C-rich micrometeorites on the early Earth and icy planetary bodies

Details C-rich micrometeorites on the early Earth and icy planetary bodies C-rich micrometeorites on the early Earth and icy planetary bodies

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990esasp.315..167m&link_type=abstract

In ESA, Formation of Stars and Planets, and the Evolution of the Solar System p 167-172 (SEE N91-18922 10-90)

Computer Science

1

Chemical Analysis, Crystal Structure, Ice Floes, Micrometeorites, Primitive Earth Atmosphere, Earth (Planet), Icy Satellites, Organic Compounds, Planetary Craters, Star Formation, Stellar Evolution

Scientific paper

The analysis of about 200 mg of 50 to 100 microgram size dust particles extracted from 100 tons of Antarctic blue ice is reported. This dust constitutes the purest and the best preserved source of giant Unmelted Chondritic Micrometeorites (UMCs) recovered from terrestrial sediments. Both the bulk composition of UMCs and their crystal chemistry indicate that at least 95 percent of them are relative to primitive unequilibrated meteorites. They are mostly composed of porous aggregates of submicronsize grains, that contain substituted aromatic organic compounds. UMCs might have functioned as minicenters of prebiotic synthesis on the early Earth.

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