A Preliminary Mineralogical Examination of the Yamato-74 Achondrites
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概要
- 論文の詳細を見る
Seven diogenites, two eucritic polymict breccias and one pallasite have been identified in the Yamato-74 meteorites by the electron microprobe and single crystal X-ray diffraction techniques. The texture of Yamato-74010,-74011,-74013,-74037,-74097,-74136 and -74648 is unlike those of the other diogenites. It is not brecciated and texturally the pyroxene seems to have recrystallized to a granoblastic texture with small change in mineral composition. The chemical composition of the orthopyroxenes in these diogenites falls in the range (Ca)_<1.9> (Mg)_<75.1> (Fe)_<23.0> to (Ca)_<3.0> (Mg)_<71.0> (Fe)_<26.0>. The chemistry and textures of these diogenites are the same as those of the Yamato-6902 (b) diogenite previously reported. These Yamato diogenites may represent fragments of the same fall. Yamato-74159 is a polymict breccia which contains mineral and lithic clasts common to eucrites. The Yamato-74450 eucrite shows a variolitic texture, indicating a rapid solidification near the surface of its parent body. A brecciated part containing a pigeonite crystal with augite lamellae is also found in small amounts. The pyroxene trends of Yamato-74450 resemble those of the Pasamonte eucrite. The Yamato-74044 pallasite is the only stony-iron meteorite among the Yamato collection. A preliminary examination of the Yamato-75 meteorites identified one iron-rich diogenite and two eucritic polymict breccias. Yamato-75032 is the most Fe-rich of any known diogenite.
- 国立極地研究所の論文
著者
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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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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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Haramura Hiroshi
Geological Institute, Faculty of Science, University of Tokyo
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Haramura Hiroshi
Geological Institute Faculty Of Science University Of Tokyo
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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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Takeda Hiroshi
Mineralogical Institute Faculty Of Science University Of Tokyo
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