Other
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..915f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, June 1981, p. 915-937, 939-943.
Other
39
Chondrites, Electron Microscopy, Interplanetary Dust, Meteoritic Composition, Micrometeorites, Chemical Composition, Chondrule, Earth Atmosphere, Electron Diffraction, Morphology, Polycrystals, Single Crystals, Stratosphere, Tables (Data), X Ray Analysis, Interplanetary Dust, Tem, Solar System, Electron Microscopy, Experiments, Composition, Morphology, Mineralogy, Particles, Metals, X-Ray Analysis, Silicate, Procedure, Observations, Chemistry, Matrix, Origin, Comets, Crystals, Analysis, Chondrites, Samples,
Scientific paper
An analytical electron microscope study of dispersed interplanetary dust aggregates collected in the earth's stratosphere shows that, in spite of their similarities, the aggregates exhibit significant differences in composition, internal morphology, and mineralogy. Of 11 chondritic particles examined, two consist mostly of a noncrystalline chondritic material with an atomic S/Fe ratio equal to or greater than 2 in places, one consists of submicron metal and reduced silicate 'microchondrules' and sulfide grains embedded in a carbonaceous matrix, and another consists of submicron magnetic-decorated unequilibrated silicate and sulfide grains with thick low-Z coatings. Although the particles are unmetamorphosed by criteria commonly applied for chondritic meteorites, the presence of reduced chemistries and the ubiquity of mafic, instead of hydrated, silicates confirm that they are not simply C1 or C2 chondrite matrix material. The observations indicate that portions of some particles have not been significantly altered by thermal or radiation processes since their assembly, and that the particles probably contain fine debris from diverse processes in the early solar system.
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