Aeromag 1996

Description of an aeromagnetic survey in Greenland 1996

AGS Greenland -Intro page

The Aeromag 1996 project covered a large part of South-West Greenland. The main geological units in the survey area are the Archean craton to the north and the Palaeoproterozoic Ketilidian orogen to the south, where most of the survey area lies within in the Archean craton. The Archean craton of Greenland is the largest and best exposed craton of the North Atlantic cratons. It consists mainly of granitoid quatzo-feldspathic gneisses probably largely derived from acid to intermediate igneous rocks, but encompasses also rafts of amphibolites. There are many occurrences of supracrustal rocks of varying age within the surveyed area, however, the Tartoq group in the southern part of the Aeromag 1996 project area is the best known of the supracraustal sequences. Most of the craton experienced serveral phases of folding, faulting and/or metamorphism, often in granulite facies. The Fiskenæsset complex is situated within the Aeromag 1996 project area, near its northern boundary. It is a stratiform intrusion covering an area of approximately 2500 km2 containing anorthosites, leucogabbro and gabbro with minor amounts of ultramafic rocks and chromite. The Fiskenæsset complex and has been dated to approximately 2800 Ma. In the southern part of the Aeromag 1996 project area the Archean gneisses are at places unconformably overlain by well preserved undeformed and unmetamorphosed Palaeoproterozoic sediments and basic volcanic rocks. Further to the south these sediments become strongly deformed and metamorphosed by the Palaeoproterozoic Ketilidian orogenic belt. This is the 'Border Zone' between the Archaean craton and the Palaeoproterozoic Ketilidian orogen. See also Aeromag 1995.
	Survey area South Greenland. Period Flown from June 3th to September 14th, 1996. Survey specifications The survey includes measurements of the magnetic total field. The regular survey lines are oriented N37oW and spaced at 500 metres intervals. Tie-lines were flown at 5000 metres intervals in an orthogonal direction to the regular survey lines. The survey consists of 67 277 line-kilometres covering 28 366 km2. Survey terrain clearance is 300 metres (draped). Aeral extent 30 026 km2 Acquisition and processing Geoterrex Ltd. Date and maps Digital line and grid archives on CD-ROM Maps of the following parameters: Flight lines Total magnetic intensity contour Total magnetic intensity contour and colour map First vertical derivative Two maps in scale 1:250 000 and 35 map sheets in scale 1:50 000 were produced for the listed parameters. Examples of maps Magnetic total field Vertical gradient of magnetics Products available from GEUS Digital data with survey report and maps - see How to order products. Financed by Jointly by the Governments of Denmark and Greenland. Selected references Allen 1997; Thorning & Stemp 1997. Further information Contact GEUS, Department of Economic Geology, at malm@geus.net.

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