A simplified isotope dilution approach for the U–Pb dating of speleogenic and other low-232Th carbonates by multi-collector ICP-MS

Andrew J. Mason*, Anton Vaks, Sebastian F. M. Breitenbach, John N. Hooker, Gideon M. Henderson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We describe a new method for the measurement of ratios by isotope dilution multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) for the dating of geologically young clean carbonates, particularly speleothems. The method is intended for materials containing little or no initial 232Th. We illustrate and validate the method with four examples ranging from 0.57 to 20 Ma. The new method is capable of applying the 235U–207Pb and 238U–234U–206Pb chronometers, common Pb and quantifiable residual disequilibrium permitting. These provide an alternative to the more widely used 238U–206Pb chronometer, which can be highly inaccurate for samples that are < ca. 20 million years old, owing to uncertainties in the excess initial 234U (hence, excess radiogenic 206Pb) commonly observed in speleothems.
Original languageEnglish
Pages (from-to)33-54
Number of pages22
JournalGeochronology
Volume4
Issue number1
DOIs
Publication statusPublished - 17 Jan 2022

Fingerprint

Dive into the research topics of 'A simplified isotope dilution approach for the U–Pb dating of speleogenic and other low-232Th carbonates by multi-collector ICP-MS'. Together they form a unique fingerprint.

Cite this