Geology & Ore 3: Airborne geophysical data from Greenland

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Beskrivelse

In Greenland, compared to the rest of North America and Europe, the use of airborne geophysical surveys as a basic tool in mineral exploration came fairly late. During the early 1970s the first public airborne surveys were carried out in East Greenland, followed in the mid seventies in West and South Greenland. As for most surveys at the time, the earliest data, magnetic and radiometric, were acquired in digital form but positioned visually by tracking photography. In the eighties, experimental surveys with ve,y wide spacing of lines (10-12 km) were carried out over the southern part of the Inland Ice. Since 1992, systematic digital airborne geophysical programmes have been conducted in many parts of Greenland, now taking advantage of modern positioning techniques, e.g. GPS. At the beginning of the new millennium substantial parts of Greenland have been covered by magnetic, electromagnetic and radiometric surveys using a methodology practical for exploration companies. New methods based on airborne hyperspectral scanning have been introduced and used in selected areas.