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Dalconi, C.
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Dalconi, C.
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- PublicationRestrictedMagnesium K-edge EXAFS study of bond-length behaviour in synthetic pyrope-grossular garnet solid solution(2008-02)
; ; ; ; ; ; ;Quartieri, S. ;Boscherini, F. ;Dalconi, C. ;Iezzi, G.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Meneghini, C. ;Oberti, R. ; ; ;; ;Direct structural characterization of the changes in the local environment of Mg occurring in the garnet structure as a function of the Ca content are determined by Mg K-edge X-ray absorption fine structure on synthetic samples along the pyrope-grossular join. With increasing Ca content, the short Mg-O2 distance of the dodecahedron slightly decreases, while the long Mg-O4 distance tends to increase, so that the dodecahedron is more distorted in grossular-rich garnets than in end-member pyrope. This quantitative direct description of the changes in the local environment of Mg in the pyrope-grossular solid solution confirms and better defines previous experimental and recent computational results.158 30