A new model of the earth crust structure from results of the control source electromagnetic soundings

It is suggested to subdivide the Earth's crust into two parts – upper, brittle crust (namely geological) and lower, ductile crust (namely physical). The upper crust of 10-15 km thickness is the most actively involved in geological processes. Its principal peculiarities are: the sharp horizontal heterogeneity of electrical properties, a wide range of variations of specific electrical resistivity from 1 to 105 Ohm·m, a high porosity, brittleness, and a presence of fluids that drain the supra structure from the day surface owing to penetrate of meteoric waters to the depths up to 5-10 km. The lower crust (physical) belongs to the depth interval from 10-15 to 35-45 km (up to the Moho boundary). It is remarkable by the horizontal homogeneity of electrical properties and high specific electrical resistivity in the range of 105-106 Ohm·m, by the low porosity and increased ductility. Electrical conductivity of the lower crust is mostly determined by the influence of planetary physical-chemical parameters (pressure, temperature, viscosity), phase transitions of substances and geodynamic peculiarities of evolution for different segments of the Earth crust. As an area of physical processes influence, the low crust is nearer by its origin to the Upper mantle then to the geological Upper Earth crust.