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Aeromag 1999

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Description of an aeromagnetic survey in Greenland 1999
AGS Greenland - Intro page
The Aeromag 1999 survey covered the southern West Greenland, from 65o40'N to 68o20'N and from the coast to the Inland Ice.

The Aeromag 1999 survey covers an area consisting of Archaean and Proterozoic crystalline rocks, including the southern part of the Nagssugtoqidian orogen and its southern foreland. The Nagssugtoqidian orogen consists mostly of reworked Archaean gneisses with supracrustal rock sequences and Palaeoproterozoic intrusives. All rocks of the orogen were metamorphosed under upper amphibolite to granulite facies, while the Archaean foreland rocks escaped the Nagssugtoqidian metamorphic overprint and have preserved their Archean granulite facies mineralogy. Prior to the Nagssugtoqidian orogenesis the foreland and the southern part of the orogen were intruded by the mafic Kangâmiut dyke svarm.

The region covered by Aeromag 1999 project has latelybeen in focus with respect to diamond and base metal exploration.

Survey area Southern West Greenland.
Period Flown from May 17th to September 6th, 1999.
Survey specifications The survey includes measurements of the magnetic total field.

The regular line direction was north-south with orthogonal tie-lines. The regular lines had a sparation of 500 metres whereas the tie-lines were flown with a spacing of 5000 metres. A total of 141 009 line-kilometres were acquired.

Survey terrain clearance is 300 metres (draped).

Areal extent 61 292 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
    • Total magnetic intensity contours
    • First vertical derivative of the total magnetic intensity
    • Shadow of the total magnetic intensity
    • Combined colour and shadow of the total magnetic intensity
    • Topography

Two maps in scale 1:250 000 and 60 maps 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 Rasmussen & van Gool 2000; O´Connor 1999.
Further information Contact GEUS, Department of Petrology and Economic Geology, at petromalm@geus.dk.
The type-anomaly from the Sarfartoq carbonatite complex. The centre of the complex is marked by a high magnetic field caused by the presence of magnetite. The surrounding magnetic low is caused by hydrothermal alteration of the host rocks.
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