Anhydrous Phase B: Transmission Electron Microscope Characterization and Elastic Properties.
Geochem Geophys Geosyst
; 20(8): 4059-4072, 2019 Aug.
Article
em En
| MEDLINE
| ID: mdl-31762710
We have performed an extensive characterization by transmission electron microscopy (including precession electron diffraction tomography and ab initio electron diffraction refinement as well as electron energy loss spectroscopy) of anhydrous phase B (AnhB) formed directly from olivine at 14 GPa, 1400 °C. We show that AnhB, which can be considered as a superstructure of olivine, exhibits strong topotactic relationships with it. This lowers the interfacial energy between the two phases and the energy barrier for nucleation of AnhB, which can form as a metastable phase. We have calculated the elastic and seismic properties of AnhB. From the elastic point of view, AnhB appears to be more isotropic than olivine. AnhB displays only a moderate seismic anisotropy quite similar to the one of wadsleyite.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2019
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Article