Abstract
The objective of project NAD is to map the continental margin of East Greenland, using high sensitivity aeromagnetic surveys and multichannel seismic refIection and marine gravity and magnetic surveys, and to prepare a preliminary petroleum geological assessment of the region on the basis of all the available data. The aeromagnetic surveys were carried out during 1979 (Larsen & Thorning, 1980). Marine geophysical surveys are planned for 1980, 1981 and 1982 (Risum, 1980). During 1980 a total of 2610 km of marine geophysical data were collected and the processing and interpretation of the aeromagnetic data acquired in 1979 was continued.
Highlights
The objective of project NAD is to map the continental margin of East Greenland, using high sensitivity aeromagnetic surveys and multichannel seismic refIection and marine gravity and magnetic surveys, and to prepare a preliminary petroleum geological assessment of the region on the basis of all the available data
The analog data in the form of maps and profiles were delivered to GGU in the period from January to April 1980
The delivery of the digital data in GGU format was delayed until September 1980 due to a computational error by Aero Service in the conversion
Summary
The compilation of the aeromagnetic data collected in 1979 (Larsen & Thorning, 1980) was completed during 1980 by Aero Service Division, Western Geophysical Company of America, Houston. The scale of the maps is 1:250000 (with photo-composites scale 1:500000) and the scale of the CalComp profiles is l: 125 000. The analog data in the form of maps and profiles were delivered to GGU in the period from January to April 1980. At the time of writing the digital data are being entered into GGU's aeromagnetic data base, and will be ready for computer aided interpretation (Thorning, 1980) by February 1981. The high quality of the new data has been confirmed, and many striking and reliable features suitable for geological and geophysical interpretation are present in both the old and the new data (see Larsen & Thorning, 1980). On the basis of the analogue data, a study of the oldest oceanic anomalies between 60° and 700N has been carried out (Larsen & Jacobsen, submitted), indicating that the major part of the outer shelf north of about 65°N rests on oceanic basement formed along the northward extension of the early Reykjanes Ridge
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