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MAGNETIC ANOMALIES INTERPRETATION AND EARTH'S CRUST MAGNETIZATION MODEL OF THE NETHER-POLAR AND POLAR URALS

Petr Martyshk

Abstract

We performed a study of the anomalous magnetic field features of the Nether-Polar and Polar sectors of the Urals (48-72В° E and 60-68В° N). We identified and mapped magnetic anomalies due to the Earth's crust layers. The calculated local magnetic anomalies map allows allocating basic-ultrabasic massifs in the upper parts of the basement within the sedimentary basins. After regional magnetic anomalies interpretation and deep seismic sounding data along profiles, located in the study area we build an Earth's crust structure model. Comparison of the deep structure of the cross-sections produced by independent interpretation methods using seismic and magnetic data has enabled us to extract two layers with different magnetic properties from the consolidated crust. The top layer of the Earth's crust does not make a significant contribution to the regional magnetic field and is characterized by a low magnetization (less than 0.3 A/m). We identified magnetized local sources within this layer. The lower layer has greater crustal magnetization. As a result of the two-dimensional modeling of the value of the magnetization of the basalt layer of the crust is 3-4 A/m. The average depth to the top surface of the layer is 18-20 km. The resulting parameters were used for three-dimensional modeling. We considered a model with uniform magnetization directed along the modern geomagnetic field. Thus, we built the upper surface of the magnetized layer, which allowed clarifying mafic layer in the space between the deep seismic sounding profiles. It was found that at the Northern, Circumpolar and Polar Urals basalt layer plunged to a considerable depth of 26-30 km.

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DOI resolver: doi.org/10.5593/sgem2018/1.1/s05.108

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