Two new chondrite-falls in Japan

Details Two new chondrite-falls in Japan Two new chondrite-falls in Japan

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986metic..21...59s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 21, March 31, 1986, p. 59-78. Research supported by the Ministry of Education, Science, and C

Mathematics

Logic

5

Chemical Composition, Chondrites, Meteoritic Composition, Abundance, Chemical Analysis, Chondrule, Japan, Mineralogy, Petrography, Meteorites, Stony Meteorites, L Chondrites, H Chondrites, Chemistry, Classification, Major Elements, Mineralogy, Composition, Aomori, Matrix, Tomoya, Description, Samples, Meteorite, Chondrules, Ordinary Chondrites, Petrology, Texture, Deformation, Shock Effects, Trace Elements, Nuclides, Rare Gases, Abundance, Concentration, Catalog

Scientific paper

Circumstances of two recent chondrite falls in the northern part of Honshu, Japan, are reported, the first (Aomori) at 1:50 p.m. on June 30, 1984 and the second (Tomiya) at 1:35 p.m. on August 22, 1984. Results of chemical analyses of major elements and composition ratios indicate that the meteorites are typical L- and H-group ordinary chondrites, respectively. In the Aomori, chondrules are present as relicts in the well-crystallized matrix. Olivine and pyroxene are homogeneous in composition, and coarse clear feldspar, up to 100 micrometers in size, is wll developed in the chondrules and matrix. Though the Aomori is a petrologic type 6 based on its texture and mineralogy, it includes a few grains of multiple twinned clinbronzite which is rarely observed in high equilibrated ordinary chondrites. In the Tomiya, chondrules possess a fine-grained mesostasis, and both orthopyroxene and clinobronzite are noticeable in thin sections; this meteorite was classified to be petrologic type between 4 and 5. The deformation texture of olivine, pyroxene and plagioclase indicates that both meteorites were shocked by 0.2-0.25 Mb. In conjunction with the discussion of the frequency of meteorite falls, all observed falls of meteorites in Japan are tabulated.

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