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Primordial and recycled helium isotope signatures in the mantle transition zone

Timmerman, Suzette; Honda, Masahiko; Burnham, Antony; Amelin, Yuri; Woodland, S; Pearson, D. Graham; Jaques, Alan; Le Losq, Charles; Bennett, Victoria; Bulanova, G.P; Smith, C.B; Harris, J.W.; Tohver, E

Description

Isotope compositions of basalts provide information about the chemical reservoirs in Earth’s interior and play a critical role in defining models of Earth’s structure. However, the helium isotope signature of the mantle below depths of a few hundred kilometers has been difficult to measure directly. This information is a vital baseline for understanding helium isotopes in erupted basalts. We measured He-Sr-Pb isotope ratios in superdeep diamond fluid inclusions from the transition zone (depth...[Show more]

dc.contributor.authorTimmerman, Suzette
dc.contributor.authorHonda, Masahiko
dc.contributor.authorBurnham, Antony
dc.contributor.authorAmelin, Yuri
dc.contributor.authorWoodland, S
dc.contributor.authorPearson, D. Graham
dc.contributor.authorJaques, Alan
dc.contributor.authorLe Losq, Charles
dc.contributor.authorBennett, Victoria
dc.contributor.authorBulanova, G.P
dc.contributor.authorSmith, C.B
dc.contributor.authorHarris, J.W.
dc.contributor.authorTohver, E
dc.date.accessioned2020-01-13T03:57:03Z
dc.identifier.issn1095-9203
dc.identifier.urihttp://hdl.handle.net/1885/197049
dc.description.abstractIsotope compositions of basalts provide information about the chemical reservoirs in Earth’s interior and play a critical role in defining models of Earth’s structure. However, the helium isotope signature of the mantle below depths of a few hundred kilometers has been difficult to measure directly. This information is a vital baseline for understanding helium isotopes in erupted basalts. We measured He-Sr-Pb isotope ratios in superdeep diamond fluid inclusions from the transition zone (depth of 410 to 660 kilometers) unaffected by degassing and shallow crustal contamination. We found extreme He-C-Pb-Sr isotope variability, with high 3He/4He ratios related to higher helium concentrations. This indicates that a less degassed, high-3He/4He deep mantle source infiltrates the transition zone, where it interacts with recycled material, creating the diverse compositions recorded in ocean island basalts.
dc.description.sponsorshipThis research is supported by AGRTP and Ringwood scholarships and an IAGC Elsevier Ph.D. student research grant to S.T., ARC-DP140101976 to M.H. and A.L.J., and a CERC to D.G.P.
dc.description.sponsorshipThis research is supported by AGRTP and Ringwood scholarships and an IAGC Elsevier Ph.D. student research grant to S.T., ARC-DP140101976 to M.H. and A.L.J., and a CERC to D.G.P
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherAmerican Association for the Advancement of Science
dc.rights© The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science
dc.sourceScience
dc.titlePrimordial and recycled helium isotope signatures in the mantle transition zone
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume365
dc.date.issued2019
local.identifier.absfor040200 - GEOCHEMISTRY
local.identifier.ariespublicationu6048437xPUB771
local.publisher.urlhttps://www.aaas.org/
local.type.statusPublished Version
local.contributor.affiliationTimmerman, Suzette, College of Science, ANU
local.contributor.affiliationHonda, Masahiko, College of Science, ANU
local.contributor.affiliationBurnham, Antony, College of Science, ANU
local.contributor.affiliationAmelin, Yuri, College of Science, ANU
local.contributor.affiliationWoodland, S, University of Alberta
local.contributor.affiliationPearson, D. Graham, University of Alberta
local.contributor.affiliationJaques, Alan, College of Science, ANU
local.contributor.affiliationLe Losq, Charles, College of Science, ANU
local.contributor.affiliationBennett, Victoria, College of Science, ANU
local.contributor.affiliationBulanova, G.P, School of Earth Sciences, University of Bristol
local.contributor.affiliationSmith, C.B, School of Earth Sciences, University of Bristol
local.contributor.affiliationHarris , J.W., University of Glasgow
local.contributor.affiliationTohver, E, University of Sao Paolo
local.description.embargo2037-12-31
dc.relationhttp://purl.org/au-research/grants/arc/DP140101976
local.bibliographicCitation.issue6454
local.bibliographicCitation.startpage692
local.bibliographicCitation.lastpage694
local.identifier.doi10.1126/science.aax5293
dc.date.updated2019-08-25T08:20:33Z
CollectionsANU Research Publications

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