Abstract
The geothermal characteristics of Mongolia are presented based on heat flow measurements taken in boreholes and at the bottom of Lake Khubsugul, and on heat flow values inferred from 3He/4He isotope ratios in spontaneous spring gases. Three types of regional heat flow distribution are recognized: a narrow linear anomaly in the Khubsugul segment of the Baikal rift zone, an area of regularly varying heat flow controlled by the age of the last tectonomagmatic activity in Central Mongolia, and a zone of anomalously low heat flow in the South Mongolian Hercynian belt. The radiogenic contribution to the terrestrial heat flow is determined, a contribution which proved to be different in the southern and northern megablocks of Mongolia. Variations in the thermal regime of the northern (central) and southern megablocks of Mongolia are accounted for by their tectonic evolution.
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