Multiple Impact Sources for Light Plains Around the Lunar South Pole

IF 3.9 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Journal of Geophysical Research: Planets Pub Date : 2024-11-01 DOI:10.1029/2024JE008605

Barbara Giuri, Carolyn H. van der Bogert, Mark S. Robinson, Harald Hiesinger

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Abstract

We investigated the age and origin of 41 light plain deposits around the lunar south pole, using LRO data sets and successfully dated 22 of them using crater size-frequency distribution measurements. We find that deposits related to Schrödinger basin are ∼3.8 Ga old, including deposits on the Amundsen crater floor, which we interpret as Schrödinger basin ejecta. Six study areas date to ∼3.7 Ga, which reflect an additional large-scale or basin impact event post-Schrödinger - possibly Orientale. An additional two areas with younger isolated ages likely represent local impact sources. Finally, smooth, light plains-like, ejecta deposits around Shackleton crater were found to be Eratosthenian in age. Our findings show that light plain deposits originate from a combination of both basin and local ejecta materials. Thus, samples collected in the region will exhibit a diverse range of basin materials and ages representative of the ejecta from multiple impact events.

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月球南极周围光原的多重撞击源

我们利用 LRO 数据集研究了月球南极周围 41 个轻质平原沉积物的年龄和起源，并利用陨石坑大小-频率分布测量法成功测定了其中 22 个沉积物的年代。我们发现，与薛定谔盆地有关的沉积物的年龄在3.8千兆年前，包括阿蒙森陨石坑底部的沉积物，我们将其解释为薛定谔盆地喷出物。六个研究区域的年代为 3.7 Ga ∼，反映了薛定谔事件之后的另一次大规模或盆地撞击事件--可能是东方撞击事件。另外两个区域的独立年龄较小，可能是当地的撞击源。最后，在沙克尔顿陨石坑周围发现了光滑的、类似轻质平原的喷出沉积物，其年龄为厄拉托申纪。我们的研究结果表明，轻质平原沉积物源于盆地和当地喷出物质的结合。因此，在该地区采集的样本将显示出多种多样的盆地材料和代表多次撞击事件喷出物的年龄。

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来源期刊

Journal of Geophysical Research: Planets Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

8.00

自引率

27.10%

发文量

254

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.