AEM Greenland 1998 (2) - J.C. Christensen Land

Description of an airborne combined electromagnetic and magnetic survey in Greenland 1998 (2)

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The survey area for AEM Greenland 1998 (2) is located in the north-eastern J.C. Christensen Land, eastern North Greenland, with additional reconnaissance lines in eastern Peary Land, North Greenland. The AEM Greenland 1998 project also included a second survey area, Washington Land and Daugaard-Jensen Land, western North Greenland - click here to see AEM Greenland 1998 (1). Predominantly sedimentary rocks are exposed in North Greenland. Basin developments are separated by episodes of deformation caused by compressional loading of the crust. Crystalline basement rocks of early Proterozoic and Archean age crop out at the head of Victoria Fjord, but basement rocks have not been located in J.C. Christensen Land. A volcanic unit with widespread occurrence east of Independence Fjord intruded a thick sequence of undeformed Proterozoic sandstones. Rock outcrops in J.C. Christensen Land are controlled by a number of faults. The strikes of the faults are dominantly north-easterly and west-south-westerly; they are considered to be of importance in relation to the Cu-mineralizations reported at several locations within the area. The reconnaissance lines in eastern Peary Land covers the boundary between the Franklinian Basin and the Permian Wandel Sea Basin, which is intersected by a large number of faults. At Citronen Fjord in Peary Land a significant Pb-Zn mineralization was discovered by Platinova A/S in 1993. The mineralization is located in the Ordovician Amundsen Land Group of the Franklinian Basin and is interpreted to be of sedimentary-exhalative type. The overall base metal resource is estimated at 20 million tons stratiform ore of 7% zinc, including 7 million tons containing 9% zinc and 1% lead.
	Survey area J.C. Christensen Land and reconnaissance lines in eastern Peary Land, eastern North Greenland. Period Flown from May 29th to June 24th, 1998. Survey specifications The survey includes electromagnetic (GEOTEM) and the magnetic total field measurements. The survey was flown with lines directed along NE45.8o and distance between lines of 400 metres. Orthogonal tie-lines were flown with a line separation of 4000 metres. A total of 4492 line-kilometres were collected. In total 485 line-kilometres were flown in eastern Peary Land as reconnaissance lines. Nominal flight altitude is 120 metres over terrain with the total field magnetic sensor and electromagnetic sensor 75 metres and 70 metres above ground, respectively. Areal extent 1603 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 listed parameters: EM anomalies with flight path Total magnetic intensity Calculated vertical magnetic gradient Apparent conductance Z-coil channel 10 amplitude One map in scale 1:250 000, covering the whole survey area, was produced for the listed parameters. At scale 1:50 000 eight maps were produced. A map in scale 1:250 000 with EM anomalies and flight path was produced for eastern Peary Land. Examples of maps Magnetic total field Vertical gradient of magnetics GEOTEM Z channel 10 amplitude Conductance from X- and Z-coils Digital terrain model Products available from GEUS Digital data with survey report and maps - see How to order products. Financed by Government of Greenland. Selected references Geoterrex-Dighem1998b; Rasmussen 1999b; Rasmussen & Thorning 1999. Further information Contact GEUS, Department of Economic Geology, at malm@geus.net.

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