@article{oai:nipr.repo.nii.ac.jp:00004550,
 author = {Ikeda, Yukio and Kojima, Hideyasu},
 journal = {Proceedings of the NIPR Symposium on Antarctic Meteorites},
 month = {Mar},
 note = {P(論文), Terrestrial alteration of Fe-Ni metals to limonites in ordinary chondrites is faster for kamacite than for taenite. H chondrites which have high ratios of kamacite/taenite alter more easily than LL chondrites which have the low ratios, L chondrites being intermediate. Qualitative weathering indices, A, B, and C, correspond to measured average alteration degrees (proportion of metal converted to limonite) of <5%, 10-20%, and >50%, respectively. The surfaces of chondritic meteorites show higher degrees in alteration of Fe-Ni metals than the interiors, although the difference in the degree is merely a factor of two. There is no correlation between the average alteration degrees and the terrestrial ages for H and L chondrites, but the average alteration degree seem to depend upon the degrees of impact shocks which the chondrites had suffered in or on the parent body.},
 pages = {307--318},
 title = {Terrestrial alteration of Fe-Ni metals in Antarctic ordinary chondrites and the relationship to their terrestrial ages},
 volume = {4},
 year = {1991}
}