Possible records of space weathering on Vesta: Case study in a brecciated eucrite Northwest Africa 1109 | |
Shu-Zhou WANG; Ai-Cheng ZHANG; Run-Lian PANG; Yang LI; Jia-Ni CHEN | |
刊名 | Meteoritics & Planetary Science |
2019 | |
页码 | 1-14 |
英文摘要 | Records of space weathering are important for understanding the formation and evolution of surface regolith on airless celestial bodies. Current understanding of space weathering processes on asteroids including asteroid-4 Vesta, the source of the howardite– eucrite–diogenite (HED) meteorites, lags behind what is known for the Moon. In this study, we studied agglutinates, a vesicular glass-coating lithic clast, and a fine-grained sulfide replacement texture in the polymict breccia Northwest Africa (NWA) 1109 with electron microscopy. In agglutinates, nanophase grains of FeNi and FeS were observed, whereas npFe0 was absent. We suggested that the agglutinates in NWA 1109 formed from finegrained surface materials of Vesta during meteorite/micrometeorite bombardment. The finegrained sulfide replacement texture (troilite + hedenbergite + silica) should be a result of reaction between S-rich vapors and pyroxferroite. The unique Fe/Mn values of relict pyroxferroite indicate a different source from normal HED pyroxenes, arguing that the reaction took place on or near the surface of Vesta. The fine-grained sulfide replacement texture could be a product of nontypical space weathering on airless celestial bodies. We should pay attention to this texture in future returned samples by asteroid exploration missions. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.gyig.ac.cn/handle/42920512-1/10551] |
专题 | 地球化学研究所_月球与行星科学研究中心 |
作者单位 | 1.Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.Lunar and Planetary Science Institute, Nanjing University, Nanjing 210046, China 3.State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China |
推荐引用方式 GB/T 7714 | Shu-Zhou WANG; Ai-Cheng ZHANG;Run-Lian PANG;Yang LI;Jia-Ni CHEN. Possible records of space weathering on Vesta: Case study in a brecciated eucrite Northwest Africa 1109[J]. Meteoritics & Planetary Science,2019:1-14. |
APA | Shu-Zhou WANG; Ai-Cheng ZHANG;Run-Lian PANG;Yang LI;Jia-Ni CHEN.(2019).Possible records of space weathering on Vesta: Case study in a brecciated eucrite Northwest Africa 1109.Meteoritics & Planetary Science,1-14. |
MLA | Shu-Zhou WANG; Ai-Cheng ZHANG;Run-Lian PANG;Yang LI;Jia-Ni CHEN."Possible records of space weathering on Vesta: Case study in a brecciated eucrite Northwest Africa 1109".Meteoritics & Planetary Science (2019):1-14. |
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