Sodium diffusion in alkali feldspars
- Autor(en)
- Bengü Tas, Alexander Gorfer, Elena Petrishcheva, Gerhard Wilde, Rainer Abart, Sergiy Divinski
- Abstrakt
Tracer diffusion of Na in natural alkali feldspars including sanidine, adularia and orthoclase with different Na:K ratios, minor element contents and different degrees of Al/Si ordering is investigated using the radiotracer technique employing (Formula presented.) Na as the radioisotope. In adularia, the tracer diffusion measurements along the crystallographic directions ⊥(001) and ⊥(010) revealed a slight (within a factor of two to three) anisotropy of Na diffusion, with the faster diffusion rates along the ⊥(001) direction. The full diffusivity tensor for Na diffusion in one orthoclase is determined and a strong, temperature-dependent anisotropy of diffusion in the (010) plane is found. The state of Al/Si ordering is inferred to have a significant influence on the Na diffusion rates in alkali feldspar, while the presence of spurious alkaline impurities and major element composition plays a less important role.
- Organisation(en)
- Department für Lithosphärenforschung, Isotopenphysik
- Externe Organisation(en)
- Universität Münster
- Journal
- Philosophical Magazine
- Band
- 105
- Seiten
- 1606-1621
- Anzahl der Seiten
- 16
- ISSN
- 1478-6435
- DOI
- https://doi.org/10.1080/14786435.2025.2531527
- Publikationsdatum
- 2025
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105120 Petrologie
- Schlagwörter
- ASJC Scopus Sachgebiete
- Condensed Matter Physics
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/0c87f8b2-aad8-44e2-a063-75337ff602c5