Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.532s&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 532-533
Other
1
Chemical Composition, Chondrites, Meteoritic Composition, Meteoroid Showers, Radioactive Isotopes, Mineralogy, Petrology, Radioactive Age Determination, Rare Gases
Scientific paper
A stone has been kept in a household altar of the Suda family in Takanashi, Senboku-machi, Senboku-gun, Akita-ken, Japan. The stone came from the sky into the chestnut grove in the dry Maruko river bed. The chondrite Shiraiwa was found in 1920 at approximately 60 cm depth under the field behind a Gosha shrine, at Shiraiwa, Kakunodate-machi, Senboku-gun, Akita-ken, Japan. We have checked the two chondrites to see whether they are from the same fall or not because Senboku and Shiraiwa are the only meteorites found in Akita-ken, and were found only 17 km apart; the time of fall of both are unknown; and both chondrites belong to the H group. Because both chondrites fell more than 70 years ago, cosmogenic radioactive nuclides other than Al-26 were not detected. Aluminum-26 data in both chondrites were compared with a gamma ray standard in respective samples. Obtained results are as follows: Shiraiwa 41.5 +/- 5.3 and Senboku 51.4 +/- 2.6. The concentration and isotopic composition of noble gases of Senboku were determined and compared with that of Shiraiwa. Production rates for He-3 and Ne-21 by Eugster and that for Ar-38 by Schultz et al. were used for age calculation. Although Shiraiwa has data by M. Watanabe as well as by Saga and Kano, who classified it as H4, we are now looking at their data for comparison. For Senboku, we have determined 30 grains of olivine and 40 grains of orthopyroxene and obtained mean Fa and Fs ratios by atomic percent as 18.4 +/- 0.5 and 16.3 +/- 0.6 respectively. From the presence of colorless clear plagioclase in matrix, Senboku was classified as H6. From the results, we have concluded that Shiraiwa and Senboku are completely different falls.
Ebihara Mitsuru
Honda Makoto
Miura Yayoi N.
Okada Akihiko
Shima Masako
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