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Journal of the Geological Society; 1995; v. 152; issue.6; p. 965-969;
DOI: 10.1144/GSL.JGS.1995.152.01.14
© 1995 Geological Society of London

Papers

Widespread Palaeocene volcanism around the northern North Atlantic and Labrador Sea: evidence for a large, hot, early plume head

J. A. Chalmers1, L. M. Larsen1 & A. K. Pedersen2

1 Geological Survey of Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
2 Geological Museum, Øster Voldgade 5-7, DK-1350 Copenhagen K, Denmark

Voluminous volcanism took place west of Greenland and northwest of the British Isles in the Palaeocene, 6–7 Ma before the start of sea-floor spreading in the northern North Atlantic. Very hot (picritic) magmas were produced simultaneously in such widely separated areas that they could not all have been above the central stem of the same mantle plume. A single, large plume head with temperatures of c. 1500°C over a diameter of c. 2000 km can explain the observations if surface volcanic activity took place only where the lithosphere was thin. The presence of picrites does not indicate proximity to the plume stem.


Keywords: North Atlantic, Tertiary, volcanism, plumes, picrites.




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