The most primitive objects in the solar system

Details The most primitive objects in the solar system The most primitive objects in the solar system

Feb 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975sciam.232...30g&link_type=abstract

Scientific American, vol. 232, Feb. 1975, p. 30-38.

Computer Science

4

Carbonaceous Meteorites, Chondrites, Meteoritic Composition, Solar System, Condensates, Cosmology, Phase Diagrams, Planetary Evolution, Solid Phases, Vapor Phases

Scientific paper

Chondrites, the most primitive samples of the solar system known to man, contain minerals condensed directly out of the solar nebula. When the theoretical distribution of elements among crystalline phases and gaseous species at temperatures obtained at the time of solar system formation is calculated, it agrees well with the minerals identified in chondrites by chemical analysis, scanning electron microscopy, and X-ray diffraction. Calcium, aluminum, and titanium - elements with very high melting points - predominate chemically; well-formed crystals projecting into cavities are found, typical of condensation from a vapor; and crystal structure accords with that of the very compounds predicted to condense first. Neutron activation reveals enriched concentration of trace elements - proof of their condensation at high temperatures. Spatial relations (inclusion, etc.) of the minerals conform to the calculated condensation sequence. Magnetite is found in a spectacular circular-plate-stack shape unknown on earth; therefore it is likely that it condensed directly from the vapor rather than was formed through oxidization of preexisting iron minerals, whose shape it would have mimicked.

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