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.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2013 1 1|
|イベント||15th International Conference on X-Ray Absorption Fine Structure, XAFS 2012 - Beijing, China|
継続期間: 2012 7 22 → 2012 7 28
ASJC Scopus subject areas
- Physics and Astronomy(all)