Ascending Heat and Mass Flow in Continental Crust: on the Problem of Driving Forces of Tectogenesis

The geophysical and geochemical indicators of the ascending heat and mass flow in the continental crust—conductive heat flow through the surface of the crust and the isotopic composition of helium in freely circulating underground fluids—are considered. The tectonic ordering of the heat flow and the...

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Bibliographic Details
Published in:Izvestiya. Physics of the solid earth 2020-07, Vol.56 (4), p.490-510
Main Authors: Polyak, B. G., Tolstikhin, I. N., Khutorskoi, M. D.
Format: Article
Language:English
Subjects:
Chemical composition
Composition
Continental crust
Density
Earth and Environmental Science
Earth Sciences
Flow distribution
Fluid flow
Fluids
Gases
Geological sections
Geophysics/Geodesy
Heat flow
Heat transfer
Heat transmission
Helium
Isotope composition
Isotopes
Mass flow
Stability
Strontium
Tectonics
Volcanic activity
Volcanic gases
Volcanism
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Summary:The geophysical and geochemical indicators of the ascending heat and mass flow in the continental crust—conductive heat flow through the surface of the crust and the isotopic composition of helium in freely circulating underground fluids—are considered. The tectonic ordering of the heat flow and the factors responsible for the dispersion in its density ( q ) are discussed. The sources and reservoirs of terrestrial helium are characterized; the stability of 3 Не/ 4 Не ratio in the geological section along the depth and in time is demonstrated; linear and areal variations in this ratio on different scales are revealed and their similarity with heat flow distribution is established. The correlations of helium isotopic composition in freely circulating underground fluids with the conductive heat flow density and helium composition in gases in the regions of recent volcanism as well as with strontium composition in young lavas indicate helium transport from the mantle to the crust by the magmatic melts.
ISSN:1069-3513
1555-6506
DOI:10.1134/S1069351320030088