Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29..488k&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 488-489
Other
Geochemistry, Iron Compounds, Metallography, Meteoritic Composition, Electron Probes, Neutron Activation Analysis, Radioactive Age Determination, Troilite, X Ray Analysis
Scientific paper
A peculiar iron was recently found in Chlumec Cidlinou, Czech Republic. It is rich in silicate inclusions and contains some C-rich inclusions. There are abundantly present large, irregularly shaped voids. The silicate and C inclusions are described. We report on the bulk metal composition and the metal texture. Analysis of the metal with an electron microprobe revealed a fairly homogeneous composition with an average Ni content of 9.3 wt% and a Ni/Co ratio of 37. The metal contains Cr but little Si and P. Troilite is always Cr-bearing with highly variable Cr-contents ranging from 1 to 75 wt%. The Ni content ranges from 0.3 to 1.5 wt%. Bulk trace-element contents of a metal-rich sample as determined by Instrumental Neutron Activation Analysis (INAA) are plotted. The refractory siderophile elements are strongly fractionated, as are the volatile elements. Chlumec does not fit any known Fe meteorite group. Chlumec certainly has a texture untypical for either Fe meteorite or technical product. The original granular texture has been mechanically deformed. The Chlumec metal could also have been exposed to shock. It does not resemble any modern steel known to us. The Cr contents of the metal and the troilite indicate fairly reducing conditions, which is contradicted by the presence of Fe-rich silicates. The high contents of Sb, As, Mo, and W could indicate a terrestrial origin. On the other hand, the presence of Ir and high contents of Pt as well as the only slightly fractionated Ni/Co ratio seem to point toward an extraterrestrial origin.
Brandstatter Frans
Bukovanska M.
Kurat Gero
Palme Herbert
Sperl G.
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