Other
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..165b&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 165.
Other
3
Interplanetary Dust, Chondrule, Carbonaceous Materials, Atmospheric Entry, Carbon, Atmospheric Heating, Scanning Electron Microscopy, Carbonization, Graphite, Metal Particles
Scientific paper
IDPs were examined that were strongly heated during atmospheric entry as well as those that were artificially heated in the microprobe and SEM. Most of the samples were found to contain vesicular carbon, strongly supporting the hypothesis that the vesicles are the result of thermal processes. It is concluded that thermal carbonization of IDP polymeric material must involve mass loss and bulk carbon abundances measured for IDPs should be considered lower limits. Carbonaceous material undergoes plastic deformation during atmospheric entry and textural relationships between carbon and other IDP components are likely to be altered in the process. Graphite does exist in IDPs but appears to have been produced during entry heating and is only observed in particles heated to about 1000 C. Rapid melting of carbon-rich chondrule and cosmic spherule precursors and lead to formation of a carbonized component that contains small metal beads.
Bradley John P.
Brownlee Don E.
Joswiak Dave
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