Helium isotopic systematics within the neovolcanic zones of Iceland

Saved in:
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
Tags: Add Tag
No Tags, Be the first to tag this record!
LEADER 03350naaaa2200493zu 4500
001 1986014007
003 ViAlAGI
005 20190221164956.0
008 190110e198508 ne a 0 0 eng d
040 |a ViAlAGI  |c ViAlAGI 
072 7 |a 02D  |2 georeft 
100 1 |a Kurz, Mark D.  |e analytic author  |u Woods Hole Oceanogr. Inst., Dep. Chem., Woods Hole, MA 
245 1 0 |a Helium isotopic systematics within the neovolcanic zones of Iceland 
300 |a p. 291-305 
500 |a In English. 66 refs. 
500 |a Abstract number: 86M/1965 
500 |a Abstractor: P.Br. 
500 |a Affiliation: Woods Hole Oceanogr. Inst., Dep. Chem.; Woods Hole, MA; USA; United States 
500 |a Affiliation: Univ. R.I., Grad. Sch. Oceanogr.; ; USA; United States 
500 |a Key title: Earth and Planetary Science Letters 
500 |a Source note: Earth and Planetary Science Letters, 74(4), p.291-305. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X 
500 |a Publication type: journal article 
504 |b 66 refs. 
510 3 |a GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom 
520 |a Helium isotopic compositions were measured in a suite of sub-glacial basaltic glasses from the neovolcanic zones of Iceland. The >3`He/>4`He 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 #LT1.6 X 10>-6`cm>3` 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 >3`He/>4`He 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. 
650 7 |a Geochemistry  |2 georeft 
650 7 |a Glasses  |2 georeft 
650 7 |a He-4/He-3  |2 georeft 
650 7 |a Helium  |2 georeft 
650 7 |a Igneous rocks  |2 georeft 
650 7 |a Isotopes  |2 georeft 
650 7 |a Noble gases  |2 georeft 
650 7 |a Rift zones  |2 georeft 
650 7 |a Stable isotopes  |2 georeft 
650 7 |a Volcanic rocks  |2 georeft 
650 7 |a Volcanism  |2 georeft 
650 7 |a Volcanology  |2 georeft 
651 7 |a Europe  |2 georeft 
651 7 |a Iceland  |2 georeft 
651 7 |a Western Europe  |2 georeft 
653 |a Neovolcanic zone 
700 1 |a Meyer, Peter S.,  |e analytic author 
700 1 |a Sigurdsson, Haraldur,  |e analytic author 
773 0 |t Earth and Planetary Science Letters  |d Amsterdam : Elsevier, Aug. 1985  |x 0012-821X  |y EPSLA2  |n Earth and Planetary Science Letters, 74(4), p.291-305. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X Publication type: journal article  |g Vol. 74, no. 4  |h illus. incl. 2 tables, sketch maps