GEOLOGICAL INFORMATION OF MAGNETIC PROPERTIES OF GRANITOIDS OF THE PRECEMBRIAN BASEMENT OF UKRAINIAN SHIELD (ON THE EXAMPLE OF THE MELNIKOVTSY PLOT)

Abstract

In Ukraine, there are all possibilities for the development of geophysical methods for solving the problems of mapping the Precambrian foundation, as there is a well-exposed Ukrainian Shield (US). The article shows the possibilities of the magnetic scanning method for geological mapping, on the example of a section composed of granitoids with xenoliths of crystalline shales. The magnetic field and magnetic susceptibility on exposures are «scanned» in detail. Two positive anomalies of the magnetic field with a similar fine internal structure have been identified. The results of the study showed that granitoids have low magnetic properties that do not allow the formation of positive anomalies of the magnetic field. It is assumed that the source of «toothed» positive anomalies of the magnetic field in the studied section of the US can be two parts of one layered geological body — with a rhythmic internal structure composed of crystalline shales. It is possible that the body was awakened by local tectonic processes and torn into parts that are significantly displaced, and even lie almost parallel in the study area.