中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院地球与行星物理重点实验室
Mass-dependent nickel isotopic variations in achondrites and lunar rocks

文献类型：期刊论文

作者Wang, Shui-Jiong3; Li, Shi-Jie2; Lin, Yangting1; Sheng, Si-Zhang3
刊名GEOCHIMICA ET COSMOCHIMICA ACTA
出版日期2023-06-01
卷号350页码:16-27
ISSN号0016-7037
关键词Nickel isotopes Achondrite Moon Late accretion Giant impact
DOI10.1016/j.gca.2023.04.004
英文摘要We present high-precision mass-dependent nickel isotopic data for a comprehensive suite of achondrites and lunar rocks, providing key insights into the early planetary differentiation and Earth-Moon system formation. The primitive achondrites display high Ni contents and invariant Ni isotopic compositions. Incomplete core-mantle differentiation in primitive achondrite parent bodies resulted in the retention of metal in the mantle, which dominated the Ni budget and accounted for the bulk chondritic Ni isotopic values. The highly reduced differentiated achondrites, aubrites and an ungrouped achondrite (NWA 8409), have variable, and extremely light Ni isotopic compositions. Acid leaching experiments demonstrate that the sulfides are a significant host of light Ni isotopes in aubrites. The most extreme Ni isotope values of aubrites may be due to large Ni isotope fractionation accompanied by silicate-sulfide-metal separation during differentiation of the parent bodies, and subsequent global disruptive collision and reassembly with variably high proportions of sulfides enriched in the mantle. The howardite-eucrite-diogenite (HED) meteorites show Ni isotopic variations that are positively correlated with Ni/Co ratios, a feature that cannot be produced by igneous differentiation. Late accretion of high-Ni and high-Ni/Co chondritic materials after core formation of their likely parent body, Vesta, could have accounted for this correlation. Thus, the primitive silicate mantle of Vesta may have sub-chondritic Ni isotopic compositions, implying possible Ni isotope fractionation during core-mantle differentiation of small planetary bodies. The lunar breccia meteorites have homogenously chondritic Ni isotope values, together with their high Ni/Co of bulk rock and metals therein, suggesting impact contamination. Lunar basalt meteorites have low Ni/Co ratios and are systematically isotopically lighter than the breccias, displaying a positive correlation between Ni isotope value and Ni/Co ratio, as that seen in the HEDs. Therefore, the Ni isotopic systematics in lunar rocks also indicates the effect of late accretion, with the primitive lunar mantle having sub-chondritic Ni isotope values. This implies that the Moon-forming impactor, Theia, was likely an aubrite-like differentiated planetary body whose mantle was enriched in light Ni isotopes. We suggest that there was significant Ni isotope fractionation between core and mantle during differentiation of early formed small planetary bodies, but this signature can be obscured by late accretion in the bulk achondrite records.
WOS关键词HIGHLY SIDEROPHILE ELEMENT ; NORTHWEST AFRICA 7325 ; METAL-SILICATE DIFFERENTIATION ; CORE FORMATION ; PARENT-BODY ; OSMIUM ISOTOPE ; LATE ACCRETION ; SOLAR-SYSTEM ; FRACTIONATION ; ORIGIN
资助项目Na-tional Natural Science Foundation of China[41973010] ; Na-tional Natural Science Foundation of China[42241103] ; National Nature Science Foundation of China[42170346]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000989628500001
资助机构Na-tional Natural Science Foundation of China ; Na-tional Natural Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; Na-tional Natural Science Foundation of China ; Na-tional Natural Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; Na-tional Natural Science Foundation of China ; Na-tional Natural Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; Na-tional Natural Science Foundation of China ; Na-tional Natural Science Foundation of China ; National Nature Science Foundation of China ; National Nature Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/110936]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Wang, Shui-Jiong
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geochem, Ctr Lunar & Planetary Sci, Guiyang, Peoples R China
3.China Univ Geosci Beijing, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Shui-Jiong,Li, Shi-Jie,Lin, Yangting,et al. Mass-dependent nickel isotopic variations in achondrites and lunar rocks[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2023,350:16-27.
APA Wang, Shui-Jiong,Li, Shi-Jie,Lin, Yangting,&Sheng, Si-Zhang.(2023).Mass-dependent nickel isotopic variations in achondrites and lunar rocks.GEOCHIMICA ET COSMOCHIMICA ACTA,350,16-27.
MLA Wang, Shui-Jiong,et al."Mass-dependent nickel isotopic variations in achondrites and lunar rocks".GEOCHIMICA ET COSMOCHIMICA ACTA 350(2023):16-27.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。