Exploration and Modelling of Basaltic Rocks and a Maar Depression

Abstract

Magnetic and gravimetric measurements have been carried out in Lusatia in Eastern Germany. Here a old geological massiv comprising granodiorits, graywacks and lower paleocoic sediments exist. The boundaries are characterized by big tectonic faults in western, northern and southern parts. In Tertiaery basaltic vulcanism appears in connection with young movements. The objective of our research was to explore known and hidden basaltic intrusions by magnetic methods. Gravity measurements were carried out to find the thickness of overlying loose sediments. An estimation of the magnetic susceptibility from basaltic rocks reaching the surface was made as well. We found the figure and the depth of the basaltic intrusions by 2-3/4D forward modelling. Most of the rocks are showing remanent magnetic behaviour. A maar depression was detected and interpreted by joint inversion of gravity and magnetic anomalies.