TITLE:
Magnetic Structure of the Earth’s Crust in the White Sea Region
AUTHORS:
Lyubov Bakunovich, Mikhail Nilov, Nikolay Sharov, Boris Belashev
KEYWORDS:
White Sea, Earth’s Crust, Anomalous Magnetic Field, Effective Magnetic Sus-ceptibility, 3D Model
JOURNAL NAME:
International Journal of Geosciences,
Vol.12 No.11,
November
12,
2021
ABSTRACT: The geological structure of the White Sea area and the
surrounding land areas has been well studied in the framework of individual
case studies. There are a number of local models of the deep structure of the
Earth’s crust available. We propose a uniform assessment of deep crustal bodies
responsible for long-period (regional) magnetic anomalies and consider their
correlation with surface structures. The aim of the study is to build a
three-dimensional magnetic model of the Earth’s crust in the White Sea region
using aeromagnetic data and modeling technologies of the Integro software
package. The model is formed on the basis of a digital map of the anomalous
magnetic field reduced to the pole. The sources of magnetic anomalies are
considered to be located in the Earth’s crust. The 3D distribution of the relative
magnetic susceptibility of rocks was obtained by solving the inverse problem of the magnetic survey. To separate
the magnetic sources by frequency and depth, it was necessary to continue the
magnetic field of the model upward and to calculate the TDR derivatives, which
determine the lateral boundaries of the sources of positive magnetic field
anomalies. 2D distributions of magnetic sources of the model for vertical and
horizontal sections with depths of 10, 15 and 20 km are analyzed. The
correlation between the surface and deep structures of magnetic sources of the
Earth’s crust in the region is shown.