Tracing of a Potential Seismic Structure in the Taryat Basin of Central Mongolia by Volcanic Eruptions from an OIB-like Source at 50–9 Ka

Abstract

The youngest volcanoes of Central Mongolia that erupted in the Taryat basin are described. Change of the west-east line of the Odnobokiy, Listvennichny, and Sosnovy volcanoes (age about 50 Ka) by the one of edifices of the northeastern strike of the Khorgo volcano (age about 9 Ka) is established. This change is considered as a prototype of a seismically active structure in the Chulutyn zone. From geochemical data on volcanic rocks, volcanic eruptions are argued to be from a homogeneous OIB-like source that episodically reactivated in the Taryat-Chulutyn volcanic field starting from 1.2 Ma ago. Sources of this type differ from those of the crust-mantle transition region, which are characterized by a significant spatial-temporal variability of components.