TY - JOUR
T1 - XAFS study on Ca local structure in natural glasses and tektite
AU - Tobase, T.
AU - Wang, L.
AU - Yoshiasa, A.
AU - Okube, M.
AU - Nakatani, T.
AU - Hayasaka, Y.
AU - Isobe, H.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - 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.
AB - 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.
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U2 - 10.1088/1742-6596/430/1/012070
DO - 10.1088/1742-6596/430/1/012070
M3 - Conference article
AN - SCOPUS:84877314720
VL - 430
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012070
T2 - 15th International Conference on X-Ray Absorption Fine Structure, XAFS 2012
Y2 - 22 July 2012 through 28 July 2012
ER -