In situ Re–Os geochronology of Re-rich Palaeogene molybdenite by LA-ICP-MS/MS

Simple item page
dc.contributor.authorGlorie, S.
dc.contributor.authorThompson, J.
dc.contributor.authorGilbert, S.
dc.contributor.authorSouders, A.K.
dc.date.issued2025
dc.description.abstractIn situ Re–Os geochronology by LA-ICP-MS/MS was previously demonstrated by reacting Os with CH₄ or N₂O reaction gasses. However, for both reactions, a minor proportion of the Re parent isotope also reacts, potentially leading to significant isobaric interferences of ¹⁸⁷Re on ¹⁸⁷Os, especially for young samples with little radiogenic in-growth. Here we present an interlaboratory comparison and compare three reaction gas mixtures (CH₄ + H₂ + He, N₂O and N2O + He) with the aim to robustly date Palaeogene (66–23 Ma) molybdenite from the Bingham Canyon and Henderson deposits. CH₄ mixed with H₂ gas gives the highest sensitivity, while N₂O and He gas buffer Re reaction. On balance, the analytical method involving N₂O + He reaction gas is most suitable for dating Palaeogene molybdenite, resulting in age precision of 2.6% for Bingham and 5.8% for Henderson. For older, >1 Ga molybdenite, CH₄ + H₂ + He may give comparatively better age precision.
dc.description.statementofresponsibilityStijn Glorie, Jay M. Thompson, Sarah E. Gilbert and A. Kate Souders
dc.identifier.citationJournal of Analytical Atomic Spectrometry, 2025; 40(5):1394-1402
dc.identifier.doi10.1039/d5ja00030k
dc.identifier.issn0267-9477
dc.identifier.issn1364-5544
dc.identifier.orcidGlorie, S. [0000-0002-3107-9028]
dc.identifier.orcidGilbert, S. [0000-0003-3259-7983]
dc.identifier.urihttps://hdl.handle.net/2440/144867
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.granthttp://purl.org/au-research/grants/arc/FT210100906
dc.rightsThis journal is © The Royal Society of Chemistry 2025
dc.source.urihttps://doi.org/10.1039/d5ja00030k
dc.titleIn situ Re–Os geochronology of Re-rich Palaeogene molybdenite by LA-ICP-MS/MS
dc.title.alternativeIn situ Re–Os geochronology of Re-rich Palaeogene molybdenite by LA-ICP-MS/MS†
dc.typeJournal article
pubs.publication-statusPublished

Files

Collections

Research Outputs