Preprints
https://doi.org/10.5194/gchron-2020-37
https://doi.org/10.5194/gchron-2020-37

  06 Jan 2021

06 Jan 2021

Review status: a revised version of this preprint was accepted for the journal GChron and is expected to appear here in due course.

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

Andrew J. Mason1, Anton Vaks1,a, Sebastian F. M. Breitenbach2, John N. Hooker1,b, and Gideon M. Henderson1 Andrew J. Mason et al.
  • 1Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK
  • 2Department of Geography and Environmental Sciences, Northumbria University, Ellison Place, Newcastle upon Tyne, NE1 8ST, UK
  • apresent address: Geological Survey of Israel, 32 Yeshayahu Leibowitz Street, 9692100 Jerusalem, Israel
  • bpresent address: Department of Geosciences, Penn State University, 503 Deike Building, University Park, PA 16802, USA

Abstract. We describe a new method for the measurement of U/Pb 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 Ma to 20 Ma old. The new method is capable of applying the 235U-207 and 238U-234U-206Pb chronometers, common Pb and quantifiable residual 234U/238U disequilibrium permitting. These provide an alternative to the more widely used 238U-206Pb chronometer, which can be highly inaccurate for samples a few million years old, owing to uncertainties in the excess initial 234U (hence, excess radiogenic 206Pb) commonly observed in speleothems.

Andrew J. Mason et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2020-37', Robert Cliff, 18 Mar 2021
    • AC1: 'Reply on RC1', Andrew Mason, 25 Mar 2021
  • RC2: 'Comment on gchron-2020-37', Ryan Ickert, 03 Jun 2021
    • AC2: 'Reply on RC2', Andrew Mason, 29 Jun 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gchron-2020-37', Robert Cliff, 18 Mar 2021
    • AC1: 'Reply on RC1', Andrew Mason, 25 Mar 2021
  • RC2: 'Comment on gchron-2020-37', Ryan Ickert, 03 Jun 2021
    • AC2: 'Reply on RC2', Andrew Mason, 29 Jun 2021

Andrew J. Mason et al.

Andrew J. Mason et al.

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Short summary
A novel technique for the uranium-lead dating of geologically young carbonates is described and tested. The technique expands our ability to date geological events such as fault movements and past climate records.