Computer Science
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..30..234n&link_type=abstract
Earth and Planetary Science Letters, vol. 30, no. 2, May 1976, p. 234-240.
Computer Science
3
Chemical Composition, Craters, Interplanetary Dust, Lunar Rocks, Micrometeoroids, Cratering, Iron Meteorites, Spherules, Stony Meteorites, Stony-Iron Meteorites
Scientific paper
Residual meteoritic material has been detected on the surface of crater interiors on lunar samples. Iron-nickel micrometeoroid residues are present in the form of metallic spherules embedded in or attached to the crater glass-linings; stony-iron meteorite residual material is homogeneously mixed with the glass-linings. Crater simulation experiments show the dependence of crater diameter to depth ratio (D/T) on projectile density. However, projectile velocities exceeding 4 km/s have no measurable influence on the D/T ratios of microcraters. Measurements on lunar microcraters yield three groups of micrometeorites in the size range between 1 micrometer and 1 mm: iron-nickel, stony-iron and low-density particles. The D/T values correspond directly to the kind of determined projectile residues: craters showing residues of iron-nickel meteorites have ratios of D/T equals 1.3-1.4 and craters with stony-iron residues have ratios of D/T equals 1.9-2.1. Craters with diameters smaller than 30 micrometers seem to have been formed predominantly by iron-nickel micrometeorites, whereas craters with diameters greater than 80 micrometers predominantly by stony meteorites.
Fechtig Hugo
Gentner W.
Gerhard Neukum
Nagel Kai
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