Summary
A helicopterborne geophysical survey was completed in the South Pasvik area near the border with Russia. The primary target formation was the Gjøkvatn Formation which extends into Norway from Russia, and which is known to host nickel mineralization of the Russian side. The survey was commissioned by A/S Sulfidmalm, with liason and supervision carried out by Falconbridge Nickel Mines. The total area surveyed covered approximately 80 square kilo- meters at a line spacing of 100 meters, for a total of approximately 800 line kilometers. The instrument package included a four frequency helikopter electromagnetic system, magnetometer, VLF, and spectrometer. Results are presented as a series of colour geophysical maps, with a report on the radio- metric results planned to follow. A preliminary geologic interpretation has been made based on the geophysical data as well as petrophysical measurement. The geophysical data indicates that the Blankvatn gneiss constitutes a dome structure with the Gjøkvatn Formation stratigraphically above and folded to the north of it. Several sets of faults are evident on both the magnetic and resistivity maps, and small high intensity magnetic anomalies in the Gjøkvatn Formation are interpreted to be due to serpentinites. They seem to be located near the contact of the two units.
