Production of ²¹Ne in depth-profiled olivine from a 54 Ma basalt sequence, Eastern Highlands (37° S), Australia

dc.contributor.authorMatchan, Erin L.
dc.contributor.authorHonda, Masahiko
dc.contributor.authorBarrows, Timothy T.
dc.contributor.authorPhillips, David
dc.contributor.authorChivas, Allan R.
dc.contributor.authorFifield, L. Keith
dc.contributor.authorFabel, Derek
dc.date.accessioned2018-01-08T01:43:30Z
dc.date.issued2018
dc.description.abstractIn this study we investigate the cosmogenic neon component in olivine samples from a vertical profile in order to quantify muogenic 21Ne production in this mineral. Samples were collected from an 11 m thick Eocene basalt profile in the Eastern Highlands of southeastern Australia. An eruption age of 54.15 ± 0.36 Ma (2σ) was determined from ⁴⁰Ar/³⁹Ar step-heating experiments (n = 6) on three whole-rock samples. A ³⁶Cl profile on the section indicated an apparent steady state erosion rate of 4.7 ± 0.5 m Ma⁻¹. The eruption age was used to calculate in situ produced radiogenic ⁴He and nucleogenic ³He and ²¹Ne concentrations in olivine. Olivine mineral separates (n = 4), extracted from the upper two metres of the studied profile, reveal cosmogenic ²¹Ne concentrations that attenuate exponentially with depth. However, olivine (Fo₆₈) extracted from below 2 m does not contain discernible ²¹Ne aside from magmatic and nucleogenic components, with the exception of one sample that apparently contained equal proportions of nucleogenic and muogenic neon. Modelling results suggest a muogenic neon sea-level high-latitude production rate of 0.02 ± 0.04 to 0.9 ± 1.3 atoms g⁻¹ a⁻¹(1σ), or <2.5% of spallogenic cosmogenic ²¹Ne production at Earth’s surface. These data support a key implicit assumption in the literature that accumulation of muogenic ²¹Ne in olivine in surface samples is likely to be negligible/minimal compared to spallogenic 21Ne.en_AU
dc.description.sponsorshipThis work was supported by ARC Discovery grants DP0773815, DP0986235 and DP130100517. Constructive comments made by three anonymous reviewers were helpful in improving the quality of the manuscript.en_AU
dc.format.mimetypeapplication/pdfen_AU
dc.identifier.issn0016-7037en_AU
dc.identifier.urihttp://hdl.handle.net/1885/139090
dc.publisherElsevieren_AU
dc.relationhttp://purl.org/au-research/grants/arc/DP0773815en_AU
dc.relationhttp://purl.org/au-research/grants/arc/DP0986235en_AU
dc.relationhttp://purl.org/au-research/grants/arc/DP130100517en_AU
dc.rights© 2017 Elsevier B.V. http://www.sherpa.ac.uk/romeo/issn/0016-7037/..."Author's post-print on open access repository after an embargo period of between 12 months and 48 months" from SHERPA/RoMEO site (as at 8/01/18).en_AU
dc.sourceGeochimica et Cosmochimica Actaen_AU
dc.titleProduction of ²¹Ne in depth-profiled olivine from a 54 Ma basalt sequence, Eastern Highlands (37° S), Australiaen_AU
dc.typeJournal articleen_AU
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.lastpage290en_AU
local.bibliographicCitation.startpage276en_AU
local.contributor.affiliationFifield, L. K., Department of Nuclear Physics, Research School of Physics and Engineering, The Australian National Universityen_AU
local.contributor.authoremailu8100341@anu.edu.auen_AU
local.contributor.authoruidu8100341en_AU
local.identifier.ariespublicationu4351680xPUB335
local.identifier.citationvolume220en_AU
local.identifier.doi10.1016/j.gca.2017.09.035en_AU
local.identifier.uidSubmittedByu1005913en_AU
local.publisher.urlhttps://www.elsevier.com/en_AU
local.type.statusAccepted Versionen_AU

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