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AEM Greenland 1995

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

Description of an airborne combined electromagnetic and magnetic survey in Greenland 1995

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AGS Greenland - Intro page
The survey area is located in the Maniitsoq-Nuuk area of southern West Greenland, in the northern part of the Archaean gneiss complex of West Greenland. Much of the available detailed geological information is based on commercial exploration companies and GEUS field mapping.

The AEM Greenland 1995 project had four main objectives:

  • Detailed exploration of the "norite belt", to locate massive sulphide targets
  • Detailed exploration over a portion of the survey area to locate possible kimberlite pipes and dikes
  • Locate massive sulphide targets within the Archaean greenstone belts
  • Enhancement of the geological database of the Maniitsoq-Nuuk area

In addition to the main survey block, some additional reconnaissance lines were flown to provide information for future planning. Two lines 600 metres apart were extended to the ice cap from the eastern survey boundary and four lines were flown in an east-west direction across Nordlandet, south of the survey block.

The geophysical data have been used by GEUS and by exploration companies for exploration of kimberlites.

The GEOTEM transmitter loop fixed at the nose of the aircraft.
Survey area Maniitsoq-Nuuk area of southern West Greenland.
Period Survey flown from 15th July to 11th September, 1995.
Survey specifications The survey includes electromagnetic (GEOTEM) and magnetic total field measurements.

Nominal flight line spacing is 400 metres with 200 metres spacing in the norite belt and kimberlite test area. Control lines were correspondingly spaced at four kilometres and two kilometres intervals. A total of 20 446 linekilometres were flown.

Nominal flight altitude is 120 metres over terrain with the total field magnetic sensor and the electromagnetic sensor 75 metres and 70 metres above ground, respectively.

Areal extent 5235 km2
Acquisition and processing Geoterrex Ltd.
Data and maps
  • Digital line and grid archives on CD-ROM
  • Multi-parameter profiles displaying selected channels at a horizontal scale of 50 000
  • Maps of the following parameters:
    • Residual Magnetic Intensity
    • Calculated Vertical Gradient of Magnetics
    • EM anomlies (with Flight Path)
    • Total Energy Envelope of GEOTEM channel 1
    • Apparent Conductivity of Z-coil channel 20
    • Landsat TM Image

Geophysical maps for the central section of the main survey (200 metres line spacing) were produced at scales of 1:20 000 and 1:50 000. Maps of the remaining survey area (400 metres line spacing) were produced at 1:50 000 only. A single map sheet of 1:250 000 scale was produced for the entire survey area.

Examples of maps
Products available from GEUS Digital data with survey report and maps - see How to order products.
Financed by Government of Greenland with contribution from Cominco Ltd. (approx. 25% of the survey costs).
Selected references Sharp 1996; Stemp, R.W. 1996a; Stemp, R.W. 1996b.
Further information Contact GEUS, Department of Petrology and Economic Geology, at petromalm@geus.dk.
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