The inverse problem of argon diffusion from minerals: Determination of kinetic parameters from stepwise-heating experiments
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Abstract
Results of two routine 40Ar/39Ar stepwise heating experiments on a biotite and a basanite are interpreted in terms of Fick's and Arrhenius' laws. Both patterns represent a saddle-shaped 39Ar release. Argon isotope spectra are suggested to be controlled by the activation energy of diffusion E and the frequency factor Do . The activation energy of 39Ar is lower than the one of 40Ar. This results in a preferable release of 40Ar relatively to 39Ar at high-temperature steps and an increasing high-temperature wing in the saddle-shaped age spectrum. At low temperatures, considerable losses and irregularities in release of mainly 39Ar are observed, which cause the decreasing low-temperature wing in the “saddle”. The suggestion of argon losses (mainly of 39Ar) from a loose, “unstable” zone of the mineral structures becomes justified. The n-irradiation of the samples and the shift of E of 39Ar towards lower values seems to explain the saddle-shaped age-spectra often encountered in 40Ar/39Ar-geochronometry.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | The inverse problem of argon diffusion from minerals: Determination of kinetic parameters from stepwise-heating experiments |
| Series title | Isotopes in Environmental and Health Studies |
| DOI | 10.1080/10256019708234052 |
| Volume | 33 |
| Issue | 4 |
| Year Published | 1997 |
| Language | English |
| Publisher | Taylor & Francis |
| Description | 11 p. |
| First page | 399 |
| Last page | 409 |
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