Mineralogy, petrography and chemistry of the chondrite, Kamiomi, Sashima-gun, Ibaraki-ken, Japan

Details Mineralogy, petrography and chemistry of the chondrite, Kamiomi, Sashima-gun, Ibaraki-ken, Japan Mineralogy, petrography and chemistry of the chondrite, Kamiomi, Sashima-gun, Ibaraki-ken, Japan

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979metic..14..177o&link_type=abstract

Meteoritics, vol. 14, June 30, 1979, p. 177-191.

Mathematics

Logic

Chemical Composition, Chondrites, Mineralogy, Petrography, Abundance, Crystallization, Electron Microscopy, Japan, Metals, Olivine, Petrology, Photomicrography, Tables (Data)

Scientific paper

The Kamiomi, Sashima-gun (Iwai-shi), Ibaraki-ken, Japan, chondrite (observed to fall in spring, during the period 1913-6), consists of olivine, orthopyroxene, nickel-iron and troilite with minor amount of plagioclase, clinopyroxene, apatite and chromite. The average molar composition of olivine (Fa19) and orthopyroxene (Fs17) indicates that Kamiomi is a typical olivine bronzite chondrite.
From the well-recrystallized texture, the presence of poorly-definable chondrules, homogeneous composition of olivine and absence of glass, this chondrite could be classified in petrologic type 5.
The bulk chemical composition, especially, total Fe (27.33%) and metallic Fe (17.00%) as well as Fetotal/SiO2(0.72), Femetal/Fetotal(0.633) and SiO2/MgO (1.59) support the above conclusion.
Coexistence of heavily-shocked olivine grains in the matrix composed of olivines and pyroxenes which suffered from light to moderate shock effect suggest that impacting phenomena, small-scaled but locally strong, occurred on the Kamiomi parent body.

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