THE OKA PLATEAU IN THE NEOTECTONIC FRAMEWORK OF SOUTHERN EAST SIBERIA
G. F. Ufimtsev and V. G. Nemchinov
Keywords: Neotectonics, Cenozoic gedynamics, intermontane area, rift zone, tectonic relief, basement surface, hotspot
Pages: 979-987
Abstract
The Oka plateau exists as a moderately elevated (2400 m) intermontane area bounded by the major East Sayan dome, the Main Sayan Fault, and the Baikal Rift system, in the zone of the rift strike break. The plateau, which has a block structure, and its surroundings show specific features of recent geodynamics, including seismicity and distribution of Cenozoic basalts. These specific features are related to the position of the region over a hotspot swell along 100 E, which corresponds to a column of low-density material connecting a sublithospheric asthenolith with the lower mantle.
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