Other
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.263..302a&link_type=abstract
Nature, vol. 263, Sept. 23, 1976, p. 302, 303.
Other
1
Iron Meteorites, Meteoritic Microstructures, Shear Properties, Thermodynamic Properties, Kamacite, Metallography, Meteoritic Composition, Surface Cracks, Surface Properties
Scientific paper
The results of a metallographic examination of a 250-g slice of the Jamestown iron meteorite are discussed. Surface heat alteration overlies all other aspects of metallic macro- and microstructure, which must therefore be of preterrestrial origin and not produced by impact with the earth's surface. Absence of recrystallization in the bulk of the kamacite suggests a reheating temperature below 450 C. Outstanding feature of the etched macrostructure of the specimen is the interruption of the regularity of the Widmanstaetten pattern by traces of at least five shear-displacement surfaces. More heavily deformed material within and immediately adjacent to the surfaces of shear displacement has recrystallized. It is proposed that the meteorite impacted and formed a crater on some unknown planetesimal, was heated and then released from its host, and then entered the earth's atmosphere.
Axon H. J.
Bevan Alex W. R.
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