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Comparison of the raman microprobe spectra of (Mg,Fe)2SiO4 and Mg2GeO4 with olivine and spinel structures |
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| Authors: | F Guyot H Boyer M Madon B Velde J P Poirier |
| Institution: | 1. Institut de Physique du Globe de Paris, Université Paris 6, 4 place Jussieu, 75230, Paris Cedex 05, France 2. Instruments S.A. Jobin-Yvon, 16 rue du Canal, 91163, Longjumeau Cedex, France 3. Laboratoire de Géologie, E.N.S., 46 rue d'Ulm, 75230, Paris Cedex 05, France |
| Abstract: | Raman microprobe (RMP) spectra were produced for each of the olivine and spinel structured phases of Mg2GeO4 and (Mg, Fe)2SiO4. The assembled data show that bands due to the tetrahedra in silicate and germanate olivines shift in a way that indicates a dominant mass effect. This correspondence is difficult to make in spinels due to differences in structural type. Differences in Fe/Mg content of olivine shift the tetrahedral vibration bands only slightly, but their linear shifts could be used to indicate the composition of the phase. |
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