MAGNESIUM SITE EXCHANGE IN FORSTERITE - A DIRECT MEASUREMENT BY HIGH-TEMPERATURE MG-25 NMR-SPECTROSCOPY

Authors
STEBBINS JF
Citation
Jf. Stebbins, MAGNESIUM SITE EXCHANGE IN FORSTERITE - A DIRECT MEASUREMENT BY HIGH-TEMPERATURE MG-25 NMR-SPECTROSCOPY, The American mineralogist, 81(11-12), 1996, pp. 1315-1320
Citations number
15
Categorie Soggetti
Geochemitry & Geophysics",Mineralogy
Journal title
The American mineralogist → ACNP
ISSN journal
0003004X
Volume
81
Issue
11-12
Year of publication
1996
Pages
1315 - 1320
Database
ISI
SICI code
0003-004X(1996)81:11-12<1315:MSEIF->2.0.ZU;2-Q
Abstract
High-resolution Mg-25 NMR data are reported for a single crystal of pu re forsterite (Mg2SiO4) at temperatures to about 1400 degrees C, which allow rates of exchange of Mg cations among specific sites in the str ucture to be obtained. Results are consistent with estimates of hoppin g frequencies derived from macroscopic diffusivity data, suggesting th at this approach holds potential for tracing microscopic diffusion pat hways in even very refractory minerals.