Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..149b&link_type=abstract
Lunar and Planetary Science, volume 27, page 149
Other
6
Gems, Grains: Interstellar, Irradiation
Scientific paper
The anhydrous chondritic (CP) class of interplanetary dust particles (IDPs) are considered to be pristine (unprocessed) objects because of their fragile, porous microstructures and lack of evidence of significant parent body alteration. During their recent 10^4-10^5 year lifetimes in solar orbit, IDPs accumulate high densities of implanted solar flare tracks as well as solar wind irradiated amorphous rims along their outer surfaces. Some grains in anhydrous IDPs were also exposed to an earlier irradiation episode(s). These grains are of major significance because their exposure predates accretion of IDPs and, in the case of cometary IDPs, the exposure predates comet accretion. Since comets are primitive small bodies, it is conceivable that the grains are surviving solar nebula or presolar interstellar grains. The most well-characterized grains are GEMS (glass with embedded metal and sulfides). Several researchers have noted that properties of GEMS strongly resemble those of "amorphous silicates" which are ubiquitous throughout the interstellar medium. This is the more significant because the half dozen or so known properties of interstellar silicates, as determined from astronomical observations, are "exotic" and mutually exclusive of one another. If GEMS are indeed interstellar "amorphous silicates", then one of the main raw ingredients of the Solar System has been found.
Baragiola Raul
Bradley John P.
Brownlee Don E.
Dukes C.
Johnson Robert E.
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