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Electrical Conductivity and Fluid Distribution in the Koryak–Kamchatka Region

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Abstract—The three-dimensional (3D) interpretation of magnetotelluric (MT) data in the Koryak–Kamchatka region with interactive fitting of 3D model MT curves and magnetovariational matrices to their measured analogs is used to construct geoelectric sections of the upper part of the lithosphere. Based on the obtained sections, aqueous fluid fraction and melt fraction in the crust and upper mantle is estimated. Fluid saturation is determined with the allowance for temperature and pressure growth with depth for the rocks saturated with NaCl brine with concentrations 100 or 170 g/L. The degree of fluid mineralization is specified based on the P-wave velocity distributions obtained by deep seismic sounding and tomography. Fluid fraction and mantle melt fraction are estimated from the simplified Shankland–Waff formula (modified Archie’s law). The maximum fluid and melt fractions are characteristic of the lithospheric blocks located within seismically and volcanically most active structures and within regional faults cutting these structures. The blocks with high melt and fluid fraction are spatially correlated with the domains of low P-wave velocities.

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ACKNOWLEDGMENTS

The work is based on the material presented in the reports of OAO Kamchatgeologia and VNIIGeofizika. I am grateful to the staff of these organizations for providing these data.

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  1. Geoelectromagnetic Research Centre, Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia

    V. V. Belyavskii

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Belyavskii, V.V. Electrical Conductivity and Fluid Distribution in the Koryak–Kamchatka Region. Izv., Phys. Solid Earth 57, 492–507 (2021). https://doi.org/10.1134/S1069351321040030

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