Fei Su, Xuhang Zhang, Youjuan Li, Brian R. Jicha, Katherin H. Joy, Qiuli Li, Yi Chen, Shuhui Cai, Runchuan Liu, Qin Zhou, Saihong Yang, Xianhua Li, Liekun Yang, Wen Chen, Junjie Li, Wanfeng Zhang, Huaning Qiu, Huaiyu He
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引用次数: 0
摘要
嫦娥五号的着陆点为了解月球在~ 2 Ga的埃拉托色尼火山活动晚期提供了一个重要的窗口。利用放射性同位素测年阐明月球火山活动的历史有助于研究月球表面的演变以及月球的内部动力学。最近对嫦娥五号玄武岩的年代学研究得出的年龄跨度为~ 100 Ma，从而抑制了对返回样品中记录的火山活动持续时间的解释。利用微计算机断层扫描和后向散射电子成像技术对9个嫦娥五号玄武岩碎屑进行了结构和形态表征。一些玄武岩碎屑缺乏冲击特征，被解释为没有受到明显的热扰动。40Ar/39Ar的增量加热为四个分段样品提供了明确的平台，加权平均年龄为2021±17 Ma （2σ）。这些是迄今为止用40Ar/39Ar法测定年代的最年轻的海玄武岩之一，当与大多数已公布的嫦娥5号玄武岩Pb-Pb年龄相结合时，确定了在~ 2021 Ma的单一海火山活动。
Constraining 2.0 Ga Volcanism on the Moon via 40Ar/39Ar Dating of Chang'e-5 Basalts
The Chang'e-5 landing site provides an important window into the Moon's late Eratosthenian period of volcanism at ∼2 Ga. Clarifying the Moon's history of volcanic activity using radioisotopic dating assists investigations of the evolution of the lunar surface as well as the Moon's internal dynamics. Recent chronological investigations of Chang'e-5 basalts produced ages spanning ∼100 Ma, thereby inhibiting interpretation of the duration of volcanism recorded in the returned samples. We used microcomputed tomography and Back-Scatter Electron imaging to characterize the structure and morphology of nine Chang'e-5 basalt clasts. Several basalt clasts lack shock features and are interpreted to have not been significantly thermally disturbed. 40Ar/39Ar incremental heating produced well defined plateaus for four sub-split samples that give a weighted mean age of 2,021 ± 17 Ma (2σ). These are among the youngest mare basalts to be dated thus far by the 40Ar/39Ar method and, when combined with most of the published Pb-Pb ages for Chang'e-5 basalts, define a single episode of mare volcanism at ∼2,021 Ma.
期刊介绍：
The Journal of Geophysical Research Planets is dedicated to the publication of new and original research in the broad field of planetary science. Manuscripts concerning planetary geology, geophysics, geochemistry, atmospheres, and dynamics are appropriate for the journal when they increase knowledge about the processes that affect Solar System objects. Manuscripts concerning other planetary systems, exoplanets or Earth are welcome when presented in a comparative planetology perspective. Studies in the field of astrobiology will be considered when they have immediate consequences for the interpretation of planetary data. JGR: Planets does not publish manuscripts that deal with future missions and instrumentation, nor those that are primarily of an engineering interest. Instrument, calibration or data processing papers may be appropriate for the journal, but only when accompanied by scientific analysis and interpretation that increases understanding of the studied object. A manuscript that describes a new method or technique would be acceptable for JGR: Planets if it contained new and relevant scientific results obtained using the method. Review articles are generally not appropriate for JGR: Planets, but they may be considered if they form an integral part of a special issue.
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