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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

Bernard Marty, Brian G. J. Upton and Rob M. Ellam
Helium isotopes in early Tertiary basalts, Northeast Greenland; evidence for 58 Ma plume activity in the North Atlantic-Iceland volcanic province
Geology (Boulder) (May 1998) 26 (5): 407-410

Abstract

(super 3) He/ (super 4) He 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 (super 3) He/ (super 4) He ratios between 1.7R (sub a) and 21R (sub a) (R (sub a) = the atmospheric (super 3) He/ (super 4) He ratio = 1.386X10 (super -6) ), which is comparable to the previously recorded range for Quaternary Icelandic basalts. These He isotope variations may partly result from crustal assimilation, but (super 3) He/ (super 4) He 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 (super 3) He-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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 26
Serial Issue: 5
Title: Helium isotopes in early Tertiary basalts, Northeast Greenland; evidence for 58 Ma plume activity in the North Atlantic-Iceland volcanic province
Affiliation: Centre National de la Recherche Scientifique, Centre de Recherches Petrographiques et Geochimiques, Vandoeuvre, France
Pages: 407-410
Published: 199805
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 26
Accession Number: 1998-033575
Categories: Isotope geochemistryIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Cent. Rech. Petrogr. et Geochim., Contrib. No. 1314; with GSA Data Repository Item 9849
Illustration Description: illus. incl. 2 tables, geol. sketch map
N00°00'00" - N75°00'00", W80°00'00" - E20°00'00"
Secondary Affiliation: Grant Institute of Geology, Edinburgh, GBR, United KingdomScottish Universities Research and Reactor Centre, East Kilbride, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199813
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