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Journal of the Geological Society; 2000; v. 157; issue.5; p. 923-928
© 2000 Geological Society of London

Regular Article

Evidence of the proto-Iceland plume in northwestern Ireland at 42 Ma from helium isotopes

LINDA A. KIRSTEIN & MARTIN J. TIMMERMAN

1 Faculteit Der Aardwetenschappen, Vrije Universiteit, 1085 de Boelelaan, Amsterdam, The Netherlands (e-mail: kirl{at}geo.vu.nl)
2 School of Earth Sciences, Leeds University, Leeds LS2 9JT, UK

Scientific editing by Nick Rogers.

Combined K–Ar and Ar–Ar dating of a xenolith-bearing alkaline dyke, previously considered to be of late Palaeozoic age, suggest a mid-Eocene age of c. 43 Ma, indicating that it is part of extensive rift-related Tertiary intrusive activity. High 3He/4He ratios of 11–16Ra, potentially up to 23Ra (Ra=atmospheric ratio of 1.39x10–6) have been measured from mantle xenoliths in the dyke and are consistent with previous determinations of the helium isotope composition of Tertiary lavas in Greenland and Scotland linking the magmatism with the proto-Iceland mantle plume.


Keywords: NW Ireland, Tertiary, Iceland plume, helium, argon dating.




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