Compositional Variability of 2.0-Ga Lunar Basalts at the Chang'e-5 Landing Site

doi:10.1029/2022JE007627

	Compositional Variability of 2.0-Ga Lunar Basalts at the Chang'e-5 Landing Site
	Boschi, Samuele 1; Wang, Xiao-Lei 1; Hui, Hejiu 2,3; Yin, Zongjun 4; Guan, Yue 1; Hu, Huan 1; Zhang, Wenlan 1; Chen, Jiayang 1; Li, Weiqiang 1,2,3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
	2023-05-01
卷号	128 期号:5 页码:12
关键词	Chang'e-5 lunar basalt SIMS pigeonite compositional variability
ISSN号	2169-9097
DOI	10.1029/2022JE007627
通讯作者	Li, Weiqiang(liweiqiang@nju.edu.cn)
英文摘要	China's Chang'e-5 (CE-5) mission successfully returned a total of 1.731 kg of lunar material from the north-eastern Oceanus Procellarum region. Young (similar to 2.0 Ga) ages were reported from the CE-5 basalts. However, there are controversies on whether they are low-Ti or high-Ti mare basalt type. Here, we report the results of a comprehensive petrographic, elemental, and Pb isotopic investigation on a 17.6 mg CE-5 basalt clast (CE5C0000YJYX048). By combining high-resolution X-ray tomography of the clast and microbeam (scanning electron microscope SEM, electron probe microanalyzer EPMA) analyses of mineral grains peeled off the clast surface, we derived the bulk clast chemical composition with a very small sample consumption (i.e., <3 mg). The poikilitic clast has a bulk TiO2 content of 3.78 +/- 1.01 wt%, which is representative of a low-Ti basalt end-member in the lunar mare basalts samples. Furthermore, the pyroxene in the studied clast is dominantly pigeonite, in contrast to other reported CE-5 samples where augite is the dominant pyroxene mineralogy. Despite these compositional peculiarities, in situ secondary ion mass spectrometer dating yielded a Pb-Pb age of 2,040 +/- 22 Ma for the fragment, which is consistent with ages reported from other CE-5. Based on the chemical and age data analyzed in this study, it can be concluded that the lunar basalts obtained from the CE-5 mission originated from a low-Ti mare basalt-type source. The mineral composition of the mare basalt clast studied, which is dominated by pigeonite, fayalite, and anorthite, likely resulted from late-stage magmatic crystallization when the magma was enriched in Fe.
WOS关键词	MARE BASALTS ; RARE-EARTH ; PETROGENESIS ; MINERALOGY ; DIVERSITY ; CHEMISTRY ; REGOLITH ; MELT
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:001000271300001
内容类型	期刊论文
源URL	[http://ir.nigpas.ac.cn/handle/332004/42132]
专题	中国科学院南京地质古生物研究所
通讯作者	Li, Weiqiang
作者单位	1.Nanjing Univ, Sch Earth Sci & Engn, State Key Lab Mineral Deposits Res, Nanjing, Peoples R China 2.Nanjing Univ, Lunar & Planetary Sci Inst, Sch Earth Sci & Engn, Nanjing, Peoples R China 3.CAS Ctr Excellence Comparat Planetol, Hefei, Peoples R China 4.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Boschi, Samuele,Wang, Xiao-Lei,Hui, Hejiu,et al. Compositional Variability of 2.0-Ga Lunar Basalts at the Chang'e-5 Landing Site[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2023,128(5):12.
APA	Boschi, Samuele.,Wang, Xiao-Lei.,Hui, Hejiu.,Yin, Zongjun.,Guan, Yue.,...&Li, Weiqiang.(2023).Compositional Variability of 2.0-Ga Lunar Basalts at the Chang'e-5 Landing Site.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,128(5),12.
MLA	Boschi, Samuele,et al."Compositional Variability of 2.0-Ga Lunar Basalts at the Chang'e-5 Landing Site".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 128.5(2023):12.