Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/126919
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Type: Conference item
Title: Removal of Hg Interferences for Common Pb Correction When Dating Minerals by LA-ICP-MS/MS
Author: Gilbert, S.
Wade, B.
Glorie, S.M.
Bockmann, M.
Citation: Goldschmidt 2019 Abstracts, 2019, pp.1139-1139
Publisher: Royal Society of Chemistry
Issue Date: 2019
ISSN: 0267-9477
1364-5544
Conference Name: Goldschmidt 2019
Statement of
Responsibility: 
Sarah E. Gilbert and Stijn Glorie
Abstract: LA-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.
Rights: This journal is © The Royal Society of Chemistry 2020
DOI: 10.1039/D0JA00224K
Grant ID: http://purl.org/au-research/grants/arc/DP200101881
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