The influence of chondrules on sub-mm fragment shape distributions in Allende impact experiments
文献类型：期刊论文
| 作者 | Michikami, Tatsuhiro6; Hagermann, Axel5; Tsuchiyama, Akira2,3,4; Otsuka, Yushi6; Nakamura, Michihiko1; Okumura, Satoshi1; Kano, Harumasa8; Matsuno, Junya4; Hasegawa, Sunao7 |
| 刊名 | ICARUS
 |
| 出版日期 | 2024-06-01 |
| 卷号 | 415页码:13 |
| 关键词 | Asteroids Asteroid surfaces Impact phenomena Meteorites Regolith |
| ISSN号 | 0019-1035 |
| DOI | 10.1016/j.icarus.2024.116068 |
| 英文摘要 | The surfaces of sub -kilometer -sized asteroids directly explored by spacecraft, such as Itokawa, Ryugu and Bennu, are covered with blocks and/or regolith particles, whose shapes are considered clues to understanding their formation and evolution on the asteroid 's surface. Ryugu particles returned by the Hayabusa2 mission are likely fragments resulting from impacts because their shapes resemble impact fragments from laboratory experiments. However, there is a lack of laboratory impact experiments examining the shapes of fragments in carbonaceous chondrites, thought to originate from carbonaceous asteroids such as Ryugu and Bennu. The measured sizes of Ryugu particles are in the mm and sub -mm range, similar to the sizes of chondrules. Also, carbonaceous chondrites are generally structurally weaker than the basalts and granites often used in previous laboratory impact experiments. Differences in the strength of the chondrules and matrix might affect the overall strength of the meteorite. In this study, as a first step towards a better understanding of impact fragment shapes in carbonaceous chondrites, we conducted impact experiments on the carbonaceous meteorite Allende (CV3). A spherical alumina projectile with 1.0 mm and a glass projectile with 0.80 mm in diameter were fired into 1 -2 cm -sized Allende targets at nominal impact velocities of 2.0 and 4.0 km/s, respectively. To investigate the correlation between the chondrules (typically sub -mm in size) and the shapes of fine fragments, we measured the shape distributions of sub -mm impact fragments using X-ray microtomography. We observed several impact fracture surfaces along the chondrule boundaries. In addition, these fragments tended to be rounder than fragments from previous impact experiments. However, because the total number of these fragments is relatively small, the fragments were found to have the same overall shape distribution as previous laboratory impact fragments, Itokawa particles and Ryugu particles. This may imply that impact fragment shapes are independent of the bulk material strength. These findings will be useful for understanding the formation process of regolith layers on asteroid surfaces, Itokawa particles, Ryugu particles, and Bennu particles. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001230185700001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78585]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Michikami, Tatsuhiro; Hagermann, Axel |
| 作者单位 | 1.Tohoku Univ, Grad Sch Sci, Dept Earth Sci, Aoba 6-3,Aramaki,Aoba Ku, Sendai, Miyagi 9808578, Japan 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, 511 Kehua St, Guangzhou 510640, Wushan, Peoples R China 4.Ritsumeikan Univ, Res Org Sci & Technol, 1-1-1 Nojihigashi, Kusatsu, Shiga 5258577, Japan 5.Lulea Univ Technol, Space Campus Kiruna, Lulea, Sweden 6.Kindai Univ, Fac Engn, Hiroshima Campus,1 Takaya Umenobe, Higashihiroshima, Hiroshima 7392116, Japan 7.Inst Space & Astronaut Sci, Japan Aerosp Explorat Agcy, Sagamihara, Kanagawa 2298510, Japan 8.Tohoku Univ, Tohoku Univ Museum, Aoba 6-3,Aramaki,Aoba Ku, Sendai, Miyagi 9808578, Japan |
| 推荐引用方式 GB/T 7714 | Michikami, Tatsuhiro,Hagermann, Axel,Tsuchiyama, Akira,et al. The influence of chondrules on sub-mm fragment shape distributions in Allende impact experiments[J]. ICARUS,2024,415:13. |
| APA | Michikami, Tatsuhiro.,Hagermann, Axel.,Tsuchiyama, Akira.,Otsuka, Yushi.,Nakamura, Michihiko.,...&Hasegawa, Sunao.(2024).The influence of chondrules on sub-mm fragment shape distributions in Allende impact experiments.ICARUS,415,13. |
| MLA | Michikami, Tatsuhiro,et al."The influence of chondrules on sub-mm fragment shape distributions in Allende impact experiments".ICARUS 415(2024):13. |
入库方式： OAI收割
来源：广州地球化学研究所
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