Calculation of 230ThU isochrons, ages, and errors
Geochimica et Cosmochimica Acta
By: K.R. Ludwig and D.M. Titterington
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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 that1. weights the points according to their analytical errors and error correlations, and
- 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 234U238U are given. Equations for estimating the necessary isotope-ratio errors and error-correlations for both alpha-spectrometric and mass-spectrometric data are also developed.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Calculation of 230ThU isochrons, ages, and errors |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(94)90229-1 |
| Volume | 58 |
| Issue | 22 |
| Year Published | 1994 |
| Language | English |
| Publisher | Elsevier |
| Description | 12 p. |
| First page | 5031 |
| Last page | 5042 |