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Asuk, Qeqertarsuaq Island (Disko Island), Qaasuitsup, Greenland

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Latitude & Longitude (WGS84): 70° 10' 14'' North , 53° 14' 4'' West
Latitude & Longitude (decimal): 70.1708333333, -53.2347222222

At the northern coast of Qeqertarsuaq Island (Disko Island). Tertiary basalt with plagioclase-spinel-graphite bearing xenoliths occurs here. At this locality Steensrup, in 1872, first discovered and reported small lumps and grains of native iron in basalt. Earlier large boulders of native iron, thought to be meteoric in origin, has been found at Niakornak and Uvifaq.

Unique Ti oxides (likely related to Magnéli phases) were found in black, very fine-grained carbonaceous mudstone xenoliths among the reduced andesite breccia. The size of the xenoliths reaches 12 x l0 x 6 cm. They contain up to 2.3 vol% organic fragments (macerals), mainly vitrinite and inertinite.

Mineral List

14 valid minerals.

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Melson, William G. and George Switzer (1966): Plagioclase-spinel-graphite xenoliths in metallic iron-bearing basalts, Disko Island, Greenland. American Mineralogist. 51: 664-676

Pauly, H. (1969): White cast iron with cohenite, schreibersite, and sulphides from tertiary basalts on Disko, Greenland. Meddelelser fra Dansk Geologisk Forening, 19 (1), 28-26

Pedersen, A.K., Rønsbo, J.G. (1987): Oxygen deficient Tioxides (natural Magnéli phases) from mudstone xenoliths with native iron from Disko, central West Greenland. Contrib. Mineral. Petrol.: 96: 35-46; in: Jambor, J.L., Burke, E.A.J. (1990): New mineral Names. American Mineralogist: 75: 1434

Pedersen, A.K. (1979): A shale buchite xenolith with Al-armalcolite and native iron in a lava from Asuk, Disko, central West Greenland. Contributions to Mineralogy and Petrology. 69 (1), 83-94

Mineral and/or Locality  
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