Mantle Diapir Model in the Baikal Rift Zone

Abstract

As part of deep-water monitoring of the vertical electric field component E_z, long-term observations of magnetic field variations on land in the southern basin of Lake Baikal were also conducted. These observations were used to calculate gradient functions between the reference point (Patrona Observatory) and existing magnetic measurement points over periods ranging from 5.6 min to 24 h. These data were used to compare with model calculations when considering various models of the geoelectric structure of the Baikal Rift Zone (BRZ). The characteristic features of the mantle diapir structure are most pronounced in the southernmost part of the BRZ, with a boundary along the Main Sayan Fault. In general, the diapir structure is sharply asymmetric, with the feeder conduit located under the northwestern periphery of the mantle body. The position of the southeastern boundary of the body requires refinement by expanding the monitoring network.