The role of inherited Pb in controlling the quality of speleothem U-Pb ages

Engel, John; Pickering, Robyn

doi:10.1016/j.quageo.2021.101243

Cited by 2 publications

(1 citation statement)

References 68 publications

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“…Concordia-intercept ages are well-suited to Pb-rich materials such as carbonates and apatite that typically contain variable Pb*/common-Pb ratios within individual growth horizons Engel and Pickering, 2022;Chew et al, 2011). To compute ages using this approach, multiple co-genetic samples uncorrected for common Pb are plotted on a Tera-Wasserburg diagram.…”

Section: Concordia-intercept Agesmentioning

confidence: 99%

DQPB: software for calculating disequilibrium U-Pb ages

Pollard

Woodhead²,

Hellström³

et al. 2022

Preprint

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Abstract. DQPB is software for calculating U-Pb ages while accounting for the effects of radioactive disequilibrium among intermediate nuclides of the U-series decay chains. The software is written in Python and distributed both as a pure Python package, and a stand-alone GUI application that integrates with standard Microsoft Excel spreadsheets. The software implements disequilibrium U-Pb equations to compute ages using various approaches, including concordia-intercept ages on a Tera-Wasserburg diagram, disequilibrium U-Pb isochron ages, Pb/U ages based on single analyses, and modified 207Pb ages. These age calculation approaches are tailored toward young materials that cannot reasonably be assumed to have attained radioactive equilibrium at the time of analysis, although they may also be applied to older materials where disequilibrium is no longer analytically resolvable. The software allows users to implement a variety of regression algorithms using both classical and robust statistics approaches, compute weighted average ages, and construct customisable, publication-ready plots of U-Pb age data. Age uncertainties are propagated using Monte Carlo methods.

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Section: Concordia-intercept Agesmentioning

confidence: 99%

DQPB: software for calculating disequilibrium U-Pb ages

Pollard

Woodhead²,

Hellström³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

DQPB: software for calculating disequilibrium U–Pb ages

Pollard¹,

Woodhead²,

Hellström³

et al. 2023

Geochronology

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Abstract. Initial radioactive disequilibrium amongst intermediate nuclides of the U decay chains can have a significant impact on the accuracy of U–Pb ages, especially in young samples. For samples that can reasonably be assumed to have attained radioactive equilibrium at the time of analysis, a relatively straightforward correction may be applied. However, in younger materials where this assumption is unreasonable, it is necessary to replace the familiar U–Pb age equations with more complete expressions that account for growth and decay of intermediate nuclides through time. DQPB is software for calculating U–Pb ages while accounting for the effects of radioactive disequilibrium among intermediate nuclides of the U decay chains. The software is written in Python and distributed as both a pure Python package and a stand-alone graphical user interface (GUI) application that integrates with standard Microsoft Excel spreadsheets. The software implements disequilibrium U–Pb equations to compute ages using various approaches, including concordia intercept ages on a Tera–Wasserburg diagram, U–Pb isochron ages, Pb*/U ages based on single aliquots, and 207Pb-corrected ages. While these age-calculation approaches are tailored toward young samples that cannot reasonably be assumed to have attained radioactive equilibrium at the time of analysis, they may also be applied to older materials where disequilibrium is no longer analytically resolvable. The software allows users to implement a variety of regression algorithms based on both classical and robust statistical approaches, compute weighted average ages and construct customisable, publication-ready plots of U–Pb age data. The regression and weighted average algorithms implemented in DQPB may also be applicable to other (i.e. non-U–Pb) geochronological datasets.

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The role of inherited Pb in controlling the quality of speleothem U-Pb ages

Cited by 2 publications

References 68 publications

DQPB: software for calculating disequilibrium U-Pb ages

DQPB: software for calculating disequilibrium U-Pb ages

DQPB: software for calculating disequilibrium U–Pb ages

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