Mineral chemistry of inclusions in the new iron meteorite Chlumec

Details Mineral chemistry of inclusions in the new iron meteorite Chlumec Mineral chemistry of inclusions in the new iron meteorite Chlumec

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.535s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 535

Other

Chemical Composition, Inclusions, Iron Meteorites, Meteoritic Composition, Chromites, Glass, Kamacite, Olivine, Pyroxenes, Silicates, Troilite, X Ray Diffraction

Scientific paper

A lump of an iron found near Chlumec nad Cidlinou (Czech Republic) last year contains a large number of inclusions of three types. SiO2 corresponds according to X-ray powder diffraction data to tridymite and to quartz. In inclusion 1, orthopyroxenes show a wide compositional range. Inclusion 2 contains both predominant OPX and rare low-Ca CPX. The Si-Al-Ca phase also contains Mg, Fe, K, and Na and occurs in both types of the silicate inclusions. Olivine occurs only in inclusion 1 and it is extremely rare. Chromite was found in several inclusions of the type 2. It contains except Cr, Al, Fe, and Mg also small amounts of Mn, Zn, and Si. Troilite is uniform in composition and contains Cr and Ni. Kamacite droplets are very variable even in a given inclusion ranging in Ni content. Moreover, there are several spherules with considerably high Cr content. Elemental C occurs in the first type of inclusions in form of blebs among grains of silicates and glasses. No other elements were found in these C particles. There are several strong arguments supporting an extraterrestrial origin: (1) chemical composition of pyroxenes with Cr in the M site showing extreme conditions of formation, (2) coexisting silica and pyroxene in the 'quenched' inclusions, (3) the Si-Al-Ca-glasses with a trend of alkalis like in impact glasses, (4) coexisting fayalite and enstatite in inclusions of type 1, (5) Fe droplets in silicates suggesting superheating reduction, (6) porous C-bearing inclusions similar to some interplanetary dust particles (IDP's).

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