Abstract
Uranium mineralisations were discovered in acid voicanic rocks in Randbøldal, Gauss Halvø, during field work in 1974 folIowing an airborne radiometric survey (Nielsen & Steenfeit, 1975). The geology of the area has been described by Butler (1954), Graeter (1957) and Alexander-Marrack & Friend (1976).
Highlights
Uranium occurs in the lower volcanic member of the Kap Franklin series of Middle Devonian age
The uranium conlents ofthe mineraJised rhyolites are in the order af 500-1500 ppm; the thorium conlent averages 30 ppm
Fission track examination has shown that the distribution ofuraniurn within thecarburan is uniform in most cases. This differs from carburan described from the Witwatersrand, where the uraniurn is restricted to remnants of uraninite within the hydrocarbon (Schidlowski, 1966)
Summary
Uraniferous hydrocarbons (carburan) associated with Devonian acidvo1canic rocks, Randbøldal, northern Uranium mineralisations were discovered in acid voicanic rocks in Randbøldal, Gauss Halvø, during field work in 1974 folIowing an airborne radiometric survey (Nielsen & Steenfeit, 1975). Uranium occurs in the lower volcanic member of the Kap Franklin series of Middle Devonian age. The carburan has three principal modes of occurrence: (1) in joints, veinletsand along grain boundaries, (2) as isolated globular or amoeboidal grains with diameter in the range 1-5 mm, (3) disseminated or sometimes 'as clusters, with individual grain sizes usually less than l mm.
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