Alkaline Rocks and Carbonatites of the World

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Kap Washington Volcanics

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Occurrence number: 
063-00-001
Country: 
Greenland
Location: 
Longitude: -39, Latitude: 83

The Kap Washington volcanics group outcrops on the north coast of Johannes V. Jensen Land and Lockwood O, and is in thrust contact with Palaeozoic metasediments of the North Greenland fold belt. The volcanics include basaltic, trachytic and rhyolitic lavas together with pyroclastic flows, breccias and tuffs, with minor intercalated sediments containing fossil plant material. Riebeckite occurs in both trachytes and rhyolites but a detailed petrological account is not yet available.

Age: 
Rb-Sr data on five whole rock specimens indicated an age of 63 Ma (Larsen et al., 1978, p. 116).
References: 
BROWN, P.E. and PARSONS, I. 1981. The Kap Washington volcanics. Rapport, Gronlands Geologiske Undersogelse, 106: 65-8. LARSEN, O., DAWES, P.R. and SOPER, N.J. 1978. Rb/Sr age of the Kap Washington Group, Peary Land, North Greenland, and its geotectonic implication. Rapport, Gronlands Geologiske Undersogelse, 90: 115-9
Fig. 84 Distribution of the Kap Washington volcanic group (after Brown and Parsons, 1981, Fig. 21)
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith