Abstract
A detailed ground magnetic survey was carried out by the authors and Egon Hansen, electronics technician, during the spring of 1981 in the central part of the Sarfart6q carbonatite complex near Søndre Strømfjord. It was important for the survey that there was continuity of measurements over the whole area, and as most of the area was covered by swamp in the bottom of the valley Arnangarnqup kua, it was most convenient to make the survey when the surface was frozen.
Highlights
The Sarfart6q carbonatite complex and two occurences of hydrothermal mineralisation in South Greenland are distinguished by high F concentrations in the stream water, relative to waters with the same conductivity
Addition of acid causes an increase in the measured U concentrations
It can be related to a narrow (1-3 m) steeply outward-dipping sheet of nearly pure magnetite rock which is embedded in mainly rauhaugitic carbonatite representing the inner care
Summary
This study complements the geological ground survey of the carbonatite complex carried out from 1976 to 1979 when the complex was found, mapped and examined for economic minerals (Secher, 1976, 1979, 1980a, 1980b; Secher & Larsen, 1978, 1980). An airborne magnetic survey covering major areas in West Greenland, including the complex, had been carried out simultaneously by Thorning (1976, 1977). It can be related to a narrow (1-3 m) steeply outward-dipping sheet (marker horizon) of nearly pure magnetite rock which is embedded in mainly rauhaugitic carbonatite representing the inner care. This marker harizan is expased in the northern part of the core at two major localities, the easternmost of which is divided into three separate lenses of magnetite rock in a sequence about 20 m wide. The inner core outline should be revealed by the effect of the magnetite sheet, where it is present
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