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

L A Kirstein, M J Timmerman

Research output: Contribution to journalArticlepeer-review

Abstract

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 He-3/He-4 ratios of 11-16R(a), potentially up to 23R(a) (R-a=atmospheric ratio of 1.39 x 10(-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.

Original languageEnglish
Pages (from-to)923-927
Number of pages5
JournalJournal of the Geological Society
Volume157
Issue number5
DOIs
Publication statusPublished - Sep 2000

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