Removal of Hg interferences for common Pb correction when dating apatite and titanite by LA-ICP-MS/MS

Simple item page
dc.contributor.authorGilbert, S.
dc.contributor.authorGlorie, S.M.
dc.contributor.conferenceGoldschmidt 2019
dc.date.issued2020
dc.description.abstractLA-ICP-MS U–Pb dating is one of the most commonly used geochronology methods for dating minerals such as zircon, apatite, monazite and titanite. However, many of these U-bearing minerals also contain non-radiogenic common Pb, which requires correction to accurately determine the age of the mineral. Correction methods include: determining the ²⁰⁷Pb/²⁰⁶Pb common-Pb ratio; the iterative Andersen (2002) method using the measured ²⁰⁶Pb/²³⁸U, ²⁰⁷Pb/²³⁵U and ²⁰⁷Pb/²⁰⁶Pb; using ²⁰⁸Pb for low Th-bearing minerals; or using the non-radiogenic ²⁰⁴Pb. To date, the ²⁰⁴Pb correction method has been limited by the isobaric interference from ²⁰⁴Hg, which requires mathematical correction by measuring ²⁰²Hg. In this study we demonstrate that for LA-ICP-MS analysis, the Hg interference can efficiently be removed by a charge transfer reaction using NH₃ gas in the reaction cell of an Agilent 8900 ICP-MS/MS, without any additional interference correction required. We demonstrate the applicability of the ²⁰⁴Pb correction method using a range of common Pb bearing apatites and titanites. The use of LA-ICP-MS/MS enables accurate ²⁰⁴Pb correction at ²⁰⁴Pb sensitivity lower than could be corrected previously.
dc.description.statementofresponsibilitySarah E. Gilbert and Stijn Glorie
dc.identifier.citationJournal of Analytical Atomic Spectrometry, 2020; 35(7):1472-1481
dc.identifier.doi10.1039/D0JA00224K
dc.identifier.issn0267-9477
dc.identifier.issn1364-5544
dc.identifier.orcidGilbert, S. [0000-0003-3259-7983]
dc.identifier.orcidGlorie, S.M. [0000-0002-3107-9028]
dc.identifier.urihttp://hdl.handle.net/2440/126919
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.granthttp://purl.org/au-research/grants/arc/DP200101881
dc.rightsThis journal is © The Royal Society of Chemistry 2020
dc.source.urihttps://doi.org/10.1039/d0ja00224k
dc.titleRemoval of Hg interferences for common Pb correction when dating apatite and titanite by LA-ICP-MS/MS
dc.typeJournal article
pubs.publication-statusPublished

Files

Collections

Adelaide Microscopy publications
Geology & Geophysics publications