Badania magnetyczne w Polsce dla potrzeb regionalnego rozpoznania geologicznego

Abstract

Geological results of region al magnetic investigations in Poland In the first period of regional geological prospection of Poland a few absolute magnetic measurements were carried out. On this basis A. Tornquist (1910) determined the location of the south-western border of the East-European Platform. Later on this location was determined in a more detailed way by S. Pawłowski (1947). The next step of the investigations comprised the analysis of the results of regional measurements of the Z component of the Earth’s magnetic field executed by the Geological Institute in the years 1937—1956. These results were used for the preparation of several maps of the Z component by the staff of the Department of Geophysics of the Geological Institute. The analysis of the above results permitted to distinguish the principal elements of the magnetically active basement in the area of Poland by A. Dąbrowski and K. Karaczun (1958). The quoted authors prepared a map of isohypses of the roof of the magnetically active basement in north-eastern Poland, which corresponds in most cases to the roof of crystalline rocks of Proterozoic and Archaic age. Other versions of this map were prepared by S. Pawłowski (1958) and by J. Skorupa (1959), while S. Małoszewski (1961) published a tectonic map of north-eastern Poland, based upon magnetic data. All the above authors utilized also magnetic data for inferences on the pétrographie composition of the basement rocks. Seismic investigations and drilling operations carried on subsequently confirmed in most cases the hypotheses based upon the analysis of the magnetic data. Also the line of the deepest occurrence of the magnetically active basement determined by J. Jankowski (1967) on the basis of records of changes of the variable magnetic field is consistent with the results of analysis of the magnetic map.