MTS) carried out in the Zeya block of the Stanovoi megablock, in the area of its junction with the Aldan Shield. The border between them runs along the Stanovoi fault. Based on the results of interpretation of MTS curves and the gravity, magnetic, and geological data, the geological/geophysical sections have been constructed to a depth of 7 km along two ~20 km long profiles running across the Stanovoi fault. About 1 km thick and approximately 2 km long conductivity zone has been distinguished beneath the Okonon plateau of Quaternary basalts with electrical resistivity of less than 100 Ohm·m. This anomaly is associated with ore mineralization confined to Early Proterozoic gabbro intrusion. A 3D density modeling was performed. The northeastern dip of high-density bodies to a depth of 25 km is observed at the northwestern strike in the area of the Okonon basalt plateau.
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