Helium isotopic systematics within the neovolcanic zones of Iceland

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Authors:Kurz, Mark D.; Meyer, Peter S.; Sigurdsson, Haraldur
Author Affiliations:Primary:
Woods Hole Oceanogr. Inst., Dep. Chem., Woods Hole, MA, United States
Other:
Univ. R.I., Grad. Sch. Oceanogr., United States
Volume Title:Earth and Planetary Science Letters
Source:Earth and Planetary Science Letters, 74(4), p.291-305. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X
Publication Date:1985
Note:In English. 66 refs.; illus. incl. 2 tables, sketch maps
Summary:Helium isotopic compositions were measured in a suite of sub-glacial basaltic glasses from the neovolcanic zones of Iceland. The 3He/4He ratios vary between 8 and 26.2X atmospheric; the higher ratios are generally consistent with a relatively primitive undegassed mantle source for He. Sampling tests indicate that sub-glacial basaltic glasses retain a representative sample of magmatic He, much like MORB. The overall variations, high observed He concentrations (= or <1.6 X 10-6cm3 STP/g), and the young age of Icelandic crust argue strongly against crustal contamination as a primary control of He isotopes in the basaltic lavas. Each volcanic zone has a distinctive basaltic 3He/4He signature; 18-26.2X atmospheric in the eastern zone and central Iceland, 12-16X atmospheric in the eastern zone, and 8-11 in the NE zone. The data are interpreted within the framework of a plume model for the mantle beneath Iceland. The preferred model involves variable contributions from a plume source (i.e. undegassed) to each of the Icelandic volcanic zones. He isotopic results (22) and 20 major-element analyses of glasses from the four zones are presented. [P.Br.]
Subjects:Geochemistry; Glasses; He-4/He-3; Helium; Igneous rocks; Isotopes; Noble gases; Rift zones; Stable isotopes; Volcanic rocks; Volcanism; Volcanology; Europe; Iceland; Western Europe; Neovolcanic zone
Abstract Numbers:86M/1965
Record ID:1986014007
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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