Distribution of rare-earth elements in rocks from terrestrial astroblemes

Details Distribution of rare-earth elements in rocks from terrestrial astroblemes Distribution of rare-earth elements in rocks from terrestrial astroblemes

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990geokh......915v&link_type=abstract

Geokhimiia (ISSN 0016-7525), July 1990, p. 915-925. In Russian.

Astronomy and Astrophysics

Astronomy

Geochemistry, Planetary Craters, Rare Earth Elements, Chemical Composition, Minerals, Rocks

Scientific paper

Results are presented on REE distributions in samples obtained from several astroblemes, including rocks from the Ternovskii and Boltysh astroblemes in the Ukraine and irgizites of the Zhamanshin crater. It was found that acidic irgizites of the Zhamanshin crater are characterized by negative Eu anomaly, while basic irgizites have positive anomaly, pointing to different sources for these impactites. The vein-rock impactites of the Ternovsky crater are enriched in heavy REE relative to the target rocks; this is explained by a selective extraction by the impact melt. The impactites of the Boltysh crater are characterized by a unified REE spectrum relative to target rocks, as well as by a lower negative Eu anomaly.

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