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http://hdl.handle.net/2122/4841
Authors: | Quartieri, S.* Boscherini, F.* Dalconi, C.* Iezzi, G.* Meneghini, C.* Oberti, R.* |
Title: | Magnesium K-edge EXAFS study of bond-length behaviour in synthetic pyrope-grossular garnet solid solution | Journal: | American Mineralogist | Series/Report no.: | /93(2008) | Publisher: | Mineralogical Society of America | Issue Date: | Feb-2008 | DOI: | 10.2138/am.2008.2831 | Keywords: | Pyrope-grossular garnets EXAFS magnesium local environment |
Subject Classification: | 04. Solid Earth::04.01. Earth Interior::04.01.04. Mineral physics and properties of rocks | Abstract: | 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. |
Appears in Collections: | Article published / in press |
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