Abstract
One of the measurement geophysical methods to investigate kimberlite pipes is by using the magnetic method. The acquired field data in this study uses two proton-precession magnetometers for the mapping of magnetic anomalies due to kimberlites. Three different magnetic maps are obtained from the result of total magnetic field data processing on Oásis Montaj software programme. These maps include magnetic anomaly maps through statistical analyses, total magnetic field intensity map and map of the analytic signal. Based on the interpretation of these maps a structure is identified with SWW-NEE directions in which magnetic signatures that indicate the presence of kimberlite pipes are observed. As the interpretation of the magnetic anomalies is a complicated process due to their dipolar nature, the analytic signal is generated, where is possible to observe the typical shape of these anomalies.
Highlights
The magnetic method is the oldest and has been one of the most widely used geophysical prospectings to study the Earth’s subsurface since the method was first applied to find buried, iron ore deposits [1] [2]
Three different magnetic maps are obtained from the result of total magnetic field data processing on Oásis Montaj software programme
There are many researches related to magnetic anomalies, the purposes of this paper are 1) to describe how magnetic method was employed in Luando area to map the total magnetic field and 2) to create a typical analytic signal map in the study area with a detailed interpretation
Summary
The magnetic method is the oldest and has been one of the most widely used geophysical prospectings to study the Earth’s subsurface since the method was first applied to find buried, iron ore deposits [1] [2]. It is known that kimberlites are ultrabasic igneous rocks, which normally occur as pipes, dikes or sills. Despite they are the major source of the world’s diamonds [4]; only one percent of kimberlite pipes hold an economic deposit of diamonds [5]. There are many researches related to magnetic anomalies, the purposes of this paper are 1) to describe how magnetic method was employed in Luando area to map the total magnetic field and 2) to create a typical analytic signal map in the study area with a detailed interpretation. In order to achieve the purpose of this research, the study started with a brief overview of Luando area and an aeromagnetic survey was conducted in the study area, which allowed the understanding of the orientation of the main structures. The area is relatively humid tropical region of the equatorial zone, which the relative humidity varies between 35% - 40% in dry weather and 75% - 80% in rainy weather, and it is covered mainly by tall trees
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