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Vibrational spectra of olivine composition glasses: The Mg-Mn join |
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| Authors: | Quentin Williams Paul McMillan Thomas F Cooney |
| Institution: | 1. Department of Geology and Geophysics, University of California, 94720, Berkeley, CA, USA 3. Department of Chemistry, Arizona State University, 85287, Tempe, AZ, USA 4. Hawaii Institute of Geophysics, University of Hawaii at Manoa, 2525 Correa Rd., 96822, Honolulu, HI, USA |
| Abstract: | The vibrational frequencies of a series of splatquenched, olivine glasses spanning the compositional range from Mg2SiO4 to Mn2SiO4 have been determined using both infrared and Raman spectroscopies. The spectra of all glasses show evidence of tetrahedral coordination of silicon (possibly with some slight distortions), and largely octahedral coordination of magnesium. Spectra of Mn-rich glasses indicate that there is some manganese in 4 or 5-fold coordination. The frequencies observed for the fundamental vibrations of the silica tetrahedra are similar to those previously observed for SiO4 groups in both crystalline and glassy orthosilicates. Additionally, there is evidence for a small amount of silicate polymerization in all glasses characterized: vibrations attributable to Si2O7 groups are visible in both infrared and Raman spectra. |
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