CRUSTAL SEISMIC-REFLECTION PROFILING IN ROMANIA ON THE URZICENI-MIZILLINE

This work presents the interpretation of a deep seismic reflection pro file recorded in the northern extremity of the Moesian Platform. The s eismic time section and the reflectivity histogram show the presence o f two distinct zones: good reflectivity in the upper part for the sedi mentary overburden, and a continuous decrease of reflectivity with dep th for the deeper part (crystalline zone). A correlation between the r eflectivity of the crust, the age of the platform and heat flow was al so established. The decrease in the crustal reflectivity (mainly for t he lower crust) could be due to both a temperature decrease and higher viscosity, favouring a brittle behaviour. The presence of these facto rs could explain the lack of continuity of the reflections. A crustal model based on the seismic time section is also presented and shows a thickening of the crust from south to north.