Japan Geoscience Union Meeting 2014

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Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG61_2AM2] Petrology, Mineralogy and Resource Geology

Fri. May 2, 2014 11:00 AM - 12:45 PM 311 (3F)

Convener:*Toshiaki Tsunogae(Faculty of Life and Environmental Sciences (Earth Evolution Sciences), University of Tsukuba), Koichiro Fujinaga(Department of Systems Innovation, School of Engineering, University of Tokyo), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Nobutaka Tsuchiya(Department of Geology, Faculty of Education, Iwate University), Chair:Koichiro Fujinaga(Department of Systems Innovation, School of Engineering, University of Tokyo), Akira Miyake(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University)

11:30 AM - 11:45 AM

[SCG61-10] Estimation of intracrystalline distribution coefficient of Mg-Fe ions in olivine using Cs-corrected STEM

*Akira MIYAKE1, Shoichi TOH2, Keiichi FUKUNAGA3, Takahiro KURIBAYASHI4 (1.Kyoto Univ., Sci., 2.Fukuoka Univ., Sci., 3.JFCC, 4.Tohoku Univ., Sci.)

Keywords:STEM, olivine, intracrystalline distribution coefficient

Intracrystalline distribution coefficient of Mg-Fe ions between the two types of the octahedral sites (M1, M2-site) of olivine, (Mg,Fe)2SiO4, have been estimated using X-ray or neutron diffraction studies. Recently, the high angle annular dark field (HAADF) method using scanning transmission electron microscopy with the correction of spherical aberration (Cs-corrected STEM) visualizes the element column sites in crystalline samples. In the present study, the intracrystalline distribution coefficient of Mg-Fe ions in olivine were tried to estimate using HAADF-STEM. And furthermore, Crystal Structure Analysis of same sample was carried out using e four-circle X-ray diffractometer. We used the synthetic forsterite and the natural olivine from San Carlos, Sri Lanka and Miyake-jima. HAADF-STEM images parallel to a-axis show the Mg / Fe atom columns and the columns which alternately formed of Si and O atoms. Intracrystalline distribution coefficients estimated from the brightness in M1/M2-sites for synthetic forsterite, the olivines from San Carlos and SriLanka are good agreement with those estimated from X-ray method. On the other hand, that obtained from Miyake-jima is different with that obtained from X-ray method.