Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



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

Author affiliations

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.

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

Back to tab navigation

Supplementary files

Article information


Submitted
12 May 2020
Accepted
16 Jun 2020
First published
17 Jun 2020

J. Anal. At. Spectrom., 2020, Advance Article
Article type
Paper

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

S. E. Gilbert and S. Glorie, J. Anal. At. Spectrom., 2020, Advance Article , DOI: 10.1039/D0JA00224K

Social activity

Search articles by author

Spotlight

Advertisements