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Aeromag 1992

Geological Survey of Denmark and Greenland (GEUS) 		GEUS logo - link to main page

Description of an aeromagnetic survey in Greenland 1992
AGS Greenland - Intro page
The Aeromag 1992 project covered Lersletten area in central West Greenland, just south of the southern edge of Disko Bay and the small village Ikamiut.

The geology of the area is not known in great detail because of limited field work . The area is situated within the Nagssugtoqidian mobile belt of the Precambrian Laurentian shield. The rocks of the Nagssugtoqidian belt consist mainly of Archaean basement, gneisses and supracrustal sequences, which have been reworked during Proterozoic time. Volcanic and plutonic rocks of Proterozoic juvenile origin, as well as Proterozoic supracrustal metasediments are also described. The tectonic structure of the Nagssugtoqidian is characterised by strong ENE linear trends, at places developed into steep belts with very strong shearing and sinistral displacement.

Several massive to semi-massive sulphide horizons in supracrustal sequences are identified and have been classified as sedimentary stratiform deposits.

Survey area Lersletten, central West Greenland.
Period Flown from June 20th to July 5th, 1992.
Survey specifications The survey includes measurements of the magnetic total field.

The regular survey lines are oriented north-south with 1 kilometre spacing and perpendicular tie-lines with 10 kilometres spacing. A total of 10 062 line-kilometres were flown.

Survey terrain clearance is 515 metres.

Areal extent 8610 km2
Acquisition and processing Geoterrex Ltd.
Data and maps
  • Digital line and grid archives on CD-ROM
  • Profile in horizontal scale of 1:100 000 displaying different measured parameters
  • Maps of the following parameters:
    • Flight path
    • Total magnetic intensity contour
    • Vertical gradient contour
    • Combined qualitative and quantitative interpretation
    • Magnetic total field colour
    • Magnetic vertical gradient colour

Maps produced includes one map in scale 1:250 000 and four maps in scale 1:100 000 for the parameters listed covering the whole survey area.

Example of maps
Products available from GEUS Digital data with survey report and maps - see How to order products.
Financed by The Government of Denmark with a contribution from Nunaoil A/S.
Selected references Schacht 1993; Thorning 1993.
Further information Contact GEUS, Department of Petrology and Economic Geology, at petromalm@geus.dk.
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