Crustal thermal models for South Siberia |
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| Authors: | L S Sokolova A D Duchkov Reviewer V ?ermák |
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| Institution: | (1) Institute of Geology and Geophysics, Siberian Branch of the USSR Acad. Sci., Novosibirsk |
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| Abstract: | Summary The results of geothermal research carried out in South Siberia (West-Siberian and Siberian Platforms, Altai-Sayan folded area and the Baikalian arched uplift zone) were employed to calculate the Earth's crustal temperatures. It is shown that temperature is a function of the heat flow value. The maps of the surface heat flow and the temperatures at the Moho discontinuity are presented and characteristic temperature-depth profiles were compiled for specific tectonic areas. The West-Siberian and Siberian Platforms, as well as the Altai-Sayan folded region are characterized by rather low heat flow, 42–50mW m
–2
(1.0–1.2 µcal/cm
2
s), and low temperatures at the Moho boundary.400–500 °C. The thermal conditions in the area of Lake Baikal are extreme, the heat flow reaches here100–142 mW m
–2
(2.4–3.4 µcal/cm
2
s), and the temperature at the crust's bottom may exceed1000 °C. The Moho-surface according to our calculations is nonisothermal. |
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| Keywords: | |
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