Mathematics – Logic
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1069r&link_type=abstract
Lunar and Planetary Science, volume 27, page 1069
Mathematics
Logic
1
Alteration: Aqueous, Condensation, Microscopy: Analytical Electron, Protophyllosilicates, Solar Nebula
Scientific paper
Many studies have simulated vapor phase condensation in astrophysical environments such as the solar nebula. They generally investigated simple (Mg,Fe)-SiO vapors that yielded fine-grained amorphous and/or crystalline smokes with pyroxene and olivine compositions. A typical study matched infrared [IR] spectra of these smokes with those of astrophysical dusts but AEM analyses of smokes at the level of their constituents were rarely attempted. These analyses of the condensation event, including autometamorphism, and thermal alteration and hydration are necessary to constrain the onset of mineralogical activity in the solar nebula, in particular the nature of protophyllosilicates. Infrared spectroscopy, X-ray diffraction, scanning electron microscopy and AEM are the most common techniques for smoke characterization. The fact that IR spectroscopy is sensitive to different properties than AEM, for example, is not always appreciated, e.g. AEM analyses of hydrated Mg-SiO smokes with distinct IR features for layer silicates showed small amounts of protophyllosilicates restricted to domains with the appropriate MgO/SiO2 ratio. I report the ongoing effort of AEM characterization of experimentally hydrated Mg-SiO smokes with a resolution that allows comparisons with AEM studies of interplanetary dust particles [IDPs] and undifferentiated meteorite matrices.
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