1. bookVolume 30 (2008): Issue -1 (April 2008)
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eISSN
1897-1695
ISSN
1733-8387
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04 Jul 2007
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1 time per year
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English
access type Open Access

Selection of Suitable Data Sets Improves 230Th/U Dates of Dirty Material

Published Online: 28 Mar 2008
Volume & Issue: Volume 30 (2008) - Issue -1 (April 2008)
Page range: 69 - 77
Journal Details
License
Format
Journal
eISSN
1897-1695
ISSN
1733-8387
First Published
04 Jul 2007
Publication timeframe
1 time per year
Languages
English
Selection of Suitable Data Sets Improves <sup>230</sup>Th/U Dates of Dirty Material

230Th/U dating of dirty material such as fen peat and secondary carbonates depends on the ability to select suitable and to discard unsuitable data sets before the calculation of 230Th/U ages. This means that open system conditions with respect to uranium during ageing are excluded and solely one source of detrital contamination was present in the samples. Three kinds of selection approaches of suitable data sets were applied: (1) isotope ratio plots, (2) the isotope-ratio evolution plot and the iterative determination of the decay-corrected initial detrital 230Th/232Th activity ratio (AR) as well as (3) depth profiles of the uranium concentration and the 234U/238U AR and the ash content. For reliable 230Th/U age dating of dirty material all selection procedures have to be commonly applied because none of them works perfectly.

Keywords

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