Abstract
In the present work, on the base of theoretical calculations and experimental data the transition boundary of the earth’s crust from the brittle to ductile state (BDT boundary) has been studied. The results of theoretical calculations show that the position of the BDT boundary varies widely - from 5–10 to 30–40 km depending on those or other a priori (indirect) data. The use of experimental estimates allows clarifying the position of the BDT boundary. In this case, the assumption was taken that the BDT boundary coincides with the conditional “impenetrability” boundary, or else with the boundary of a sharp increase in the electrical resistivity of rocks, establishing at the depths of 10–15 km based on the results of electromagnetic soundings on direct current. Results of the deep MHD-sounding “Khibiny” and the deep DC soundings on the Murmansky block from car generator and on the Russian platform from the Volgograd-Donbass DC power transmission line were taken as the main source of experimental information.
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Acknowledgments
This work was done with financial support of RFBR grant 18-05-00528 (rheology section) and partly with the support of the State Mission GI KSC RAS, the number of research 0226-2019-0052 (geoelectric section). The authors are deeply grateful to the lead programmer T. G. Korotkova for her help in processing of results.
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Shevtsov, A.N., Zhamaletdinov, A.A. (2019). On the Rheological and Geoelectrical Properties of the Earth’s Crust. In: Zhamaletdinov, A., Rebetsky, Y. (eds) The Study of Continental Lithosphere Electrical Conductivity, Temperature and Rheology. SPS 2018. Springer Proceedings in Earth and Environmental Sciences. Springer, Cham. https://doi.org/10.1007/978-3-030-35906-5_8
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