34 results on '"Amano, Kana"'
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2. Three-dimensional textures of Ryugu samples and their implications for the evolution of aqueous alteration in the Ryugu parent body
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Tsuchiyama, Akira, Matsumoto, Megumi, Matsuno, Junya, Yasutake, Masahiro, Nakamura, Tomoki, Noguchi, Takaaki, Miyake, Akira, Uesugi, Kentaro, Takeuchi, Akihisa, Okumura, Shota, Fujioka, Yuri, Sun, Mingqi, Takigawa, Aki, Matsumoto, Toru, Enju, Satomi, Mitsukawa, Itaru, Enokido, Yuma, Kawamoto, Tatsuhiko, Mikouchi, Takeshi, Michikami, Tatsuhiro, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Rubino, Stefano, Dionnet, Zelia, Aléon-Toppani, Alice, Brunetto, Rosario, Zolensky, Michael E., Nakano, Tsukasa, Nakano, Naoto, Yurimoto, Hisayoshi, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Nakazawa, Satoru, Terui, Fuyuto, Tachibana, Shogo, Watanabe, Sei-ichiro, and Tsuda, Yuichi
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- 2024
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3. Correlated IR-SEM-TEM studies of three different grains from Ryugu: From the initial material to post-accretional processes
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Aléon-Toppani, Alice, Brunetto, Rosario, Dionnet, Zélia, Rubino, Stefano, Baklouti, Donia, Brisset, François, Vallet, Maxime, Heripre, Eva, Nakamura, Tomoki, Lantz, Cateline, Djouadi, Zahia, Borondics, Ferenc, Sandt, Christophe, Troadec, David, Mivumbi, Obadias, Matsumoto, Megumi, Amano, Kana, Morita, Tomoyo, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohira, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Watanabe, Sei-ichiro, and Tsuda, Yuichi
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- 2024
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4. Space weathering acts strongly on the uppermost surface of Ryugu
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Matsuoka, Moe, Kagawa, Ei-ichi, Amano, Kana, Nakamura, Tomoki, Tatsumi, Eri, Osawa, Takahito, Hiroi, Takahiro, Milliken, Ralph, Domingue, Deborah, Takir, Driss, Brunetto, Rosario, Barucci, Antonella, Kitazato, Kohei, Sugita, Seiji, Fujioka, Yuri, Sasaki, Osamu, Kobayashi, Shiho, Iwata, Takahiro, Morota, Tomokatsu, Yokota, Yasuhiro, Kouyama, Toru, Honda, Rie, Kameda, Shingo, Cho, Yuichiro, Yoshioka, Kazuo, Sawada, Hirotaka, Hayakawa, Masahiko, Sakatani, Naoya, Yamada, Manabu, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Shirai, Kei, Lantz, Cateline, Rubino, Stefano, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Watanabe, Sei-ichiro, and Tsuda, Yuichi
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- 2023
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5. Visualization of nanoscale magnetic domain states in the asteroid Ryugu
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Kimura, Yuki, Kato, Takeharu, Tanigaki, Toshiaki, Akashi, Tetsuya, Kasai, Hiroto, Anada, Satoshi, Yoshida, Ryuji, Yamamoto, Kazuo, Nakamura, Tomoki, Sato, Masahiko, Amano, Kana, Kikuiri, Mizuha, Morita, Tomoyo, Kagawa, Eiichi, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Watanabe, Sei-ichiro, Tsuda, Yuichi, and Tachibana, Shogo
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- 2023
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6. Small grains from Ryugu: handling and analysis pipeline for infrared synchrotron microspectroscopy
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Rubino, Stefano, Dionnet, Zélia, Aléon-Toppani, Alice, Brunetto, Rosario, Nakamura, Tomoki, Baklouti, Donia, Djouadi, Zahia, Lantz, Cateline, Mivumbi, Obadias, Borondics, Ferenc, Lefrançois, Stephane, Sandt, Christophe, Capitani, Francesco, Héripré, Eva, Troadec, David, Matsumoto, Megumi, Amano, Kana, Morita, Tomoyo, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Seiichiro, and Tsuda, Yuichi
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- 2023
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7. Chondrule-like objects and Ca-Al-rich inclusions in Ryugu may potentially be the oldest Solar System materials
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Nakashima, Daisuke, Nakamura, Tomoki, Zhang, Mingming, Kita, Noriko T., Mikouchi, Takashi, Yoshida, Hideto, Enokido, Yuma, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Nakazawa, Satoru, Terui, Fuyuto, Yurimoto, Hisayoshi, Noguchi, Takaaki, Yabuta, Hikaru, Naraoka, Hiroshi, Okazaki, Ryuji, Sakamoto, Kanako, Watanabe, Sei-ichiro, Tachibana, Shogo, and Tsuda, Yuichi
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- 2023
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8. The thermal history of Ryugu based on Raman characterization of Hayabusa2 samples
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Bonal, Lydie, Quirico, Eric, Montagnac, Gilles, Komatsu, Mutsumi, Kebukawa, Yoko, Yabuta, Hikaru, Amano, Kana, Barosch, Jens, Bejach, Laure, Cody, George D., Dartois, Emmanuel, Dazzi, Alexandre, De Gregorio, Bradley, Deniset-Besseau, Ariane, Duprat, Jean, Engrand, Cécile, Hashiguchi, Minako, Kamide, Kanami, Kilcoyne, David, Martins, Zita, Mathurin, Jérémie, Mostefaoui, Smail, Nittler, Larry, Ohigashi, Takuji, Okumura, Taiga, Remusat, Laurent, Sandford, Scott, Shigenaka, Miho, Stroud, Rhonda, Suga, Hiroki, Takahashi, Yoshio, Takeichi, Yasuo, Tamenori, Yusuke, Verdier-Paoletti, Maximilien, Yamashita, Shohei, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Yurimoto, Hisayoshi, Tachibana, Shogo, Abe, Masanao, Miyazaki, Akiko, Nakato, Aiko, Nakazawa, Satoru, Nishimura, Masahiro, Okada, Tatsuaki, Saiki, Takanao, Sakamoto, Kanako, Tanaka, Satoshi, Terui, Fuyuto, Tsuda, Yuichi, Usui, Tomohiro, Watanabe, Sei-ichiro, Yada, Toru, Yogata, Kasumi, and Yoshikawa, Makota
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- 2024
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9. Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method
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Ishizaki, Takuya, Nagano, Hosei, Tanaka, Satoshi, Sakatani, Naoya, Nakamura, Tomoki, Okada, Tatsuaki, Fujita, Ryohei, Alasli, Abdulkareem, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, and Tsuda, Yuichi
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- 2023
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10. Trace-element analysis of mineral grains in Ryugu rock fragment sections by synchrotron-based confocal X-ray fluorescence
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Bazi, Benjamin, Tack, Pieter, Lindner, Miles, Vekemans, Bart, De Pauw, Ella, Tkalcec, Beverley, Brenker, Frank E., Garrevoet, Jan, Falkenberg, Gerald, Yabuta, Hikaru, Yurimoto, Hisayoshi, Nakamura, Tomoki, Amano, Kana, Matsumoto, Megumi, Fujioka, Yuri, Enokido, Yuma, Nakashima, Daisuke, Uesugi, Masayuki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Tachibana, Shogo, Watanabe, Sei-ichiro, Tsuda, Yuichi, and Vincze, Laszlo
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- 2022
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11. Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission
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Tack, Pieter, De Pauw, Ella, Tkalcec, Beverley, Lindner, Miles, Bazi, Benjamin, Vekemans, Bart, Brenker, Frank, Di Michiel, Marco, Uesugi, Masayuki, Yurimoto, Hisayoshi, Nakamura, Tomoki, Amano, Kana, Matsumoto, Megumi, Fujioka, Yuri, Enokido, Yuma, Nakashima, Daisuke, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Watanabe, Sei-Ichiro, Tsuda, Yuichi, and Vincze, Laszlo
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- 2022
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12. AFM-IR nanospectroscopy of nanoglobule-like particles in Ryugu samples returned by the Hayabusa2 mission
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Mathurin, Jérémie, primary, Bejach, Laure, additional, Dartois, Emmanuel, additional, Engrand, Cécile, additional, Dazzi, Alexandre, additional, Deniset-Besseau, Ariane, additional, Duprat, Jean, additional, Kebukawa, Yoko, additional, Yabuta, Hikaru, additional, Bonal, Lydie, additional, Quirico, Eric, additional, Sandt, Christophe, additional, Borondics, Ferenc, additional, Barosch, Jens, additional, Beck, Pierre, additional, Cody, George D., additional, De Gregorio, Brad T., additional, Hashiguchi, Minako, additional, Kilcoyne, David A. L., additional, Komatsu, Mutsumi, additional, Martins, Zita, additional, Matsumoto, Megumi, additional, Montagnac, Gilles, additional, Mostefaoui, Smail, additional, Nittler, Larry R., additional, Ohigashi, Takuji, additional, Okumura, Taiga, additional, Phan, Van T. H., additional, Remusat, Laurent, additional, Sandford, Scott, additional, Shigenaka, Miho, additional, Stroud, Rhonda, additional, Suga, Hiroki, additional, Takahashi, Yoshio, additional, Takeichi, Yasuo, additional, Tamenori, Yusuke, additional, Verdier-Paoletti, Maximilien, additional, Yamashita, Shohei, additional, Nakamura, Tomoki, additional, Morita, Tomoyo, additional, Kikuiri, Mizuha, additional, Amano, Kana, additional, Kagawa, Eiichi, additional, Noguchi, Takaaki, additional, Naraoka, Hiroshi, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yurimoto, Hisayoshi, additional, Abe, Masanao, additional, Kamide, Kanami, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nakazawa, Satoru, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Saiki, Takanao, additional, Tachibana, Shogo, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Usui, Tomohiro, additional, Watanabe, Sei-ichiro, additional, Yada, Toru, additional, Yogata, Kasumi, additional, and Yoshikawa, Makoto, additional
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- 2024
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13. Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method
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Ishizaki, Takuya, Nagano, Hosei, Tanaka, Satoshi, Sakatani, Naoya, Nakamura, Tomoki, Okada, Tatsuaki, Fujita, Ryohei, Alasli, Abdulkareem, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, Tsuda, Yuichi, Ishizaki, Takuya, Nagano, Hosei, Tanaka, Satoshi, Sakatani, Naoya, Nakamura, Tomoki, Okada, Tatsuaki, Fujita, Ryohei, Alasli, Abdulkareem, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, and Tsuda, Yuichi
- Abstract
The thermophysical properties of small Solar System bodies are essential to be determined, on which the thermal evolution of small bodies largely depends. The carbonaceous asteroid Ryugu is one of the small undifferentiated bodies formed in the early Solar System. Hayabusa2 explored the asteroid Ryugu and returned the surface samples in 2020 for detailed on-ground investigation, including measurements of thermal properties. Because the available sample amount was limited, this study developed a novel method to measure the thermal diffusivity of small and irregularly shaped samples of about 1 mm in diameter by combining lock-in thermography and periodic heating methods on the microscale. This method enables us to measure the thermal diffusivity of both flat-plate and granular shape samples by selecting the suitable detecting direction of the temperature response. Especially, when the sample has a flat-plate shape, the anisotropic distribution of the in-plane thermal diffusivity can be evaluated. This method was applied to six Ryugu samples, and the detailed anisotropic distribution of the thermal diffusivity was obtained. The measurement results showed that the samples show local thermal anisotropy caused by cracks and voids. The average thermal diffusivity among all samples was (2.8 to 5.8) × 10^−7 m2·s. Based on the density and specific heat of the samples obtained independently, the thermal effusivity was estimated to be 791 J·(s^1/2·m^2·K) to 1253 J·(s^1/2·m^2·K), which is defined as the resistance of surface temperature to the change of thermal input. The determined thermal effusivity, often called thermal inertia in planetary science, is larger than the observed value of 225 ± 45 J· (s^1/2·m^2·K) of the asteroid Ryugu's surface, obtained from the diurnal temperature change of the rotating asteroid by a thermal infrared camera onboard Hayabuas2. This difference is likely to be attributed to the difference in the analytical scale between the sample and the surfac
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- 2024
14. Three‐dimensional multiscale assembly of phyllosilicates, organics, and carbonates in small Ryugu fragments.
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Dionnet, Zelia, Rubino, Stefano, Aléon‐Toppani, Alice, Brunetto, Rosario, Tsuchiyama, Akira, Lantz, Cateline, Djouadi, Zahia, Baklouti, Donia, Nakamura, Tomoki, Borondics, Ferenc, Sandt, Christophe, Heripre, Eva, Troadec, David, Mivumbi, Obadias, Aléon, Jérome, Ternier, Theo, Matsumoto, Megumi, Amano, Kana, Morita, Tomoyo, and Yurimoto, Hisayoshi
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ORGANIC compounds ,PHYLLOSILICATES ,TOMOGRAPHY ,CARBONATES ,SILICATES - Abstract
We report μm‐scale nondestructive infrared (IR) hyperspectral results (IR computed tomography, IR‐CT) in 3‐D and IR surface imaging, IR‐S) in 2‐D, at SOLEIL) combined with X‐ray nano‐computed tomography analyses (at SPring‐8) performed on eight small Ryugu fragments extracted from mm‐sized grains coming both from touchdown first and second sites. We describe the multiscale assembly of phyllosilicates, carbonates, sulfides, oxides, and organics. Two types of silicates, as well as diverse kinds of organic matter, were detected inside Ryugu material. Their spatial correlations are described to discuss the role of the mineralogical microenvironments in the formation/evolution of organic matter. In particular, we have shown that there is a redistribution of the organic matter diffuse component during aqueous alteration on the parent body, with a preferential circulation among fine‐grained phyllosilicates. [ABSTRACT FROM AUTHOR]
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- 2024
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15. Development of preparation methods of polished sections of returned samples from asteroid Ryugu by the Hayabusa2 spacecraft.
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Nakashima, Daisuke, Fujioka, Yuri, Katayama, Kanchi, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, and Nakamura, Tomoki
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CARBON-based materials ,SCANNING electron microscopes ,SAMPLING (Process) ,SHEARING force ,EPOXY resins ,ASTEROIDS - Abstract
Preparation procedures of polished sections of the Ryugu samples returned by the Hayabusa2 spacecraft were established through tests using CI and CM chondrites as analog materials of the Ryugu samples and processing of the Ryugu samples. The procedures consisted of four steps: epoxy‐coating, embedding in epoxy cylinders, cutting with a wire saw, and dry polish by hand. There are three key points for successful preparation of the polished sections: (1) ethanol‐mixed epoxy with low viscosity for reinforcing the fragile samples, (2) handling under dry conditions to avoid breakup of the samples on contact with liquids due to their highly porous nature, and (3) X‐ray computed tomography data for exposing maximum surface areas of target mineral phases and clasts. These key points may also be important for processing of samples returned from asteroid Bennu and the Martian Moon Phobos, as those samples are likely to be hydrous carbonaceous chondrite‐like materials. The established procedures induce two side effects: zoning of the polished surface of the Ryugu samples in scanning electron microscope images reflecting differences in carbon contents due to permeation of low viscosity epoxy resin into the sample surface and fractures in anhydrous minerals possibly due to shear stress during dry polishing. [ABSTRACT FROM AUTHOR]
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- 2024
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16. Coevolution of phyllosilicate, carbon, sulfide, and apatite in Ryugu's parent body.
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Gainsforth, Zack, Dominguez, Gerardo, Amano, Kana, Matsumoto, Megumi, Fujioka, Yuri, Kagawa, Eiichi, Nakamura, Tomoki, Tachibana, Shogo, Morita, Tomoyo, Kikuiri, Mizuha, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, and Miyazaki, Akiko
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TRANSMISSION electron microscopy ,CARBONATE minerals ,ORGANIC compounds ,PHYLLOSILICATES ,COEVOLUTION - Abstract
We analyzed an asteroid Ryugu sample returned to Earth by JAXA's Hayabusa2 mission using nanoIR, SEM, and TEM microscopy. We identified multiple distinct carbon reservoirs within the phyllosilicate matrix and demonstrate infrared spectral affinities for some of the carbon to insoluble organic matter (IOM). TEM studies of Ryugu samples have allowed us to better understand the interrelationship between the crystallographic orientations of phyllosilicates and the secondary minerals such as carbonate, sulfide, and apatite. Transport of elements provides a unifying theme for understanding these interrelationships. [ABSTRACT FROM AUTHOR]
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- 2024
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17. The iron oxidation state of Ryugu samples.
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Roskosz, Mathieu, Beck, Pierre, Viennet, Jean‐Christophe, Nakamura, Tomoki, Lavina, Barbara, Hu, Michael Y., Zhao, Jiyong, Alp, Esen E., Takahashi, Yoshio, Morita, Tomoyo, Amano, Kana, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, and Nishimura, Masahiro
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MAGHEMITE ,CLAY minerals ,METEORITES ,MOSSBAUER spectroscopy ,MOSSBAUER effect ,ASTEROIDS - Abstract
The Hayabusa2 mission sampled Ryugu, an asteroid that did not suffer extensive thermal metamorphism, and returned rocks to the Earth with no significant air exposure. It therefore offers a unique opportunity to study the redox state of carbonaceous Cb‐type asteroids and evaluate the overall redox state of the most primitive rocks of the solar system. An analytical framework was developed to investigate the iron mineralogy and valence state in extraterrestrial material at the micron scale by combining x‐ray diffraction, conventional Mössbauer (MS), and nuclear forward scattering (NFS) spectroscopies. An array of standard minerals was analyzed and cross‐calibrated between MS and NFS. Then, MS and NFS spectra on three Ryugu grains were collected at the bulk and the micron scales. In Ryugu samples, iron is essentially accommodated in magnetite, clay minerals (serpentine–smectite), and sulfides. Only a single set of Mössbauer parameters was necessary to account for the entire variability observed in MS and NFS spectra, at all spatial scales investigated. These parameters therefore make up a fully consistent iron mineralogical model for the Ryugu samples. As far as MS and NFS spectroscopies are concerned, Ryugu grains are overall similar to each other and share most of their mineralogical features with CI‐type chondrites. In detail however, no ferrihydrite is found in Ryugu particles even at the very sensitive scale of Mössbauer spectroscopy. The typical Fe3+/Fetot of clay minerals is much lower than typical redox ratios measured in CI chondrites (Fe3+/Fetot = 85%–90%). Furthermore, magnetite from Ryugu is stoichiometric with no significant maghemite component, whereas up to 12% of maghemite was previously identified in the Orgueil's so‐called magnetite. These differences suggest that most CI meteorites suffered terrestrial alteration and that the preterrestrial composition of these carbon‐rich samples was less oxidized than previously measured. However, it is not clear yet whether or not the parent bodies of CI chondrites were as reduced as Ryugu. Finally, the high spatial resolution of NFS allows to disentangle the redox state and the crystal chemistry of iron accommodated in serpentine and smectite. The most likely polytype of serpentine is lizardite, containing <35% of Fe3+, a fraction of which being tetrahedrally coordinated. Smectite is more oxidized (Fe3+/Fetot > 65%) and mainly contains octahedral ferric iron. This finding implies that these clays formed from highly alkaline fluids and the spatial variability highlighted here may suggest a temporal evolution or a spatial variability of the nature of this fluid. [ABSTRACT FROM AUTHOR]
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- 2024
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18. Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples.
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Quirico, Eric, Bonal, Lydie, Kebukawa, Yoko, Amano, Kana, Yabuta, Hikaru, Phan, Van T. H., Beck, Pierre, Rémusat, Laurent, Dartois, Emmanuel, Engrand, Cecile, Martins, Zita, Bejach, Laure, Dazzi, Alexandre, Deniset‐Besseau, Ariane, Duprat, Jean, Mathurin, Jérémie, Montagnac, Gilles, Barosch, Jens, Cody, George D., and De Gregorio, Bradley
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HYDROTHERMAL alteration ,CHONDRITES ,FOURIER transforms ,FUNCTIONAL analysis ,FUNCTIONAL groups - Abstract
We report a Fourier transform infrared analysis of functional groups in insoluble organic matter (IOM) extracted from a series of 100–500 μm Ryugu grains collected during the two touchdowns of February 22 and July 11, 2019. IOM extracted from most of the samples is very similar to IOM in primitive CI, CM, and CR chondrites, and shows that the extent of thermal metamorphism in Ryugu regolith was, at best, very limited. One sample displays chemical signatures consistent with a very mild heating, likely due to asteroidal collision impacts. We also report a lower carbonyl abundance in Ryugu IOM samples compared to primitive chondrites, which could reflect the accretion of a less oxygenated precursor by Ryugu. The possible effects of hydrothermal alteration and terrestrial weathering are also discussed. Last, no firm conclusions could be drawn on the origin of the soluble outlier phases, observed along with IOM in this study and in the preliminary analysis of Ryugu samples. However, it is clear that the HF/HCl residues presented in this publication are a mix between IOM and the nitrogen‐rich outlier phase. [ABSTRACT FROM AUTHOR]
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- 2024
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19. Reassigning CI chondrite parent bodies based on reflectance spectroscopy of samples from carbonaceous asteroid Ryugu and meteorites
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Amano, Kana, primary, Matsuoka, Moe, additional, Nakamura, Tomoki, additional, Kagawa, Eiichi, additional, Fujioka, Yuri, additional, Potin, Sandra M., additional, Hiroi, Takahiro, additional, Tatsumi, Eri, additional, Milliken, Ralph E., additional, Quirico, Eric, additional, Beck, Pierre, additional, Brunetto, Rosario, additional, Uesugi, Masayuki, additional, Takahashi, Yoshio, additional, Kawai, Takahiro, additional, Yamashita, Shohei, additional, Enokido, Yuma, additional, Wada, Taiga, additional, Furukawa, Yoshihiro, additional, Zolensky, Michael E., additional, Takir, Driss, additional, Domingue, Deborah L., additional, Jaramillo-Correa, Camilo, additional, Vilas, Faith, additional, Hendrix, Amanda R., additional, Kikuiri, Mizuha, additional, Morita, Tomoyo, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Yada, Toru, additional, Nishimura, Masahiro, additional, Nakato, Aiko, additional, Miyazaki, Akiko, additional, Yogata, Kasumi, additional, Abe, Masanao, additional, Okada, Tatsuaki, additional, Usui, Tomohiro, additional, Yoshikawa, Makoto, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Nakazawa, Satoru, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional
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- 2023
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20. The iron oxidation state of Ryugu samples
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Roskosz, Mathieu, primary, Beck, Pierre, additional, Viennet, Jean‐Christophe, additional, Nakamura, Tomoki, additional, Lavina, Barbara, additional, Hu, Michael Y., additional, Zhao, Jiyong, additional, Alp, Esen E., additional, Takahashi, Yoshio, additional, Morita, Tomoyo, additional, Amano, Kana, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Yada, Toru, additional, Nishimura, Masahiro, additional, Nakato, Aiko, additional, Miyazaki, Akiko, additional, Yogata, Kasumi, additional, Abe, Masanao, additional, Okada, Tatsuaki, additional, Usui, Tomohiro, additional, Yoshikawa, Makoto, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Nakazawa, Satoru, additional, Watanabe, Sei‐Ichiro, additional, and Tsuda, Yuichi, additional
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- 2023
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21. Compositional heterogeneity of insoluble organic matter extracted from asteroid Ryugu samples
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Quirico, Eric, primary, Bonal, Lydie, additional, Kebukawa, Yoko, additional, Amano, Kana, additional, Yabuta, Hikaru, additional, Phan, Van T. H., additional, Beck, Pierre, additional, Rémusat, Laurent, additional, Dartois, Emmanuel, additional, Engrand, Cecile, additional, Martins, Zita, additional, Bejach, Laure, additional, Dazzi, Alexandre, additional, Deniset‐Besseau, Ariane, additional, Duprat, Jean, additional, Mathurin, Jérémie, additional, Montagnac, Gilles, additional, Barosch, Jens, additional, Cody, George D., additional, De Gregorio, Bradley, additional, Enokido, Yuma, additional, Hashiguchi, Minako, additional, Kamide, Kanami, additional, Kilcoyne, David, additional, Komatsu, Mutsumi, additional, Matsumoto, Megumi, additional, Mostefaoui, Smail, additional, Nittler, Larry, additional, Ohigashi, Takuji, additional, Okumura, Taiga, additional, Sandford, Scott, additional, Shigenaka, Miho, additional, Stroud, Rhonda, additional, Suga, Hiroki, additional, Takahashi, Yoshio, additional, Takeichi, Yasuo, additional, Tamenori, Yusuke, additional, Verdier‐Paoletti, Maximilien, additional, Wakabayashi, Daisuke, additional, Yamashita, Shohei, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yurimoto, Hisayoshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Watanabe, Sei‐Ichiro, additional, Tsuda, Yuichi, additional, Yada, Toru, additional, Nishimura, Masahiro, additional, Nakato, Aiko, additional, Miyazaki, Akiko, additional, Yogata, Kasumi, additional, Abe, Masanao, additional, Okada, Tatsuaki, additional, Usui, Tomohitro, additional, Yoshikawa, Makoto, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, and Nakazawa, Satoru, additional
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- 2023
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22. Reassigning CI chondrite parent bodies based on reflectance spectroscopy of samples from carbonaceous asteroid Ryugu and meteorites
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Amano, Kana (author), Matsuoka, Moe (author), Nakamura, Tomoki (author), Kagawa, Eiichi (author), Fujioka, Yuri (author), Dr Potin, S.J.M. (author), Hiroi, Takahiro (author), Tatsumi, Eri (author), Milliken, Ralph E. (author), Amano, Kana (author), Matsuoka, Moe (author), Nakamura, Tomoki (author), Kagawa, Eiichi (author), Fujioka, Yuri (author), Dr Potin, S.J.M. (author), Hiroi, Takahiro (author), Tatsumi, Eri (author), and Milliken, Ralph E. (author)
- Abstract
The carbonaceous asteroid Ryugu has been explored by the Hayabusa2 spacecraft to elucidate the actual nature of hydrous asteroids. Laboratory analyses revealed that the samples from Ryugu are comparable to unheated CI carbonaceous chondrites; however, reflectance spectra of Ryugu samples and CIs do not coincide. Here, we demonstrate that Ryugu sample spectra are reproduced by heating Orgueil CI chondrite at 300°C under reducing conditions, which caused dehydration of terrestrial weathering products and reduction of iron in phyllosilicates. Terrestrial weathering of CIs accounts for the spectral differences between Ryugu sample and CIs, which is more severe than space weathering that likely explains those between asteroid Ryugu and the collected samples. Previous assignments of CI chondrite parent bodies, i.e., chemically most primitive objects in the solar system, are based on the spectra of CI chondrites. This study indicates that actual spectra of CI parent bodies are much darker and flatter at ultraviolet to visible wavelengths than the spectra of CI chondrites., Spaceborne Instrumentation
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- 2023
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23. Chemical composition of carbonaceous asteroid Ryugu from synchrotron spectroscopy in the mid- to far-infrared of Hayabusa2-returned samples
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Dartois, Emmanuel, primary, Kebukawa, Yoko, additional, Yabuta, Hikaru, additional, Mathurin, Jérémie, additional, Engrand, Cécile, additional, Duprat, Jean, additional, Bejach, Laure, additional, Dazzi, Alexandre, additional, Deniset-Besseau, Ariane, additional, Bonal, Lydie, additional, Quirico, Eric, additional, Sandt, Christophe, additional, Borondics, Ferenc, additional, Barosch, Jens, additional, Cody, George D., additional, De Gregorio, Brad T., additional, Hashiguchi, Minako, additional, Kilcoyne, David A. L., additional, Komatsu, Mutsumi, additional, Martins, Zita, additional, Matsumoto, Megumi, additional, Montagnac, Gilles, additional, Mostefaoui, Smail, additional, Nittler, Larry R., additional, Ohigashi, Takuji, additional, Okumura, Taiga, additional, Remusat, Laurent, additional, Sandford, Scott, additional, Shigenaka, Miho, additional, Stroud, Rhonda, additional, Suga, Hiroki, additional, Takahashi, Yoshio, additional, Takeichi, Yasuo, additional, Tamenori, Yusuke, additional, Verdier-Paoletti, Maximilien, additional, Yamashita, Shohei, additional, Nakamura, Tomoki, additional, Morita, Tomoyo, additional, Kikuiri, Mizuha, additional, Amano, Kana, additional, Kagawa, Eiichi, additional, Noguchi, Takaaki, additional, Naraoka, Hiroshi, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Yurimoto, Hisayoshi, additional, Abe, Masanao, additional, Kamide, Kanami, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nakazawa, Satoru, additional, Nishimura, Masahiro, additional, Okada, Tatsuaki, additional, Saiki, Takanao, additional, Tachibana, Shogo, additional, Tanaka, Satoshi, additional, Terui, Fuyuto, additional, Tsuda, Yuichi, additional, Usui, Tomohiro, additional, Watanabe, Sei-ichiro, additional, Yada, Toru, additional, Yogata, Kasumi, additional, and Yoshikawa, Makoto, additional
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- 2023
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24. Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method
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Ishizaki, Takuya, primary, Nagano, Hosei, additional, Tanaka, Satoshi, additional, Sakatani, Naoya, additional, Nakamura, Tomoki, additional, Okada, Tatsuaki, additional, Fujita, Ryohei, additional, Alasli, Abdulkareem, additional, Morita, Tomoyo, additional, Kikuiri, Mizuha, additional, Amano, Kana, additional, Kagawa, Eiichi, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional
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- 2022
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25. Chondrule-like objects and CAIs in asteroid Ryugu: earlier generations of chondrules
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Nakashima, Daisuke, primary, Nakamura, Tomoki, additional, Zhang, Mingming, additional, Kita, Noriko, additional, Mikouchi, Takashi, additional, Yoshida, Hideto, additional, Enokido, Yuma, additional, Morita, Tomoyo, additional, Kikuiri, Mizuha, additional, Amano, Kana, additional, Kagawa, Eiichi, additional, Yada, Toru, additional, Nishimura, Masahiro, additional, Nakato, Aiko, additional, Miyazaki, Akiko, additional, Yogata, Kasumi, additional, Abe, Masanao, additional, Okada, Tatsuaki, additional, Usui, Tomohiro, additional, Yoshikawa, Makoto, additional, Saiki, Takanao, additional, Tanaka, Satoshi, additional, Nakazawa, Satoru, additional, Terui, Fuyuto, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Okazaki, Ryuji, additional, Sakamoto, Kanako, additional, Watanabe, Sei-ichiro, additional, Tachibana, Shogo, additional, and Tsuda, Yuichi, additional
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- 2022
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26. Small grains from Ryugu: handling and analysis pipeline for Infrared Synchrotron Microspectroscopy
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Rubino, Stefano, primary, Dionnet, Zélia, additional, Aléon-Toppani, Alice, additional, Brunetto, Rosario, additional, Nakamura, Tomoki, additional, Baklouti, Donia, additional, Djouadi, Zahia, additional, Lantz, Cateline, additional, Mivumbi, Obadias, additional, Borondics, Ferenc, additional, Lefrançois, Stephane, additional, Sandt, Christophe, additional, Capitani, Francesco, additional, Héripré, Eva, additional, Troadec, David, additional, Matsumoto, Megumi, additional, Amano, Kana, additional, Morita, Tomoyo, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Watanabe, Seiichiro, additional, and Tsuda, Yuichi, additional
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- 2022
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27. Magnetic Domain Structure of Magnetite Particles in the Return Sample from Asteroid Ryugu by the Hayabusa2 Mission
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Kimura, Yuki, primary, Kato, Takeharu, additional, Anada, Satoshi, additional, Yoshida, Ryuji, additional, Yamamoto, Kazuo, additional, Tanigaki, Toshiaki, additional, Akashi, Tetsuya, additional, Kasai, Hiroto, additional, Nakamura, Tomoki, additional, Sato, Masahiko, additional, Morita, Tomoyo, additional, Kikuiri, Mizuha, additional, Amano, Kana, additional, Kagawa, Eiichi, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Watanabe, Sei-ichiro, additional, Tsuda, Yuichi, additional, and Tachibana, Shogo, additional
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- 2022
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28. Additional file 1 of Rare earth element identification and quantification in millimetre-sized Ryugu rock fragments from the Hayabusa2 space mission
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Tack, Pieter, De Pauw, Ella, Tkalcec, Beverley, Lindner, Miles, Bazi, Benjamin, Vekemans, Bart, Brenker, Frank, Di Michiel, Marco, Uesugi, Masayuki, Yurimoto, Hisayoshi, Nakamura, Tomoki, Amano, Kana, Matsumoto, Megumi, Fujioka, Yuri, Enokido, Yuma, Nakashima, Daisuke, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Watanabe, Sei-Ichiro, Tsuda, Yuichi, and Vincze, Laszlo
- Abstract
Additional file1: Figure S1 XRF spectra corresponding to the measurements in points 1 to 4 in rock fragment C0076 (600 s/pt). XRF spectra were normalised for the Ta–Kα signal intensity to provide more straightforward comparison. Magnified inserts of two select energy ranges marked by dashed bounding boxes in light blue and red are displayed in parts B and C, respectively. Figure S2 CT slices that were obtained at SPring-8 beamline 20X (Nakamura et al. 2022b) show the positions of the points of interest indicated in Figure A1 in Ryugu rock fragment C0076. A red arrow marks the primary X-ray beam path and direction, fluorescence detector was positioned at the left of the CT image. Yellow circles indicate the Ca-rich grains (point 1) from which REE information is primarily obtained. Points 2–4 are matrix measurements and as such have no distinct Ca-rich grains. Separate grains along the beam path are indicated by their respective size along the beam path in orange, along with an estimate of the mineralogical phase for the larger grains.
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- 2022
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29. Large Scale NanoIR Mapping of Ryugu Samples: First Results and Implications for Ryugu’s Formation
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Dominguez, Gerardo, primary, Gainsforth, Zack, additional, Amano, Kana, additional, Nakamura, Tomoki, additional, Matsumoto, Megumi, additional, Fujioka, Yuri, additional, Kagawa, Eiichi, additional, Morita, Tomoyo, additional, Kikuiri, Mizuha, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional
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- 2022
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30. Elastic and thermodynamic properties of asteroid Ryugu return samples
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Hu, Michael, primary, Lavina, Barbara, additional, Alp, Ercan, additional, Zhao, Jiyong, additional, Roskosz, Mathieu, additional, Beck, Pierre, additional, Viennet, Jean-Christophe, additional, Nakamura, Tomoki, additional, Amano, Kana, additional, Kikuiri, Mizuha, additional, Morita, Tomoyo, additional, Yurimoto, Hisayoshi, additional, Noguchi, Takaaki, additional, Okazaki, Ryuji, additional, Yabuta, Hikaru, additional, Naraoka, Hiroshi, additional, Sakamoto, Kanako, additional, Tachibana, Shogo, additional, Watanabe, Sei-ichiro, additional, and Tsuda, Yuichi, additional
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- 2022
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31. Anaerobic Microscopic Analysis of Ferrous Saponite and Its Sensitivity to Oxidation by Earth’s Air: Lessons Learned for Analysis of Returned Samples from Mars and Carbonaceous Asteroids
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Noda, Natsumi, primary, Yamashita, Shohei, additional, Takahashi, Yoshio, additional, Matsumoto, Megumi, additional, Enokido, Yuma, additional, Amano, Kana, additional, Kawai, Takahiro, additional, Sakuma, Hiroshi, additional, Fukushi, Keisuke, additional, Sekine, Yasuhito, additional, and Nakamura, Tomoki, additional
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- 2021
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32. Hyperspectral imaging of carbonaceous chondrites in view of the Hayabusa2 sample return
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Brunetto, Rosario, primary, Aléon-Toppani, Alice, additional, Dionnet, Zélia, additional, Rubino, Stefano, additional, Arribard, Yann, additional, Baklouti, Donia, additional, Borondics, Ferenc, additional, Djouadi, Zahia, additional, Lantz, Cateline, additional, Matsumoto, Megumi, additional, Matsuoka, Moe, additional, Nakamura, Tomoki, additional, Amano, Kana, additional, Takahashi, Miki, additional, Troadec, David, additional, and Tsuchiyama, Akira, additional
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- 2020
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33. Constraints on the Surface Materials of Ryugu from Spectral and Water Analysis of Experimentally-Heated CI Carbonaceous Chondrite
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Amano, Kana, primary, Nakamura, Tomoki, additional, Usui, Fumihiko, additional, Okumura, Satoshi, additional, and Zolensky, Michael, additional
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- 2020
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34. Methylene‐to‐methyl ratio variability in Ryugu samples: Clues to a heterogeneous aqueous alteration.
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Dionnet, Zélia, Djouadi, Zahia, Delaye, Lukas, Caron, Lucas, Brunetto, Rosario, Aléon‐Toppani, Alice, Lantz, Cateline, Rubino, Stefano, Baklouti, Donia, Nakamura, Tomoki, Borondics, Ferenc, Sandt, Christophe, Matsumoto, Megumi, Amano, Kana, Morita, Tomoyo, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, and Naraoka, Hiroshi
- Subjects
- *
ALIPHATIC compounds , *FOURIER transforms , *ORGANIC compounds , *HETEROGENEITY , *STRUCTURAL components , *DIAMOND anvil cell - Abstract
Understanding the processes of aqueous alteration within primitive bodies is crucial for unraveling the complex history of early planetesimals. To better identify the signs of this process and its consequences, we have studied the heterogeneity at a micrometric scale of the structure of the aliphatic organic compounds and its relationship to its mineralogical environment. Here, we report an analysis performed on two micrometric grains of Ryugu (C0002‐FC027 and C0002‐FC028). The samples were crushed in a diamond compression cell and analyzed using high‐spatial resolution Fourier Transform InfraRed (FT‐IR) hyperspectral imaging measurements conducted in transmission mode. We showed here the spatial distributions of the main components and the structural heterogeneity of the aliphatic organic matter highlighting a micrometer‐scale variability in the methylene‐to‐methyl ratio. Moreover, we connected this heterogeneity to the one of the phyllosilicate band positions. Our findings indicate that the organic matter within Ryugu's micrometric grains underwent varying degrees of aqueous alteration in distinct microenvironments resulting in an elongation of the length of their aliphatic chains, and/or a reduction in their branching and/or cross‐linking. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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