Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29q.530s&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 530
Mathematics
Logic
Antarctic Regions, Carbonaceous Chondrites, Hyperfine Structure, Metamorphism (Geology), Meteoritic Composition, Oxygen Isotopes, Chemical Composition, Magnetic Signatures, Mineralogy, Mossbauer Effect, Petrology, Temperature Effects
Scientific paper
The Antarctic meteorites Yamato (Y) 86720, Y 82162, and Belgica (B) 7904 are unique samples that do not fit in the traditional classification scheme. All three have characteristics of both CI and CM groups or an intermediate nature between the two. Based on the O isotopic compositions their characteristics are similar to those of non-Antarctic CI chondrites. However, Y 86720 and B 7904 are similar in mineralogy and chemistry to CM chondrites, while Y 82162 resembles normal CI chondrites. According to mineralogical studies, B 7904, Y 82162, and Y 86720 are thermally metamorphosed to various degrees. In addition, Y 86720 is genetically related to B 7904. We report preliminary results of Fe-57 Mossbauer spectroscopy measurements on B 7904 carbonaceous chondrite compared to previous reported data on Y 82162, and Y 86720. The Mossbauer spectrum at room temperature of B 7904 is generally very similar to the above-cited Yamato meteorites, indicating the presence of a magnetically split component due to Fe in sulfides and two quadrupole doublets attributed to Fe(2+) and Fe(3+) compounds. The magnetic signature can be ascribed to Fe in troilite, while the hyperfine parameters of the most intense doublet are in accordance with Fe(2+) in olivines. Through the comparison of the hyperfine parameters of B 7904, Y 86720, and Y 82162, it is possible to have some indication about their thermal history. Our Mossbauer results seem to be in agreement with the relative order of heating obtained by Paul and Lipschutz, B 7904 less than Y 82162 less than Y 86720, which are against high-temperature metamorphism of B 7904 or thermal metamorphism of long duration.
Azevedo Souza I.
Scorzelli R. B.
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