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Calculation of 230Th U isochrons, ages, and errors

Geochimica et Cosmochimica Acta

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Abstract

If analytical errors are responsible for the scatter of points on a 230Th-234U-238U isochron diagram, the isochron should be fitted by a technique that 1. (1) weights the points according to their analytical errors and error correlations, and 2. (2) either takes into account the presence of some of the same data in two coupled XY isochrons or (equivalently) uses a single, three-dimensional XYZ isochron. A method based on maximum-likelihood estimation is presented that fulfills these requirements, and the relevant equations for errors in age and initial 234U 238U are given. Equations for estimating the necessary isotope-ratio errors and error-correlations for both alpha-spectrometric and mass-spectrometric data are also developed. ?? 1994.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Calculation of 230Th U isochrons, ages, and errors
Series title:
Geochimica et Cosmochimica Acta
Volume
58
Issue:
22
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
5031
Last page:
5042
Number of Pages:
12