Mathematics – Logic
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...40..439k&link_type=abstract
Icarus, vol. 40, Dec. 1979, p. 439-445.
Mathematics
Logic
Asteroids, Astronomical Models, Carbonaceous Chondrites, Meteoritic Composition, Planetary Structure, Chondrule, Deposition, Petrology, Planetology, Regolith, Solar System
Scientific paper
A model for the accretion and hence the internal structure of carbonaceous chondrite-like asteroids is proposed. For initial solar system conditions of low temperature and low energy in the area of the present asteroid belt, assuming initially hydrated grains, a scenario for asteroid accretion in three temporal stages with characteristic lithologies is presented. In the first stage, low-velocity accretion of fine silicate and carbonaceous grains produces a chondrule-free pretologic type 1 lithology, in the second stage low-velocity fine silicate and carbonaceous accretion continues with the addition of a few larger higher-velocity bodies producing fluid drop and lithic chondrules, as in types 2 and 3 carbonaceous chondrites, and in the third stage high-velocity low-mass meteoroid impacts dominate, producing a sparse, thin, erosive lunar-like regolith. The model is compared with the textures of CI, CM, CO and CV carbonaceous chondrites, and future direct observations of asteroidal material are considered.
King Edward A.
King Trude V. V.
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