Keizo Yanai | Researchain

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Earth, Planets and Space | 2005

Widespread magmatic activities on the angrite parent body at 4562 Ma ago

N. Sugiura; Akiko Miyazaki; Keizo Yanai

Mn-Cr chronology of four quenched angrites showed that they formed nearly at the same time (4562 Ma) on the surface of the parent-body. Based on the chemical compositions, the cosmic ray exposure ages, and considerations on the thermal history of an achondrite parent-body, we suggest that the four angrites formed on top of a shallow magma ocean on the angrite parent body.

Proceedings of the NIPR Symposium on Antarctic Meteorites | 1991

Varieties of lunar meteorites recovered from Antarctica

Keizo Yanai; Hideyasu Kojima

Proceedings of the NIPR Symposium on Antarctic Meteorites | 1995

Yamato-8451: A newly identified pyroxene-bearing pallasite

Keizo Yanai; Hideyasu Kojima

Proceedings of the NIPR Symposium on Antarctic Meteorites | 1993

Mineralogy of Antarctic aubrites, Yamato-793592 and Allan Hills-78113: Comparison with non-Antarctic aubrites and E-chondrites

Makoto Kimura; Yangting Lin; Yukio Ikeda; Ahmed El Goresy; Keizo Yanai; Hideyasu Kojima

Mineralogical Journal | 1997

General view of twelve martian meteorites

Keizo Yanai

Archive | 1990

Petrology of unique meteorites, Y-74063, Y-74357, Y-75261, Y-75274, Y-75300, Y-75305, A-77081, A-78230, and Y-8002.

Hiroko Nagahara; Takaaki Fukuoka; Ichiro Kaneoka; Midori Kimura; Hideyasu Kojima; Ikuo Kushiro; H. Takeda; Akira Tsuchiyama; Keizo Yanai

Mineralogical Journal | 1997

Mineralogical consideration of possible microfossils in martian meteorite ALH84001

Takashi Mikouchi; Akira Tsuchiyama; Junji Akai; Satoru Nakashima; Kazue Tazaki; Tetsumaru Itaya; Keizo Yanai

Archive | 1990

Varieties of the lunar meteorites collected from Antarctica.

Keizo Yanai; Hideyasu Kojima

Annual Meeting of the Geological Society of Japan The 119th Annual Meeting(2012' Osaka) | 2012

Geology of the Aniai district, Akita Prefecture, NE Japan

Kazuhiko Kano; Takeshi Ohguchi; Yohei Ishikawa; Keizo Yanai; Yukio Fujimoto; Kazuhiko Uemura; Kenshiro Ogasawara

Archive | 2006

Thermoluminescence Study in the Japanese Antarctic Meteorites Collection: Asuka Ordinary Chondrites

Kiyotaka Ninagawa; Naoya Imae; Haruo Kojima; Keizo Yanai; A. J. Timothy Jull

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