Mathematics – Logic
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989metic..24...99s&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 24, June 1989, p. 99-112.
Mathematics
Logic
113
Interplanetary Dust, Meteoritic Composition, Micrometeorites, Stratosphere, Aluminum, Calcium, Carbon, Electron Microscopy, Iron, Magnesium, Oxygen, Silicones, Sulfur, Interplanetary Dust, Micrometeorites, Major Elements, Stratosphere, Idps, Samples, Extraterrestrial, X-Ray Methods, Edx, Laboratory Studies, Iron, Composition, Particles, Morphology, Depletion, Origin, Source, Asteroids, Comets, Procedure, Photomicrographs, Magnesium, Aluminum, Sulfur, Carbon, Calcium, Oxygen, Mineralogy, Comparisons, Formati
Scientific paper
Results are presented on an element-composition study conducted on 200 interplanetary dust particles (IDPs) collected with NASA's U2 and RB 47 aircraft at altitudes near 20 km. These IDPs could be classified into two major morphological types, i.e., the 'porous' and the 'smooth' particle types, which showed significant compositional differences. Namely, elemental abundances found in porous particles are closely matching those of the CI chondrites, while the smooth particle group displayed systematic Ca and Mg depletions and contained stoichiometric 'excess' oxygen, consistent with the presence of hydrous phases. This fact, together with the occurrence of carbonates, magnetite framboids, and layer silicates, provides evidence that at least a significant number of the smooth-type IDPs were processed by aqueous activity. It is hypothesized that extensive aqueous activity only occurs in asteroids (as opposed to comets) and that the smooth class of IDPs is of an asteroidal origin.
Brownlee Don E.
Schramm S. L.
Wheelock Maya M.
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