Nonequilibrium spherulitic magnetite in the Ryugu samples
文献类型：期刊论文
| 作者 | Dobrica, Elena; Ishii, Hope A.; Bradley, John P.; Ohtaki, Kenta; Brearley, Adrian J.; Noguchi, Takaaki; Matsumoto, Toru; Miyake, Akira; Igami, Yohei; Haruta, Mitsutaka |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2023 |
| 卷号 | 346页码:65-75 |
| 关键词 | MESSENGER-RNA LOCALIZATION AQUEOUS ALTERATION PROTEIN-SYNTHESIS LOCAL TRANSLATION BINDING-PROTEINS TAGISH LAKE GROWTH MINERALOGY CHONDRITE CI |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2023.02.003 |
| 英文摘要 | We have investigated several particles collected during each of two touchdowns of the Hayabusa2 space-craft at the surface of the C-type asteroid 162173 Ryugu using various electron microscope techniques. Our detailed transmission electron microscopy study shows the presence of magnetite with various mor-phologies coexisting in close proximity. This is characteristic of CI chondrite-like materials and consistent with the mineral assemblages and compositions in the Ryugu parent body. We describe the microstruc-tural characteristics of magnetite with different morphologies, which could have resulted from the chem-ical conditions (growth vs. diffusion rate) during their formation. Furthermore, we describe the presence of magnetites with a spherulitic structure composed of individual radiating fibers that are characterized by pervasive, homogeneously distributed euhedral to subhedral pores that have not been described in previous chondrite studies. This particular spherulitic structure is consistent with crystallization under nonequilibrium conditions. Additionally, the presence of a high density of defects within the magnetite fibers, the high surface/volume ratio of this morphology, and the presence of amorphous materials in sev-eral pores and at the edges of the acicular fibers further support their formation under nonequilibrium conditions. We suggest that the growth processes that lead to this structure result from the solution reaching a supersaturated state, resulting in an adjustment to a lower free energy condition via nucle-ation and rapid growth.(c) 2023 Elsevier Ltd. All rights reserved. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000951237800001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80370]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 推荐引用方式 GB/T 7714 | Dobrica, Elena,Ishii, Hope A.,Bradley, John P.,et al. Nonequilibrium spherulitic magnetite in the Ryugu samples[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2023,346:65-75. |
| APA | Dobrica, Elena.,Ishii, Hope A..,Bradley, John P..,Ohtaki, Kenta.,Brearley, Adrian J..,...&Tsuda, Yuichi.(2023).Nonequilibrium spherulitic magnetite in the Ryugu samples.GEOCHIMICA ET COSMOCHIMICA ACTA,346,65-75. |
| MLA | Dobrica, Elena,et al."Nonequilibrium spherulitic magnetite in the Ryugu samples".GEOCHIMICA ET COSMOCHIMICA ACTA 346(2023):65-75. |
入库方式： OAI收割
来源：广州地球化学研究所
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