著者

宮本 正道

出版者

一般社団法人 日本鉱物科学会

雑誌

鉱物学雜誌 (ISSN:04541146)

巻号頁・発行日

vol.24, no.4, pp.259-263, 1995-10-31 (Released:2009-08-11)

参考文献数

18

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The method to estimate the cooling rate of meteorites on the basis of atomic diffusion in minerals is summarized. The best-fit cooling rate and burial depth are obtained by fitting a profile calculated by solving the diffusion equation to the observed chemical gradient and the width of lamellae measured by electron microprobe. The thickness of a eucntic crust of the HED parent body was estimated to be about 10 km from augite exsolution in pyroxene. A rapid cooling of a few hundreds °C/yr for pallasite was obtained on the basis of chemical zoning in olivine. Some problems with estimation of the cooling rate are also reviewed.