Rochechouart meteorite crater - Identification of projectile

Details Rochechouart meteorite crater - Identification of projectile Rochechouart meteorite crater - Identification of projectile

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82..750j&link_type=abstract

Journal of Geophysical Research, vol. 82, Feb. 10, 1977, p. 750-758.

Physics

11

Abundance, Meteorite Craters, Meteoritic Composition, Neutron Activation Analysis, France, Iridium, Iron Meteorites, Nickel, Osmium, Palladium, Recrystallization, Stony Meteorites

Scientific paper

Ten samples from the 20-km Rochechouart crater in France have been analyzed for the siderophile elements Ir, Os, Re, Au, Pd, Ni, and Ge by radiochemical neutron activation analysis. The up to 1000-fold enrichment of siderophiles correlates with shock effects, increasing in the following order from least to greatest: basement rocks, glass-free breccias, glassy breccias, impact melts. The abundance pattern of the meteorite was determined from interelement correlations. Several samples fell off the correlation lines, presumably due to recrystallization and weathering of impact glasses during the approximately 165-m.y. age of the crater. The most reliable diagnostic elements were Os, Ir, Ni, and Pd; their abundance ratios suggest that the Rochechouart meteorite was a IIA iron.

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