Japan-Korea Joint Research on Antarctic Meteorites

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Japan has collected about nine thousands of meteorites from Antarctica since 1969, and Japanese meteorite research has become active last twenty years. In contrast, Korea has few meteorites, and the meteorite research was not so active in Korea. Korea, however, has a plan to collect many meteorites from Antarctica in future, and Korean side scientists were very eager about establishing a Korea-Japan joint research on Antarctic meteorites.The objectives of this study were Japan-Korea joint-research on Japanese Antarctic meteorites in order to promote the activity of meteorite research in both Korea and Japan and to clarify the formation and evolution of meteorite parent bodies and protoplanets.The head investigator of this project, Prof.Y.Ikeda, visited Seoul National University to make an arrangement of the Japan-Korea joint research from September 24,1994 to October 11, and another Japanese investigator, Associate Prof.M.Kimura, also visited Seoul National University and Korean Ocean Research and Development Institute to carry out the mineralogical study on Antarctic meteorites from March 2,1995 to March 9. On the other hand, the head invetigator of the Korean side project, Prof.M.S.Lee, visited Ibaraki Unversiry, Tokyo University, and National Institute of Polar Research (Tokyo) to promote the Japan-Korea joint research from December 23,1994 to January 22,1995.We carried out the mineralogical and petrological studies on unequilibrated and equilibrated chondites and HED meteorites, using an electron-probe microanalyzer. Among them, the Yamato-8449 meteroite was a rare CR chondrite, and we studied the hydration of chondrule glass in the meteorite and concluded that the hydration took place in the early solar nebula prior to the accretion on to the parent body. The Yamato-75011 meteorite is a unique polymict eucrite, and the petrological study revealed that it was produced on the surface region of the HED parent body, probably No.4 asteroid Vesta.