Abstract
A new high sensitivity aeromagnetic survey covering approximately 145 000 km2 of the lnland Ice (fig. 14) has been carried out during two periods of field operations in AprilIMay and September 1983. It is the first time a systematic, high sensitivity aeromagnetic coverage over the Greenland lnland Ice has been achieved. This note briefly reports on the background of the project, the fieId operations, and the preliminary results. Previous aeromagnetic surveys of ice-free regions of central and southern West Greenland (Thorning, 1976, 1977, and in prep.) have shown that many major geological boundaries are clearly reflected in the aeromagnetie data acquired over these regions. Geological field work in south-east Greenland has revealed the existence of similar geological boundaries, but their assumed position under the lnland lce has so far been guesswork. The aeromagnetic survey reported here is intended to provide real information on regional struetures under the lnland lce between the two coastal areas.
Highlights
Introduetion A new high sensitivity aeromagnetie survey covering approximately 145 000 km2 of the lnland Ice has been carried out during two periods of field operations in AprilIMay and September 1983
Previous aeromagnetic surveys of ice-free regions of central and southern West Greenland (Thorning, 1976, 1977, and in prep.) have shown that many major geological boundaries are c1early reflected in the aeromagnetie data acquired over these regions
The westernmost lines were flown over areas of central and southern West Greenland, which have been surveyed previously (Thorning, 1976, 1977), and as an example of the continuity of the data, the trend indicated on fig. 16 can be pointed out
Summary
Safety regulations and the range of the aircraft allowed 4 to 5 hours' flight time for each sortie. A total of 104.5 flight homs were used on 21 sorties. 18 600 line km of aeromagnetic data were acquired in a regular net of 51 N-S lines 9-11 km (12' of longitude) apart, and five tie lines (fig 14). 14 is a compromise between the geological objeetive of the survey and the time and resourees available. Because of the limited time available in the field (a little over three weeks), it was not possibie to adhere strictly to a specification for diurnal activity. No doubt there are cases, where diurnal noise has contaminated the airborne data, but the processing will probably be able to deal with that. Most days the diurnal conditions happened to be fair to good
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