Thermal history of the shock-melted Antarctic LL-chondrites from the Yamato-79 collection

Details Thermal history of the shock-melted Antarctic LL-chondrites from the Yamato-79 collection Thermal history of the shock-melted Antarctic LL-chondrites from the Yamato-79 collection

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3509o&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 54, Dec. 1990, p. 3509-3523.

Computer Science

5

Chondrites, Meteoritic Composition, Meteoritic Microstructures, Shock Heating, Shock Waves, Antarctic Regions, Melting, Rare Gases, Strontium Isotopes

Scientific paper

Major chemical composition, REE abundance, rare gas composition, and Rb-Sr systematics were determined for a series of shock-melted Yamato-79 LL-chondrites to investigate the late thermal history of these chondrites and the chemical features of the shock processes. Results indicate similar shock ages (about 1.2 Ga) for all of these chondrites as well as similar cosmic-ray exposures (about 28 Ma), petrographic textures, and sampling sites in Antarctica, indicating that all these meteorites are part of the same fall. Model calculations of Fe diffusion in olivine suggest that hot and cold materials were in close contact in the impact ejecta sheets of the parent body.

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