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  4. 中国科学院地球与行星物理重点实验室
NanoSIMS and EPMA dating of lunar zirconolite

文献类型：期刊论文

作者Wang, Nian1,2; Mao, Qian3; Zhang, Ting1,2; Hao, Jialong1; Lin, Yangting1
刊名PROGRESS IN EARTH AND PLANETARY SCIENCE
出版日期2021-09-13
卷号8期号:1页码:8
关键词Zirconolite Chemical age Lunar sample NWA 4485 Chang'E-5 Lunar basalt
ISSN号2197-4284
DOI10.1186/s40645-021-00446-3
英文摘要Zirconolite is a common Zr-rich accessary mineral in mafic rocks. It is also an ideal U-Pb/Pb-Pb chronometer because it commonly contains high U content (mostly 0.1-10 wt%) and negligible initial Pb. However, zirconolite is usually very small (e.g., similar to 1 mu m in width) in lunar rocks, requiring a high spatial resolution analysis. We analyzed a single, large (25 mu m x 20 mu m) grain of zirconolite in lunar meteorite NWA 4485 using Pb-Pb dating by NanoSIMS and U-Th-Pb dating by EPMA. The resultant U-Th-Pb age is 4540 +/- 340 Ma (2 sigma) with a spatial resolution of 1.3 mu m. The Pb-Pb age by NanoSIMS is 4348.5 +/- 4.8 Ma (2 sigma) with a spatial resolution of similar to 2 mu m, consistent with the age of 4352 +/- 10 Ma and 4344 +/- 14 Ma reported in the same meteorite and its paired meteorite NWA 4472. Although U-Th-Pb age is somewhat older, it still includes the NanoSIMS results within the analytical uncertainty. This work demonstrates the potential application of the combined EPMA dating and REE analysis of lunar zirconolite, with the benefits of high spatial resolution, non-destructive, and readily accessibility of the instrument. The precision of the EPMA dating (7.6%, 2 sigma) can be improved by increasing the counting time for Pb, U and Th. We expect to apply this EPMA technique for a quick and non-destructive age survey and geochemical study of zirconolite grains from the lunar mare basalts newly returned by Chang'E-5 mission which landed on a very young (1.2-2.0 Ga by crater-counting chronology) basalt unit in Procellarum KREEP Terrain.
WOS关键词U-PB ; LAPAZ-ICEFIELD ; AGE CONSTRAINTS ; TH ; MINERALS ; MONAZITE ; GEOCHRONOLOGY ; GEOCHEMISTRY ; COMPLEX ; PETROGENESIS
资助项目Key Research Program of Frontier Sciences, CAS[QYZDJ-SSW-DQC001]
WOS研究方向Geology
语种英语
WOS记录号WOS:000698149500001
出版者SPRINGER
资助机构Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/102684]  
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
地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Lin, Yangting
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Nian,Mao, Qian,Zhang, Ting,et al. NanoSIMS and EPMA dating of lunar zirconolite[J]. PROGRESS IN EARTH AND PLANETARY SCIENCE,2021,8(1):8.
APA Wang, Nian,Mao, Qian,Zhang, Ting,Hao, Jialong,&Lin, Yangting.(2021).NanoSIMS and EPMA dating of lunar zirconolite.PROGRESS IN EARTH AND PLANETARY SCIENCE,8(1),8.
MLA Wang, Nian,et al."NanoSIMS and EPMA dating of lunar zirconolite".PROGRESS IN EARTH AND PLANETARY SCIENCE 8.1(2021):8.

入库方式： OAI收割

来源：地质与地球物理研究所

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