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Selective ingress of a Samoan plume component into the northern Lau backarc basin

Nebel, Oliver; Arculus, Richard J.

Description

Intra-plate basalt isotopic trends require mixing between enriched mantle components (EM1, EM2, HIMU) and a primordial component with high (3)He/(4)He termed FOZO. However, proportions of components, geometric distributions within individual plumes, relative proportions of melting components and loci of mixing of melts and residues remain poorly understood. Here we present new Hf-Nd isotopic data of dredged sea floor basalts from the northern Lau backarc basin, ~250 km south of the subaerial...[Show more]

dc.contributor.authorNebel, Oliver
dc.contributor.authorArculus, Richard J.
dc.date.accessioned2015-04-01T02:56:12Z
dc.date.available2015-04-01T02:56:12Z
dc.identifier.issn2041-1723
dc.identifier.urihttp://hdl.handle.net/1885/13140
dc.description.abstractIntra-plate basalt isotopic trends require mixing between enriched mantle components (EM1, EM2, HIMU) and a primordial component with high (3)He/(4)He termed FOZO. However, proportions of components, geometric distributions within individual plumes, relative proportions of melting components and loci of mixing of melts and residues remain poorly understood. Here we present new Hf-Nd isotopic data of dredged sea floor basalts from the northern Lau backarc basin, ~250 km south of the subaerial and submerged Samoan chain, with high (3)He/(4)He, (20)Ne/(22)Ne and primordial (129)Xe/(130)Xe, characteristic of the FOZO component. Combined Hf-Nd-noble gas isotope systematics require mixing of refractory, sub-northwestern Lau backarc mantle only with a spatially restricted FOZO component, most plausibly sourced from part of the Samoan plume. Other geographically restricted and possibly volumetrically minor enriched Samoan plume components are not detectable in northern Lau backarc samples, consistent with selective plume ingress of the FOZO component beneath the basin.
dc.description.sponsorshipThis study was funded by the Australian Research Council through a DECRA fellowship to O.N. (grant no. DE120100513) and a discovery grant to R.J.A. and O.N. (DP120104240).
dc.format7 pages
dc.publisherNature Publishing Group
dc.rights© 2015 Macmillan Publishers Limited.
dc.sourceNature Communications
dc.subjecthafnium
dc.subjectinert gas
dc.subjectisotope
dc.subjectneodymium
dc.subjectbasalt
dc.subjectcontrolled study
dc.subjectisotope analysis
dc.subjectplume
dc.subjectriver basin
dc.subjectSamoan Islands
dc.titleSelective ingress of a Samoan plume component into the northern Lau backarc basin
dc.typeJournal article
local.identifier.citationvolume6
dcterms.dateAccepted2015-02-09
dc.date.issued2015-03-12
local.identifier.absfor040200 - GEOCHEMISTRY
local.identifier.absfor040300 - GEOLOGY
local.identifier.ariespublicationa383154xPUB1237
local.publisher.urlhttp://www.nature.com/
local.type.statusPublished version
local.contributor.affiliationNebel, Oliver, CPMS Research School of Earth Sciences, The Australian National University
local.contributor.affiliationArculus, Richard J., CPMS Research School of Earth Sciences, The Australian National University
dc.relationhttp://purl.org/au-research/grants/arc/ DE120100513
dc.relationhttp://purl.org/au-research/grants/arc/ DP120104240
local.identifier.essn2041-1723
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage7
local.identifier.doi10.1038/ncomms7554
dc.date.updated2015-12-10T10:20:35Z
local.identifier.scopusID2-s2.0-84924587963
CollectionsANU Research Publications

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