Abstract
An important task for the White Sea region, Russia’s second largest diamond-producing province, is the search for magmatic bodies overlapped by sedimentary cover via magnetometer survey. The models, linking local and magnetic anomalies with their sources, are essential for interpretation of search results. The aim of the study is to build a 3D magnetic model of the Earth’s crust for the White Sea region using aeromagnetic data and the modeling technologies of the Integro software package. The simulation is basing on a digital map of the pole-reduced anomalous magnetic field. The sources of magnetic anomalies are believed to be located in the Earth’s crust. The researchers obtained 3D distribution of the relative magnetic susceptibility of rocks by solving the inverse problem of magnetic prospecting. To separate the magnetic sources by spatial frequencies and depth, the model magnetic field was recalculated upward, as well as the TDR derivatives, which determine the lateral boundaries of the sources of positive magnetic field anomalies, were calculated. The researchers further analyzed 2D distributions of the magnetic sources of the model for vertical and horizontal sections with depths of 10, 15 and 20 km, thus proving the relationship between the surface and deep structures of the magnetic sources of the Earth’s crust in the region.
Highlights
An important task for the White Sea region, Russia’s second largest diamond-producing province, is the search for magmatic bodies overlapped by sedimentary cover via magnetometer survey
The simulation is basing on a digital map of the polereduced anomalous magnetic field
To separate the magnetic sources by spatial frequencies and depth, the model magnetic field was recalculated upward, as well as the TDR derivatives, which determine the lateral boundaries of the sources of positive magnetic field anomalies, were calculated
Summary
1. Схема Белого моря и прилегающих территорий с расположением основных тектонических линеаментов земной коры: 1 — тектонические границы блоков, 2 — внутриблоковые тектонические нарушения, 3 — государственная граница Fig. 1. В связи с высокой проникающей способностью магнитного поля разработка петромагнитных моделей глубинного строения недр являлась актуальной на протяжении всего периода активного геологического изучения региона. История формирования представлений о глубинном строении Белого моря и прилегающих территорий, в том числе с использованием аэромагнитных данных, описана в [3]. Статья продолжает цикл работ авторов по изучению земной коры Белого моря и прилегающих территорий [5; 6]. Цель исследования — создание и анализ с помощью комплекса «Интегро» 3D магнитной модели земной коры Белого моря и прилегающих территорий
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