Discovery of a highly shocked alkali suite clast in the Chang'e-5 lunar soils

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2024-12-21 DOI:10.1016/j.icarus.2024.116448

Mengfan Qiu , Sen Hu , Huicun He , Zongyu Yue , Hejiu Hui , Jialong Hao , Ruiying Li , Sheng Gou , Lixin Gu , Xu Tang , Jinhua Li , Wei Yang , Hengci Tian , Chi Zhang , Di Zhang , Qian Mao , Lihui Jia , Xiaoguang Li , Yi Chen , Shitou Wu , Fuyuan Wu

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引用次数: 0

Abstract

Lunar soils contain various types of components and thus are crucial for unraveling the geological and impact histories of the Moon. Little is known about the amount and source regions of the non-mare components preserved in the Chang'e-5 (CE5) lunar soils. A study of systematic identification and characterization of the non-mare components in the CE5 lunar soils was carried out in this work. A non-mare clast, displaying contrast to mare basalts, was firstly identified in the scooped CE5 lunar soils using nondestructive micro-CT investigating. Further detailed petrographic observations and analyses of mineral chemistry reveal that this non-mare clast is a highlands alkali suite (HAS). This HAS clast is mainly composed of plagioclase (46.5), pigeonite (30.9), K-Si-rich mesostasis (17.0), K-felspar (4.12), and silica (0.87) in area%, with minor ilmenite, merrillite, apatite, baddeleyite, and troilite. This clast contains high-pressure polymorph of silica, seifertite and stishovite, and is characterized by high K₂O (1.88 wt%), and low TiO₂ (0.63 wt%) and low FeO (8.36 wt%) contents. Pb-Pb dating of baddeleyite yields a date of 3913 ± 7 Ma, probably representing a plutonic event or an impact event happened on the Moon. Another ejection event is required to transport the alkali suite to the landing site of the CE5 mission postdated the emplacement of the CE5 mare basalt.

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.