Mineralogical study of the ALH-77283 iron meteorite

• Main Authors: Saito,Jun, Tagai,Tokuhei, Tachikawa,Osamu, Takeda,Hiroshi
• Format: Report
• Language: English
• Published: Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo/Mineralogical Institute, Faculty of Science, University of Tokyo 1987
• Subjects: Victoria Land; Yamato; Allan Hills; Antarc*; Antarctica; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2136; http://id.nii.ac.jp/1291/00002136/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2136&item_no=1&attribute_id=18&file_no=1

Of the many meteorites recovered so far from the Yamato Mountains and Victoria Land, Antarctica, only twenty-four have been irons. One of these, Allan Hills-77283,type IA coarse octahedrite, contains diamond-lonsdaleite nodules, for which extraterrestrial shock origin has been proposed. The shock textures of ALH-77283,52 have been studied by metallographic, X-ray and electron diffraction, and analytical SEM techniques. The shock pressure and temperature were estimated to be about 600-750 kb and 400-500℃ from the shock-hatched and recrystallized kamacites in comparison with the standard scale produced by the shock-loaded experiments on the Odessa iron meteorite (HEYMANN et al. : J. Geophys. Res., 71,619,1966; M. E. LIPSCHUTZ : Geochim. Cosmochim. Acta, 31,621,1967).