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American Mineralogist; February-March; v. 93; no. 2-3; p. 495-498; DOI: 10.2138/am.2008.2831
© 2008 Mineralogical Society of America
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Letter

Magnesium K-edge EXAFS study of bond-length behavior in synthetic pyrope-grossular garnet solid solutions

Simona Quartieri1,*, Federico Boscherini2, Chiara Dalconi3, Gianluca Iezzi4,5, Carlo Meneghini6 and Roberta Oberti7

1 Dipartimento di Scienze della Terra, Università di Messina, Italy
2 Dipartimento di Fisica and CNISM, Università di Bologna, Italy
3 Dipartimento di Scienze della Terra, Università di Ferrara, Italy
4 Dipartimento di Scienze della Terra, Università G. d’Annunzio, Chieti, Italy
5 Department of Seismology and Tectonophysics, Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy
6 Dipartimento di Fisica "E. Amaldi" and CNISM, Università di Roma Tre, Italy
7 Istituto di Geoscienze e Georisorse, unità di Pavia, CNR, Italy

Correspondence: * E-mail: simona.quartieri{at}unimore.it

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.

Key Words: Pyrope-grossular garnets • EXAFS • magnesium • local environment






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