Articles | Volume 4, issue 2
Geochronology, 4, 561–576, 2022
https://doi.org/10.5194/gchron-4-561-2022
Geochronology, 4, 561–576, 2022
https://doi.org/10.5194/gchron-4-561-2022
Research article
19 Aug 2022
Research article | 19 Aug 2022

An algorithm for U–Pb geochronology by secondary ion mass spectrometry

Pieter Vermeesch

Model code and software

simplex (1.0) Pieter Vermeesch https://doi.org/10.5281/zenodo.6954203

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Short summary
Secondary ion mass spectrometry (SIMS) is the oldest and most sensitive analytical technique for in situ U–Pb geochronology. This paper introduces a new algorithm for SIMS data reduction that treats data as compositional data, which means that the relative abundances of 204Pb, 206Pb, 207Pb, and 238Pb are processed within a tetrahedral data space or simplex. The new method is implemented in an eponymous computer programme that is compatible with the two dominant types of SIMS instruments.