Carbon abundance and silicate mineralogy of anhydrous interplanetary dust particles

Details Carbon abundance and silicate mineralogy of anhydrous interplanetary dust particles Carbon abundance and silicate mineralogy of anhydrous interplanetary dust particles

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.1551t&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 7, p. 1551-1566.

Computer Science

54

Abundance, Carbonaceous Chondrites, Interplanetary Dust, Particle Size Distribution, Silicates, Solar System Evolution, Electron Microscopy, Light Elements, Mineralogy, Interplanetary Dust, Idps, Carbon, Abundance, Silicate, Mineralogy, Edx, Composition, Anhydrous Material, Samples, Extraterrestrial, Silicon, Electron Microscopy, Comparisons, Origin, Source, Comets, Asteroids, Procedure, Contamination, Elements, Distribution, X-Ray Methods

Scientific paper

We have studied nineteen anhydrous chondritic interplanetary dust particles (IDPs) using analytical electron microscopy. We have determined a method for quantitative light element EDX analysis of small particles and have applied these techniques to a group of IDPs. Our results show that some IDPs have significantly higher bulk carbon abundances than do carbonaceous chondrites. We have also identified a relationship between carbon abundance and silicate mineralogy in our set of anhydrous IDPs. In general, these particles are dominated by pyroxene, olivine, or a subequal mixture of olivine and pyroxene. The pyroxene-dominated IDPs have a higher carbon abundance than those dominated by olivines. Members of the mixed mineralogy IDPs can be grouped with either the pyroxene- or olivine-dominated particles based on their carbon abundance. The high carbon, pyroxene-dominated particles have primitive mineralogies and bulk compositions which show strong similarities to cometary dust particles. We believe that the lower carbon, olivine-dominated IDPs are probably derived from asteroids. Based on carbon abundances, the mixed-mineralogy group represents particles derived from either comets or asteroids. We believe that the high carbon, pyroxene-rich anhydrous IDPs are the best candidates for cometary dust.

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