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

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doi: 10.1144/GSL.JGS.1995.152.01.14
Authors:Chalmers, J. A.; Larsen, L. M.; Pedersen, A. K.
Author Affiliations:Primary:
Geological Survey of Greenland, Copenhagen, Denmark
Other:
British Geological Survey, United Kingdom
Geological Museum, Denmark
Volume Title:Iceland plume and its influence on the evolution of the NE Atlantic
Volume Authors:White, R. S., editor; Morton, A. C.
Source:Journal of the Geological Society of London, Vol.152 (Part 6), p.965-969; Second Arthur Holmes European research meeting, Reykjavik, Iceland, July, 1994, edited by R. S. White and A. C. Morton. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1995
Note:In English. 36 refs.; sketch maps
Summary:Voluminous volcanism took place W of Greenland and NW of the British Isles in the Palaeocene, 6-7 m.y. before the start of sea-floor spreading in the N 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 T ∼ 1500°C over a diameter of ∼ 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. [R.A.H.]
Subjects:Cenozoic; Igneous rocks; Mantle plumes; Paleocene; Paleogene; Picrite; Plate tectonics; Tertiary; Ultramafic composition; Volcanism; Atlantic Ocean; Labrador Sea; North Atlantic
Abstract Numbers:96M/2215
Record ID:1996076252
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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