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Helium isotopes in early tertiary basalts, northeast Greenland: evidence for 58 Ma plume activity in the north Atlantic-Iceland volcanic province

Marty, B., Upton, B.G.J., and Ellam, R.M. (1998) Helium isotopes in early tertiary basalts, northeast Greenland: evidence for 58 Ma plume activity in the north Atlantic-Iceland volcanic province. Geology, 26 (5). pp. 407-410. ISSN 0091-7613 (doi:10.1130/0091-7613(1998)026<0407:HIIETB>2.3.CO;2)

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Publisher's URL: http://dx.doi.org/10.1130/0091-7613(1998)026<0407:HIIETB>2.3.CO;2

Abstract

3He/4He ratios in olivine phenocrysts have been measured in 58 Ma basaltic lavas from the Hold with Hope region of northeast Greenland. These lavas constitute a part of the North Atlantic volcanic province. The samples exhibit a wide range of 3He/4He ratios between 1.7Ra and 21Ra (Ra =the atmospheric 3He/4He ratio =1.386 x 10-6), which is comparable to the previously recorded range for Quaternary Icelandic basalts. These He isotope variations may partly result from crustal assimilation, but 3He/4He ratios higher than those of mid-ocean-ridge basalts support early participation of plume-head material at the onset of volcanic activity in the North Atlantic volcanic province. As with the Deccan-Reunion plume and the Ethiopia-Afar plume, this long-term contribution of 3He-rich material is fully consistent with models that ascribe a deep (i.e., deeper than the convective mantle that drives plate tectonics) origin for plume-source material, but contradicts those that postulate a shallow-mantle origin for continental flood basalts and large igneous provinces.

Item Type:Article
Status:Published
Refereed:Yes
Glasgow Author(s):Ellam, Prof Robert
Authors: Marty, B., Upton, B.G.J., and Ellam, R.M.
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Geology
ISSN:0091-7613
ISSN (Online):1943-2682

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