Alkaline Rocks and Carbonatites of the World

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Kap Dalton

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Occurrence number: 
063-00-011
Country: 
Greenland
Location: 
Longitude: -24.02, Latitude: 69.03

Lying above the Tertiary basalts near Kap Dalton is a small area of Eocene-Oligocene fossiliferous sediments, principally sandstones, at the base of which is a conglomerate, less than 2 m thick containing rounded pebbles. Samples collected by Wager (1935, p. 19) were between 5 and 12 cm in diameter and proved to be alkaline igneous rocks including malignite, of about one third nepheline, rather less orthoclase and abundant analcime; tinguaite, with altered (?)nosean as well as nepheline and aegirine phenocrysts; monchiquite; leucite nephelinite with abundant microphenocrysts of pyroxene, nepheline, leucite and some perovskite and nepheline leucitite in which altered leucite occupies about 75% of the groundmass. Wager considered that the pebbles were derived from source regions further north.

References: 
SOPER, N.J. and COSTA. L.I. 1976. Palynological evidence for the age of Tertiary basalts and post-basaltic sediments at Kap Dalton, central East Greenland. Rapport, Gronlands Geologiske Undersogelse, 80: 123-7. WAGER, L.R. 1935. Geological investigations in East Greenland. Part II: Geology of Kap Dalton. Meddelelser om Gronland, 105(3): 1-32
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