A newly revised estimation of bulk densities and examination of the shape of individual Ryugu grains
文献类型：期刊论文
| 作者 | Miyazaki, Akiko5; Yada, Toru5; Yogata, Kasumi5; Hatakeda, Kentaro5,6; Nakato, Aiko4,5; Nishimura, Masahiro5; Nagashima, Kana5; Kumagai, Kazuya5,6; Hitomi, Yuya5,6; Soejima, Hiromichi5,6 |
| 刊名 | EARTH PLANETS AND SPACE
 |
| 出版日期 | 2023-11-15 |
| 卷号 | 75期号:1页码:18 |
| 关键词 | Hayabusa2 Curation Ryugu grains Bulk density 3D shapes |
| DOI | 10.1186/s40623-023-01904-6 |
| 英文摘要 | The bulk density of grains from a celestial body is a fundamental property related to its composition and structure, contributing to the understanding of its evolutionary history. In this study, we provide the bulk density of 637 grains returned from the C-type near-Earth asteroid 162173 Ryugu. This is the largest number of grains to date for the curation activity, corresponding to 38 wt.% of the total returned samples (approximately 5.4 g). Although several densities of the Ryugu grains were reported, the volume estimation of some samples showed uncertainties. Therefore, we applied a new volume estimation model calibrated by X-ray micro-computed tomography (XCT) to the Ryugu grains to more accurately estimate their bulk density. The obtained average bulk density of 637 Ryugu grains was 1.79 +/- 0.31 g/cm3 (1 sigma variation) for weights of 0.5-100 mg (sub-mm -to 10 mm) irrespective of their 3D shapes characterized by three axial length ratios, considered to be a representative of the returned samples. The bulk density distributions of the grains in Chambers A and C were statistically distinguishable, with mean values of 1.81 +/- 0.30 and 1.76 +/- 0.33 g/cm3 (1 sigma variations), respectively. Despite the small difference, bulk density may have differed by sampling site. The obtained average bulk density value of A + C samples was almost the same as that of 16 Ryugu grains estimated based on CT scanned data, and was consistent with the densities of CI chondrites (1.57-1.91 g/cm3). The axial ratios of the grains in Chambers A and C were similar and those of the 724 returned samples and the flying particles ejected during the sampling operations were also similar, suggesting that relatively small Ryugu materials (mm-cm in size) are similar in shape. The minor difference between the Rygu grains and flying particles could be attributed to events such as scraping during sampling operations and transportation. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001102260700001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/78975]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Miyazaki, Akiko |
| 作者单位 | 1.Grad Univ Adv Studies SOKENDAI, Hayama 2400193, Japan 2.Kindai Univ, Fac Engn, Higashihiroshima 7392116, Japan 3.Univ Tokyo, Bunkyo, Tokyo 1130033, Japan 4.Natl Inst Polar Res NIPR, Tachikawa, Tokyo 1908581, Japan 5.Japan Aerosp Explorat Agcy JAXA, Inst Space & Astronaut Sci ISAS, Sagamihara, Kanagawa 2525210, Japan 6.Marine Works Japan Ltd, Yokosuka 2370063, Japan 7.Ritsumeikan Univ, Kusatsu 5258577, Japan 8.Chinese Acad Sci, Guangzhou Inst Geochem, CAS Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 9.CAS Ctr Excellence Deep Earth Sci, Guangzhou 51640, Peoples R China 10.Univ Tokyo, Dept Earth & Planetary Sci, Bunkyo Ku, Tokyo 1130033, Japan |
| 推荐引用方式 GB/T 7714 | Miyazaki, Akiko,Yada, Toru,Yogata, Kasumi,et al. A newly revised estimation of bulk densities and examination of the shape of individual Ryugu grains[J]. EARTH PLANETS AND SPACE,2023,75(1):18. |
| APA | Miyazaki, Akiko.,Yada, Toru.,Yogata, Kasumi.,Hatakeda, Kentaro.,Nakato, Aiko.,...&Usui, Tomohiro.(2023).A newly revised estimation of bulk densities and examination of the shape of individual Ryugu grains.EARTH PLANETS AND SPACE,75(1),18. |
| MLA | Miyazaki, Akiko,et al."A newly revised estimation of bulk densities and examination of the shape of individual Ryugu grains".EARTH PLANETS AND SPACE 75.1(2023):18. |
入库方式： OAI收割
来源：广州地球化学研究所
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