@article{oai:nipr.repo.nii.ac.jp:00005897,
 author = {Kaiden,Hiroshi and Mikouchi,Takashi and Nomura,Koji and Miyamoto,Masamichi},
 journal = {Antarctic meteorite research},
 month = {Sep},
 note = {P(論文), The chemical zoning profiles of olivines in the Yamato (Y)-791717 CO3 chondrite have been analyzed in order to explore its thermal history. Two alternative models were applied to distinguish igneous processes from metamorphic features; they are fractional crystallization and diffusive modification of primary composition. It was clarified that chemical zoning of olivines in Y-791717 has been formed by a diffusion process, suggesting that this meteorite has been thermally metamorphosed. Thermal metamorphism of Y-791717 we have shown is consistent with that proposed on the basis of thermoluminescence investigation. A diffusion model also allows us to examine its thermal history in a quantitative way. Using a diffusion model, we have most successfully reproduced measured zoning profiles in isolated and chondrule olivine grains from Y-791717 in the temperature range 800-300℃. The temperature range is broadly consistent with the previously proposed peak metamorphic temperatures for CO3 chondrites.},
 pages = {181--190},
 title = {Chemical zoning of olivines in the Yamato-791717 CO3 chondrite},
 volume = {10},
 year = {1997}
}