Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Longitude: -58.5, Latitude: 54.5

In the vicinity of Cape Aillik and Cape Makkovik on the Labrador coast and on offshore islands occur numerous gently dipping dykes (? cone sheets) possibly related to a centre beneath Aillik Bay. The dykes are generally less than 1.5 m thick and vary from ultramafic through carbonated varieties to dykes almost wholly composed of carbonate. The ultramafic dykes consist of phlogopite, augite and olivine in a fine grained carbonate-rich matrix. To some varieties the name aillikite has been given. Syenitic dykes of nepheline, albite, pyroxene and amphibole are also found.

K-Ar on biotite gave 570 Ma (Currie, 1976a, p. 115).
CURRIE, K.L. 1976a. The alkaline rocks of Canada. Bulletin, Geological Survey of Canada, 239: 1-228. KRANCK, E.H. 1953. Bedrock geology of the seaboard of Labrador between Domino Run and Hopedale, Newfoundland. Bulletin, Geological Survey of Canada, 26: 1-45.
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