Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..323m&link_type=abstract
Journal of Geophysical Research, Vol. 89, Suppl., p. C323 - C328
Physics
8
Iron Meteorites:Parent Bodies
Scientific paper
High-velocity (≡2 to ≡5 km/sec) impacts into octahedrite iron meteorites (Gibeon, El Sampal, and Arispe), steel, and iron targets were made at the NASA-Ames Vertical Gun Facility. The experiments clearly revealed the brittle behavior of meteorites at very low temperatures (<200K) as indicated by spallation of the crater rim and the development of deeply penetrating fractures in the meteorite sample. High-velocity (≡5 km/sec) impacts resulted in a net mass loss regardless of the brittle-ductile behavior of the target or projectile, whereas low-velocity (≡2 km/sec) impacts resulted in a net mass gain for ductile projectiles into brittle and ductile targets. Consequently, even if iron meteorites (octahedrites) were originally the core of a layered parent body, they might be subsequently destroyed in a brittle manner. Such results are consistent with the hypothesis by Matsui and Mizutani (1977) that the brittle behavior or iron-like planetesimals in the low-temperature asteroid zone prevents growth into full-size planets.
Matsui Takafumi
Schultz Peter H.
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