All methods of determining magnetization directions and J/G attribution of arbitrarily shaped sources that involve the combined use of gravity and magnetic anomalies.
With the introduction of highly sensitive quantum magnetometers into the practice of aeromagnetic survey, the range of problems solved with the use of this economical and mobile method has sharply expanded. In particular, the first aerial surveys with this equipment, carried out in platform regions, showed that within the sedimentary cover, previously considered practically non-magnetic, lie some horizons of terrigenous rocks, creating magnetic anomalies AT, the amplitude of which is several nanotesla.
In the processing of high-precision aeromagnetic survey materials, conducted to study the sedimentary cover of platforms and identify structural complications in it, widely used various transformations, anomalous field, designed to weaken the anomalies that are caused by the basement rocks.
Folded structures, including anticlines, are revealed by magnetic imaging due to the presence of magnetic marking horizons or strata in them. It is quite common to find anticlinal folds, in the section of which there is only one such horizon.
To increase the reliability of geological interpretation of aeromagnetic survey materials, often with the help of various transformations try to isolate from the anomalous field component associated mainly with a certain depth interval of magnetic rocks ...
To solve the formulated problem, the magnetic field is usually used along a single profile passing over the center of the ball and through the extrema of the anomaly Z ...
Anomalies characteristic of the horizontal plate are most often observed in platform regions. Their sources are usually relatively low thicknesses of terrigenous (sometimes volcanogenic) rocks, the distribution of which in the plan is limited by discontinuities or zones of sharp facies transitions ...
The introduction of high-precision quantum magnetometers into practice has significantly expanded the range of tasks for which magnetic reconnaissance is used. Large volumes of aeromagnetic surveys are performed, in particular, to identify fold structures in sedimentary strata of platforms and geosynclinal areas in connection with the search for oil and gas ...
The structural plan of the Precambrian is characterized by a wide development of the so-called dome-like structures - gneiss-migmatite domes, in the central parts of which the most intensively granitized rocks are exposed. When mapping such structures in recent years widely and successfully used materials of airborne and ground magnetic surveys. ...
Detailed geologic mapping of sedimentary rock strata based on ground magnetic survey data and solution of structural problems in the areas of their development is sharply limited until now. This is explained by the usually very low magnetization of sedimentary formations, their weak differentiation by magnetic properties and gentle bedding, which is characteristic of the territory under consideration. ...
Located in the northwest of the Kola Peninsula, the Pechenga structure is a large synclinal fold composed of alternating sedimentary and volcanogenic strata.
When conducting magnetic surveys, anomalies are often revealed, the nature of which quite clearly reflects the influence of the lower boundary of magnetized bodies of formation form. The use of anomalous magnetic roll to estimate the possible dip distribution of such bodies and to determine the dip angle may be important in prospecting and exploration of many ore deposits, solving various structural problems.
The specificity of the problem under consideration is that the analytical expressions of the Za and ∆T fields include not the dip angles themselves, but some auxiliary angles (respectively, v and e), which depend not only on the direction and dip angle, but also on the inclination of the magnetization vector and the azimuth of the formation strike.
