@inproceedings{oai:jaxa.repo.nii.ac.jp:00020415,
 author = {宮本, 正道 and 三河内, 岳 and Miyamoto, Masamichi and Mikochi, Takashi and Jones, R. H.},
 book = {Proceedings of the ISAS lunar and planetary symposium},
 month = {},
 note = {The 41st ISAS Lunar and Planetary Symposium (August 6-8, 2008. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)), We developed a new model to calculate the cooling rate (or burial depth) by using the Fe-Mg chemical zoning profile of olivine considering diffusional modification during crystal growth, because chemical zoning provides information on thermal history of minerals. Although dynamic crystallization experiments are useful for estimating the cooling rate, experimental results only show the possibility of the cooling rate. It is, therefore, important to determine the cooling rate of actual olivines in rocks. We applied our model to calculating the cooling rate for olivines of type II porphyritic olivine chondrules in the Semarkona (LL 3.00) ordinary chondrite. The cooling rates show a wide range from 0.8 C/h to 2400 C/h for olivines in different chondrules. Although these results are broadly consistent with those obtained by dynamic crystallization experiments, the lower limit of the calculated cooling rate, 0.8 C/h, is about one order magnitude slower than experimental results. Our result suggests that each chondrule formed in different environmental conditions and assembled in Semarkona after chondrule formation., 資料番号: AA0064291036},
 pages = {155--158},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)},
 title = {The cooling rate of chondrules in Semarkona (LL 3.00) ordinary chondrite as inferred from Fe-Mg zoning of olivine},
 volume = {41},
 year = {2009}
}