Computer Science
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..28..217g&link_type=abstract
Earth and Planetary Science Letters, vol. 28, no. 2, Dec. 1975, p. 217-224.
Computer Science
Chemical Composition, Lunar Rocks, Metal Particles, Widmanstatten Structure, Fines, Iron Meteorites, Liquid Metals, Microstructure, Phase Transformations, Silicates, Spectrum Analysis
Scientific paper
The grape cluster metal particle 63344,1 found in lunar coarse fines is examined using the scanning electron microscope (SEM), electron microprobe, and an optical microscope. This metal particle is approximately 0.5 cm in its largest dimension and consists of hundreds of metallic globules welded together to form a structure somewhat like a bunch of grapes. Electron microprobe analysis for Fe, Ni, Co, P, and S in the metal was carried out using wavelength dispersive detectors. No primary solidification structure is observed in the globules, and the particle is slow cooled from the solidification temperature (nearly 1300 C) taking days to probably months to reach 600 C. Two mechanisms for the formation of globules are proposed. One mechanism involves the primary impact of an iron meteorite which produces a metallic liquid and vapor phase. The second mechanism involves the formation of a liquid pool of metal after impact of an iron meteorite projectile followed by a secondary impact in the liquid metal pool.
Agrell Stuart O.
Axon H. J.
Goldstein Joseph I.
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