R2: Crystal structure, crystal chemistry, physical properties of minerals, crystal growth and applied mineralogy

[R2-06] Variation of iron species in plagioclase crystals by X-ray absorption fine structure analysis

*Nakada Ryoichi¹, Masahiko Sato², Masashi Ushioda³, Yujiro Tamura⁴, Shinji Yamamoto⁴ (1. JAMSTEC, 2. Univ. of Tokyo, 3. AIST, 4. Yokohama National Univ.)

Keywords:XAFS, Plagioclase, magnetic anomaly

Valence state of Fe in plagioclase varies among crystals separated from the same plutonic rock. Two different sites are confirmed as a host of Fe in plagioclase from the same rock. L_III-edge XANES is more suitable for speciation analysis because K-edge XANES underestimate the contribution of tetrahedral Fe.