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Helium isotope variations in seafloor basalts from the Northwest Lau Backarc Basin: Mapping the influence of the Samoan hotspot

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dc.contributor.authorLupton, John
dc.contributor.authorArculus, Richard
dc.contributor.authorGreene, Ronald
dc.contributor.authorEvans, L. J.
dc.contributor.authorGoddard, C. I.
dc.date.accessioned2015-12-10T22:28:21Z
dc.date.issued2009
dc.date.updated2016-02-24T12:01:40Z
dc.description.abstractNew helium isotope results for seafloor basalts from the northern Lau Basin indicate that the signature of the Samoan hotpot has penetrated beneath the Rochambeau Rifts (RR) and the Northwest Lau Spreading Center (NWLSC) all the way to the Peggy Ridge (PR). Helium isotope ratios in 29 samples from the NWLSC - RR range from 10.9 to 28.1 Ra, all clearly higher than typical depleted mantle or MOR-type values. Comparison with other helium results from the northern Lau Basin show the Samoan hotspot influence is confined to the NWLSC - RR extensional zone, and is absent in the northeast Lau Basin and along the PR. The absence of high 3He/4He ratios in the northeast Lau Basin may delimit the eastward extent of the Pacific Plate tear which allowed southward intrusion of the Samoan plume, or indicate deep mantle flow carrying the Samoan plume signal westward from the Samoan Islands.
dc.identifier.issn0094-8276
dc.identifier.urihttp://hdl.handle.net/1885/54435
dc.publisherAmerican Geophysical Union
dc.sourceGeophysical Research Letters
dc.subjectKeywords: Back-arc basin; Helium isotopes; Hot spot; Mantle flow; Pacific plates; Sea floor; Basalt; Isotopes; Radioactivity; Helium; basalt; helium isotope; hot spot; isotopic ratio; mantle plume; plate boundary; seafloor; spreading center; American Samoa; Lau Bas
dc.titleHelium isotope variations in seafloor basalts from the Northwest Lau Backarc Basin: Mapping the influence of the Samoan hotspot
dc.typeJournal article
local.bibliographicCitation.lastpage5
local.bibliographicCitation.startpageL17313.1
local.contributor.affiliationLupton, John, NOAA Pacific Marine Environmental Laboratory
local.contributor.affiliationArculus, Richard, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGreene, Ronald, Oregon State University
local.contributor.affiliationEvans, L J, Oregon State University
local.contributor.affiliationGoddard, C I, Oregon State University
local.contributor.authoruidArculus, Richard, u9401389
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.ariespublicationu9503261xPUB300
local.identifier.citationvolume36
local.identifier.doi10.1029/2009GL039468
local.identifier.scopusID2-s2.0-71949089893
local.identifier.thomsonID000269756000004
local.type.statusPublished Version

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