Other
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984geokh......781b&link_type=abstract
Geokhimiia (ISSN 0016-7525), June 1984, p. 781-790. In Russian.
Other
Geochemistry, Impact Melts, Iridium, Meteorite Craters, Meteoritic Composition, Planetary Craters, Neutron Activation Analysis, Rocks, U.S.S.R.
Scientific paper
A neutron activation technique was used to determine the iridium content in rocks from terrestrial impact craters in Ianisiarvi, Karelia, and Elgygytgyn, Chukhotka, USSR. The data are combined with iridium distribution values obtained from rocks in 16 other craters, and analyzed together. The analysis shows that impact cratering does not introduce significant amounts of meteorite matter into the impact crushing process (into breccias with no impact melt). Impact melts from nine craters were divided into two groups according to their iridium content. The first group was characterized by high iridium content (1 to 1000 ppb) due to contamination in the meteorite matter. The second group was characterized by low iridium content (less than 0.1 ppb). The low iridium content in the second group could be due either to low content in the projectiles or to iridium removal, possibly in the gaseous phase.
Bazilevskii Aleksandr T.
Feldman V. I.
Kapustkina I. G.
Kolesov Gennadii M.
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