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Aeromag 1997

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Description of an aeromagnetic survey in Greenland 1997
AGS Greenland - Intro page
The Aeromag 1997 project was conducted over the Disko-Nuussuaq region of central West Greenland. The survey area was located both onshore and offshore.

The easternmost part of the survey area is dominated by Precambrian basement terrain, while the westernmost part which includes offshore areas, is dominated by Tertiary basalts.

The Precambrian terrain consist of orthogneisses, intercalated with units of strongly deformed Archaean supracrustal rocks which comprise both metavolcanic and metasedimentary rocks where local gold occurrences have been found. Most of the region was overprinted by early Proterozoic deformation and metamorphism.

A detailed investigation of a 400 square km area off-shore the eastern coast of Disko Ø was flown in 1998, in order to map a circular shaped anomaly.

Airplane with tail mounted magnetometer over snow covered mountains in Greenland.
Survey area Disko-Nuussuaq region, central West Greenland.
Period Flown from May 12th to July 25th, 1997.
Survey specifications Magnetic total field measurements.

The regular line direction was north-south with tie-lines east-west. The easternmost part of the survey area was flown with a line spacing of 500 metres, while the westernmost part of the survey area was flown with a line spacing of 1000 metres. Control lines were flown with a spacing of 5000 metres. A total of 70 630 line-kilometres were acquired.

Survey terrain clearance is 300 metres (draped).

Areal extent 46 390 km2
Acquisition and processing Sander Geophysics Ltd.
Data and maps
  • Digital line and grid archives on CD-ROM
  • Maps of the following parameters:
    • Flight lines
    • Total magnetic intensity with contour lines
    • First vertical derivative of the total magnetic intensity
    • Shadow of the total magnetic intensity
    • Combined colour and shadow of the total magnetic intensity
    • Combined colour and shadow of the first vertical derivative of the total magnetic intensity

One map in scale 1:500 000, two maps in scale 1:250 000 and 35 map sheets in scale 1:50 000 were produced for the parameters listed.

Examples of maps
Products available from GEUS Digital data with survey report and maps - see How to order products.
Financed by The Government of Greenland.
Selected references Murphy & Coye 1997; Thorning (in press).
Further information Contact GEUS, Department of Petrology and Economic Geology, at petromalm@geus.dk.
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