On the shape of Fe-Ni grains among ordinary chondrites

Details On the shape of Fe-Ni grains among ordinary chondrites On the shape of Fe-Ni grains among ordinary chondrites

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982polre..25..319f&link_type=abstract

(Symposium on Antarctic Meteorites, 7th, Tokyo, Japan, Feb. 19, 20, 1982) National Institute of Polar Research, Memoirs, Special

Mathematics

Logic

2

Meteorites, Antarctic Meteorites, Ordinary Chondrites, Iron, Nickel, Shape, Grains

Scientific paper

The irregular shape and anisotropic orientation of Fe-Ni grains are quantitatively analyzed in eight ordinary chondrites from Antarctica: ALH-77233 (H4), ALH-77182 (H5), ALH-77115 (H6), Y-74191 (L3), ALH-77230 (L4), ALH-77254 (L5), ALH-78105 (L6), and Y-75258 (LL6). The orientation distribution of the longest axis indicates that L chondrites are more anisotropic than H chondrites. Though the values of the shape parameter (l/S to the 1.2) depends on the divider opening (d), it increases with the area for each chondrite with a fixed d of 0.01 mm. The fractal dimensions obtained for several grains in H4, H6, L4, and L6 chondrites are all about 1.4; the irregularity of the shape of Fe-Ni grains is self-similar in the range of d used. The average value of the shape parameter for each sample appears to decrease with the increase of petrologic types from 4 to 6 for both H and L chondrites.

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