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Is this discovery of the century ?

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With the recent discovery of the giant, deeply eroded, 3 Ga
Maniitsoq impact structure in southern West Greenland
(Garde 2010), an enigmatic, c. 75 by 15 km large, curvilinear
belt of undeformed norite intrusions with Ni-Cu mineralisation
was re-interpreted as representing crustally contaminated
melts derived from the mantle in the wake of the impact
(Fig. 1; Garde et al. 2012). The norite belt (Nielsen 1976;
Secher 1983) was discovered in the early 1960s by the mining
and exploration company Kryolitselskabet Oresund A/S,
and more than one hundred shallow exploration holes were
drilled by the company in the period 1965–1971. The mineralisation
has subsequently been investigated by Cominco
Ltd., Falconbridge Ltd. and NunaMinerals A/S. In 2011, the
re-interpretation of the norite belt, and recent availability of
improved airborne geophysical exploration tools, prompted
the Canadian company North American Nickel Inc. (NAN)
to resume exploration.

Authors:
Adam A. Garde, John Pattison, Thomas F. Kokfelt, Iain McDonald and Karsten Secher

© 2013 GEUS. Geological Survey of Denmark and Greenland Bulletin 28, 45–48. Open access: www.geus.dk/publications/bull

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