Abstract
The local structures of tektite and natural glasses were studied by Ca K-edge X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) in order to provide quantitative data on bonding distances and coordination numbers. The pre-edge peak intensities of tektites are 10.7-11.7%, and those of peudotachylite, Kirauea volcanic glass, impactite, pitchstone and perlite are 6.7-10.9%. The main peak shoulder intensities of tektites are 68.3-70.7%, and other natural glasses are 63.0-63.9%. XAFS analysis indicated all tektites possess 7-coordinated Ca, but natural glasses possess 6-, 7- and 8- coordinated Ca. This study indicated that different petrogenesis of natural glasses gives different local structures of calcium.
| Original language | English |
|---|---|
| Article number | 012070 |
| Journal | Journal of Physics: Conference Series |
| Volume | 430 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2013 |
| Externally published | Yes |
| Event | 15th International Conference on X-Ray Absorption Fine Structure, XAFS 2012 - Beijing, China Duration: 2012 Jul 22 → 2012 Jul 28 |
ASJC Scopus subject areas
- Physics and Astronomy(all)