Computer Science
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981e%26psl..53..266m&link_type=abstract
Earth and Planetary Science Letters, vol. 53, no. 2, Apr. 1981, p. 266-274. Research supported by the Ministry of Education, Sc
Computer Science
17
Earth Crust, Geology, Meteoritic Microstructures, Pyroxenes, Rocks, Electron Microscopy, Lamella (Metallurgy), Photomicrography, X Ray Diffraction
Scientific paper
Transmission electron microscopy was used to find microtextures suggestive of the origin of orthopyroxenes of bronzite composition from three diogenites: Johnstown, Ibbenburen and Allan Hills ALPHA 77256. Sub-boundaries decorated with thick augite lamellae up to 100 microns in length were found in all three orthopyroxenes, and suggests either dislocation recovery processes during mild deformation or annealing at high subsolidus temperature. It is conjectured that during or after crystallization at high temperatures deep in the crust, diogenitic pyroxenes may have experienced mild deformation conditions at substantial static pressures and temperatures. Alternatively, several meteoritic impacts may have caused the destruction of a part of the diogenitic layer, with a large impact finally excavating the parental mass seen in the Johnstown specimen.
Mori Hatsumi
Takeda Hidenori
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