| Titre | An improved micro-capsule for zircon sissolution in uranium-lead geochronology |
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| Auteur | Parrish, R R |
| Source | New Developments and Applications in Isotope Geoscience; Chemical Geology (Isotope Geoscience Section) vol. 66, 1987 p. 99-102, https://doi.org/10.1016/0168-9622(87)90032-7 |
| Année | 1987 |
| Séries alt. | Commission géologique du Canada, Contributions aux publications extérieures 44186 |
| Éditeur | Elsevier BV |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1016/0168-9622(87)90032-7 |
| Media | papier; en ligne; numérique |
| Formats | pdf |
| Sujets | méthodes analytiques; datation au uranium-plomb; datation radiométrique; géochronologie; minéraux radioactifs |
| Diffusé | 1987 11 01 |
| Résumé | (disponible en anglais seulement)
A new design of Teflon® micro-capsule for mineral dissolution is described which offers advantages over the conventional Krogh vessel for use in zircon U-Pb
geochronology. The TFE Teflon® capsules have friction-fit caps and are intended to reside inside a larger Teflon® pressure vessel. The capsules have a capacity of ~ 0.35 ml, and are easy to machine, handle and clean. Because the capsules are not in
themselves pressure vessels, they do not deform, even at 250°C. Without this pressure differential, they have less tendency to trap undissolved crystals, Pb or U in the walls due to pressure enhanced diffusion or migration. Their capacity to be used
at 240-250°C allows for rapid dissolution of any zircon sample in = 30 hr. A number of tests have failed to detect either vapor phase transfer of Pb or U, or radiogenic Pb memory from one sample to the next at the picogram level. |
| GEOSCAN ID | 122266 |
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