| Title: |
Interlaboratory reproducibility of ID-TIMS U–Pb geochronology evaluated with a pre-spiked natural zircon solution |
| Authors: |
D. Szymanowski; J.-F. Wotzlaw; M. Ovtcharova; B. Schoene; U. Schaltegger; M. D. Schmitz; R. B. Ickert; C. Chelle-Michou; K. R. Chamberlain; J. L. Crowley; J. H. F. L. Davies; M. P. Eddy; S. P. Gaynor; A. Käßner; M. T. Mohr; A. N. Paul; J. Ramezani; S. Tapster; M. Tichomirowa; A. von Quadt; C. J. Wall |
| Source: |
Geochronology, Vol 7, Pp 409-425 (2025) |
| Publisher Information: |
Copernicus Publications |
| Publication Year: |
2025 |
| Collection: |
Directory of Open Access Journals: DOAJ Articles |
| Subject Terms: |
Geology; QE1-996.5; Stratigraphy; QE640-699 |
| Description: |
The highest precision and accuracy in U–Pb geochronology is achieved using isotope dilution thermal ionisation mass spectrometry (ID-TIMS), a technique which owes its reliability to precise Pb and U isotope ratio analysis, a largely unified framework of lab protocols, and common isotopic tracers with accurately determined compositions. However, while hardware and protocol developments have steadily improved the analytical precision, the level to which ID-TIMS U–Pb dates from different laboratories agree remains largely unquantified. To better assess both internal repeatability and interlaboratory reproducibility of this method, we have conducted an experiment in which a large batch of natural zircon was dissolved, mixed with a newly prepared 205 Pb– 233 U– 235 U tracer, and distributed as solution to participating laboratories. Thus prepared, pre-spiked, homogeneous PLES535 solution underwent the full sample preparation and analysis process separately in each lab, allowing a maximally unbiased comparison of the entire analytical procedure on a sample of unknown age. The results from 14 instruments at 11 institutions demonstrate internal repeatability of individual labs at 5 to 10 U–Pb analyses, with mean squared weighted deviation (MSWD) values generally indicative of single age populations. Lab weighted-mean 206 Pb / 238 U and 207 Pb / ... |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://gchron.copernicus.org/articles/7/409/2025/gchron-7-409-2025.pdf; https://doaj.org/toc/2628-3697; https://doaj.org/toc/2628-3719; https://doaj.org/article/87f374d9a1374fa1b7f4916b38284883 |
| DOI: |
10.5194/gchron-7-409-2025 |
| Availability: |
https://doi.org/10.5194/gchron-7-409-2025; https://doaj.org/article/87f374d9a1374fa1b7f4916b38284883 |
| Accession Number: |
edsbas.B592CBA4 |
| Database: |
BASE |