Mineralogy and crystallography of some Itokawa particles returned by the Hayabusa asteroidal sample return mission
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- 作者：Takashi Mikouchi ; Mutsumi Komatsu ; Kenji Hagiya…
- 关键词：Itokawa ; Hayabusa ; Olivine ; Plagioclase ; SR ; XRD ; SR ; XANES ; LL chondrites
- 刊名：Earth, Planets and Space
- 出版年：2014
- 出版时间：December 2014
- 年：2014
- 卷：66
- 期：1
- 全文大小：867KB
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Nakamura T, Nakato A, Ishida H, Wakita S, Noguchi T, Zolensky ME, Tanaka M, Kimura M, Tshuchiyama A, Ogami T, Hashimoto T, Konno M, Uesugi M, Yada T, Shirai K, Fujimura A, Okazaki R, Sandford SA, Ishibashi Y, Abe M, Okada T, Ueno M, Kawaguchi J: Mineral chemistry of MUSES-C Regio inferred from analysis of dust particles collected from the first- and second-touchdown sites on asteroid Itokawa. Meteorit Planet Sci 201 - 作者单位：Takashi Mikouchi (1)
Mutsumi Komatsu (2)
Kenji Hagiya (3)
Kazumasa Ohsumi (4)
Michael E Zolensky (5)
Viktor Hoffmann (6) (7)
James Martinez (8)
Rupert Hochleitner (9)
Melanie Kaliwoda (9)
Yasuko Terada (4)
Naoto Yagi (4)
Masaki Takata (4)
Wataru Satake (1)
Yuya Aoyagi (1)
Atsushi Takenouchi (1)
Yuzuru Karouji (10)
Masayuki Uesugi (10)
Toru Yada (10)
1. Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
2. Waseda Institute for Advanced Study, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan
3. School of Science, University of Hyogo, 3-2-1 Kouto, Kamigori-cho, Ako-gun, Hyogo, 678-1297, Japan
4. Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
5. Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX, 77058, USA
6. Department of Earth and Environmental Sciences, Section Geophysics, Ludwig Maximillian’s University Munich (LMU), Theresienstr. 41, Munich, 80333, Germany
7. Department of Geosciences, Eberhard Karls University of Tübingen, H?lderlinstr. 12, Tübingen, 72074, Germany
8. ESCG Jacobs, Houston, TX, 77058, USA
9. Mineralogical State Collection, Theresienstr 41, Munich, 80333, Germany
10. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, 252-5210, Japan - 刊物类别：Earth Sciences, general; Geology; Geophysics/Geodesy;
- 刊物主题：Earth Sciences, general; Geology; Geophysics/Geodesy;
- 出版者：Springer Berlin Heidelberg
- ISSN：1880-5981
文摘
We studied seven Itokawa particles provided by the Japan Aerospace Exploration Agency (JAXA) as first International Announcement of Opportunity (AO) study mainly using electron and synchrotron radiation X-ray beam techniques. All the analyzed particles were collected from the first-touchdown site and composed of olivine and plagioclase with traces of Ca phosphate and chromite, and do not contain pyroxenes. Optical microscopy of these particles shows minor undulatory extinction of olivine and plagioclase, suggesting minor shock metamorphism (shock stage: S2). The electron microprobe analysis shows that olivine is Fo70-73 and plagioclase is An13-10Or5-7. The synchrotron radiation X-ray diffraction (SR-XRD) analysis of olivine crystals gives cell dimensions of a--.708 to 4.779 ?, b--0.271 to 10.289 ?, c--.017 to 6.024 ?, corresponding to the Fo content of Fo~70 by Vegard's law. This composition matches the result obtained by the electron microprobe analysis. The olivine compositions of the analyzed particles are consistent with those of LL chondrites. The cell dimensions of two plagioclase crystals (a--.180 to 8.194 ?, b--2.53 to 12.893 ?, c--.125 to 7.23 ?, α--2.6° to 93.00°, β--16.36° to 116.75°, γ--0.03° to 90.17°) indicate that their equilibration temperatures are 800°C?±-0°C. This temperature is near the peak metamorphic temperature recorded by equilibrated ordinary chondrites. The size of plagioclase crystals and the homogeneity of olivine compositions indicate that their petrologic type is ?. We also analyzed plagioclase by SR iron X-ray absorption near-edge structure (SR-XANES) and found that its Fe3+/(Fe2+ + Fe3+) ratio is approximately 0.5. Such high Fe3+ abundance indicates the formation under a relatively oxidizing environment. Thus, all these analyses have reconfirmed that the Itokawa particles returned by the Hayabusa spacecraft are very weakly shocked equilibrated LL chondrites, which matches the results of the preliminary examination team. Keywords Itokawa Hayabusa Olivine Plagioclase SR-XRD SR-XANES LL chondrites