Description, chemical composition and noble gases of the chondrite Nogata

Details Description, chemical composition and noble gases of the chondrite Nogata Description, chemical composition and noble gases of the chondrite Nogata

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983metic..18...87s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 18, June 30, 1983, p. 87-102.

Mathematics

Logic

8

Chondrites, Meteoritic Composition, Rare Gases, Abundance, Chemical Composition, Isotopes, Mass Ratios, Mineralogy, Olivine, Petrology, Pyroxenes, Radiogenic Materials, Meteorites, Chemistry, Composition, Rare Gases, Nogata, Descriptions, Ordinary Chondrites, Iron, Comparisons, Mineralogy, L Chondrites, Features, Structure, Texture, Petrology, Shock, Classification, Ages, Exposure Age, Metamorphism

Scientific paper

Microscopic, electron-microprobe, chemical-composition, and noble-gas-isotopic-abundance studies of a 20-g sample of the ordinary chondrite Nogata are reported. The historical report of the fall of the chondrite at Nogata, Japan in the year 861 is supported by C-14 dating of the wooden box in which it has been stored in a Shinto shrine. The measurement data are presented in tables and discussed. Except for a low Fe content, the chemical composition and petrological structure of the chondrite are consistent with an L6 classification. Nogata is found to be more lightly shocked and to contain relatiely more radiogenic and spallogenic noble gases than other L chondrites. The gas-retention ages calculated for Nogata are 4.5 (He-4) and 4.7 (Ar-40) x 10 to the 9th years; the cosmic-ray-exposure age is about 4 x 10 to the 7th years. It is suggested that the metamorphism of the chondrite was completed within about 10 to the 8th years of the formation of its parent body.

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