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AEM Greenland 1998 (1) - Washington Land and Daugaard Land

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Description of an airborne combined electromagnetic and magnetic survey in Greenland 1998 (1)

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The AEM Greenland 1998 (1) survey was conducted in Washington Land and Daugaard-Jensen Land in western North Greenland.

The AEM Greenland 1998 project also included a second survey area, J.C. Christensen Land in eastern North Greenland and some reconnaissance lines in eastern Peary Land - click here to see AEM Greenland 1998 (2).

During a GEUS geological reconnaissance campaign in eastern Washington Land in 1997, a Zn-Pb-Ag mineralisation was discovered in dolomitic boulders in the area. The discovery led to the selection of Washington Land and Daugaard-Jensen Land as one of the target areas in North Greenland for a combined airborne electromagnetic (GEOTEM) and magnetic survey.

Lower Palaeozoic sedimentary deposits dominate the geology of Washington Land and Daugaard-Jensen Land. The sediments were deposited in the Franklinian Basin that has an extension of approximately 2000 km across North Greenland and Canada. Approximately 8 km of Lower Palaeozoic strata are exposed within the North Greenland part of the basin. In Washington Land and Daugaard-Jensen Land the depositional environment of the basin is reflected in shelf sediments located to the south and deep-water sequences further to the north. Exposed rocks in the survey area consist mainly of carbonates deposited on the former shelf with subordinate siliciclastic sediments and evaporites.

The Zn-Pg-Ag mineralisation is found within the evaporite-rich part of the Lower Ordovician platform sediments.

Survey area Washington Land & Daugaard-Jensen Land in western North Greenland.
Period Flown from May 29th to June 24th, 1998.
Survey specifications The survey includes electromagnetic (GEOTEM) and magnetic total field measurements.

Two surveys were acquired. The main survey was flown with a flight line spacing of 400 metres between lines with a heading of NW23.5o and tie-lines at a direction of NE66.5o spaced 4 km apart. Within this area, a smaller survey in the eastern part directly over the mineralised sites were measured at 200 m line spacing (NE66.5o).

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

Areal extent 3220 km2
Acquisition and processing Geoterrex-Dighem Ltd.
Data and maps
  • Digital line and grid archives on CD-ROM
  • Multi-channel stacked profiles - one plot per flight line showing all measured / calculated parameters
  • Maps of the following parameters:
    • EM anomalies with flight path
    • Total magnetic intensity
    • Calculated vertical magnetic gradient
    • Apparent conductance
    • Z-coil channel 10 amplitude

Maps produced includes one map in scale 1:250 000, covering the whole survey area for each of the listed parameters and 13 maps at scale 1:50 000. For the detailed area around the Zn-Pg-Ag mineralization one map in scale 1:20 000 was produced for each the listed parameters.

Example of maps
Products available from GEUS Digital data with survey report and maps - see How to order products.
Financed by Government of Greenland.
Selected references Geoterrex-Dighem 1998a;  Rasmussen 1999a;  Rasmussen & Thorning 1999.
Further information Contact GEUS, Department of Petrology and Economic Geology, at petromalm@geus.dk.
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