Mineralogical Examination of the Yamato-75 Achondrites and Their Layered Crust Model
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概要
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One Fe-rich diogenite and two polymict breccias with eucritic composition have been identified in the Yamato-75 achondrites by the electron microprobe and single crystal X-ray diffraction techniques. The Yamato-75032 diogenite, a monomict breccia, contains a low-Ca inverted pigeonite with a chemical composition close to that of Binda, and a possible primary orthopyroxene. Yamato-75011 and -75015 are polymict breccias which contain mineral and lithic clasts common to eucrites. Binda-like pyroxene fragments were found in Yamato-75015,suggesting that it may represent a variety of materials expected from our layered crust model containing diogenite, Binda-type, Moore County-type, Juvinas-type and Pasamonte-type pyroxenes from bottom to top. Yamato-74659 may be classified as a weathered pyroxene-rich ureilite, which contains the most Mg-rich uninverted pigeonite. The exsolution and shock induced twinning were not observed. Yamato-74123 is another ureilite similar to Kenna.
- 国立極地研究所の論文
著者
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MATSUMOTO Yukio
Department of Preventive Medicine and Public Health, School of Medicine, Keio University
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Miyamoto Masamichi
Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo
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TAKEDA Hiroshi
Research Institute, Chiba Institute of Technology
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Ishii Teruaki
Ocean Research Institute, University of Tokyo
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Takeda Hiroshi
Mineralogical Institute, University of Tokyo
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Yanai Keizo
National Institute of Polar Research
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Takeda Hiroshi
Department Of Earth And Planetary Science The University Of Tokyo
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Ishii Teruaki
Ocean Research Institute The University Of Tokyo
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Matsumoto Yukio
Department Of Geology Faculty Of Liberal Arts Nagasaki University
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Miyamoto Masamichi
Department Of Earth And Planetary Science The University Of Tokyo
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Miyamoto Masamichi
Space And Planetary Science Graduate School Of Science University Of Tokyo
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Miyamoto Masamichi
Department Of Earth And Planetary Science Graduate School Of Science University Of Tokyo
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Matsumoto Yukio
Department Of Anesthesiology Fukushima Medical University School Of Medicine
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Takeda Hiroshi
Mineralogical Institute Faculty Of Science University Of Tokyo
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