Computer Science
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981metic..16..171b&link_type=abstract
Meteoritics, vol. 16, June 30, 1981, p. 171-184.
Computer Science
17
Meteorite Craters, Meteoritic Composition, Mineralogy, Tektites, Abundance, Neutron Activation Analysis, Quartzite, Rare Earth Elements, U.S.S.R., Meteorites, Zhamanshin Crater, Ussr, Irghizites, Zhamanshinites, Craters, Neutron Activation Analysis, Rare Earth Elements, Characteristics, Origin, Tektites, Geology, Data, Procedure, Silicon, Chemistry, Composition, Trace Elements, Impacts, Melting, Glasses
Scientific paper
Two irghizites, three zhamanshinites and one sample each of lechatelierite, vein-quartz, Palaeogene silty clay and Palaeogene quartzite are analyzed using neutron activation analysis. A silicate analysis of the Palaeogene silty clay is carried out, as is an incomplete analysis of the Palaeogene quartzite from the Zhamanshin impact crater. The REE abundances of the irghizites are found to resemble those of sedimentary rocks. It is noted that on the Koehler and Raaz diagram all projection points of the irghizites lie inside the field of tektites and indicate that they were derived from terrestrial sedimentary rocks. The Zhamanshin impact glasses are divided into three types: silica-rich zhamanshinites, zhamanshinites, and silica-poor zhamanshinites. It is pointed out that these are also characterized by varying proportions of alkalis and Al, Mn, and Ca contents. Irghizites and silica-rich zhamanshinites show a depletion of Eu; zhamanshinites, however, do not show this depletion. It is assumed that partial melting is an important process in the origin of zhamanshinites.
Bouska Vl.
Florenskij P. V.
Povondra Pavel
Řanda Zdenek
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