Analytical electron microscopy of Mg-SiO smokes; a comparison with infrared and XRD studies
Rietmeijer, Frans J.M., Nuth, Joseph A., & Mackinnon, Ian D.R. (1986) Analytical electron microscopy of Mg-SiO smokes; a comparison with infrared and XRD studies. Icarus, 66(2), pp. 211-222.
Experimentally obtained Mg.SiO smokes were studied by analytical electron microscopy using the same samples that had been previously characterized by repeated infrared spectroscopy. Analytical electron microscopy shows that unannealed smokes contain some degree of microcrystallinity which increases with increased annealing for up to 30 hr. An SiO2 polymorph (tridymite) and MgO may form contemporaneously as a result of growth of forsterite (Mg2SiO4) microcrystallites in the initially nonstoichiometric smokes. After 4 hr annealing, forsterite and tridymite react to enstatite (MgSiO3). We suggest that infrared spectroscopy and X-ray diffraction analysis should be complemented by detailed analytical electron microscopy to detect budding crystallinity in vapor phase condensates.
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|Item Type:||Journal Article|
|Additional Information:||GeoRef, Copyright 2009, American Geological Institute.
|Keywords:||accretion, chain silicates, condensation, cosmic dust, electron microscopy data, enstatite, forsterite, framework silicates, infrared spectra, nesosilicates, olivine group, orthopyroxene, orthosilicates, planetology, pyroxene group, silica minerals, silicates, solar nebula, tridymite|
|Subjects:||Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Extraterrestrial Geology (040302)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Mineralogy and Crystallography (040306)
|Divisions:||Current > Institutes > Institute for Future Environments|
|Deposited On:||21 Jan 2013 00:58|
|Last Modified:||21 Jan 2013 00:58|
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