Mineralogy of 100-μg Test Samples for MUSES-C Mission
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概要
- 論文の詳細を見る
We have characterized mineralogy of individual mineral grains and small mineral aggregates picked out from 1H and 2H powder test samples for Muses C mission. Total amounts we used for mineralogical characterization are approximately 100 micro g. Fourteen individual mineral grains, less than 150 micrometers in diameter, and six small mineral aggregates, less than 200 micrometers in diameter, were exposed one by one to synchrotron X-ray radiation in order to determine bulk mineralogy based on X-ray diffraction characteristics. The samples of individual mineral grains were polished and analyzed by an electron microprobe analyzer (EPMA) for quantitative analysis of major-element concentration. The samples of mineral aggregates were microtomed or crushed for detailed mineralogical observation and quantitative chemical analysis by transmission electron microscopy (TEM). All mineralogical information, including bulk mineralogy, chemical composition, and nano-scale textures, were obtained from very small quantity of test samples owing to efficient combination of the mineralogical analysis developed. Our mineralogical analysis showed that both 1H and 2H samples are silicate-rich material with minor amounts of FeNi-metal and FeS- and FeNiS-sulfide. The silicates are mostly olivine and pyroxene and rarely plagioclase. The mineral combination of the 1H and 2H samples suggests that they are similar to stony meteorites, especially chondrites. The presence of abundant coarse olivine and low-Ca pyroxene with homogeneous composition Fo(sub 77) and En(sub 78), respectively, suggests that the coarse silicate grains in the 1H sample are similar to those in equilibrated L chondrites. But there are some mineralogical features in the 1H sample inconsistent with the idea that 1H sample is powdered material of a single equilibrated L chondrite. On the other hand, there are abundant mineralogical characteristics found in the 2H test sample, indicating that 2H sample is similar to anhydrous carbonaceous chondrite with low petrologic type.
- 宇宙航空研究開発機構の論文
著者
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NAKAMURA Tomoki
Department of Earth and Planetary Sciences, Kyushu University
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中村 智樹
Department Of Earth And Planetary Science Kyushu University
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Nakamura Tomoki
Earth and Planetary Sciences, Graduate School of Science, Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Faculty Of Sciences Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Graduate School Of Science Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Science Faculty Of Science Kyushu University
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Noguchi Takaaki
Department Of Earth Sciences Ibaraki University
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Nakamura Tomoki
Department Of Earth And Planetary Sciences Graduate School Of Sciences Kyushu University
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Nakamura Tomoki
Department Of Earth And Planetary Materials Science Faculty Of Science Tohoku University
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Noguchi Takaaki
Department of Earth Science, Faculty of Science, Ibaraki University
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