Moon-Based Ground-Penetrating Radar Observation of the Latest Volcanic Activity at the Chang’E-4 Landing Site
Moon-Based Ground-Penetrating Radar Observation of the Latest Volcanic Activity at the Chang’E-4 Landing Site
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DOI：
10.1109/tgrs.2023.3277992
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发表时间：
2023
影响因子：
8.2
通讯作者：
Chunyu Ding;Jing Li;Rong Hu
中科院分区：
文献类型：
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作者：
Chunyu Ding;Jing Li;Rong Hu
嫦娥四号(CE-4)玉兔二号月球车上的月基探地雷达(GPR)部署在月球背面，为研究月球浅表面地质过程和月球火山喷发历史提供了前所未有的机会。高频雷达在月球表面下27米处观测到一个隐伏的透镜结构，以前的研究将其解释为古冰层。在这项研究中，我们对CE-4任务中观测到的掩埋透镜结构的介电特性进行了定量分析。结果表明，该结构的相对介电常数和损耗正切分别为10.5美元和0.037美元。将我们估计的介电性质与阿波罗样品和雷达观测到的熔岩流相比较，表明埋藏的透镜既不是风化也不是喷出物，而可能是玄武岩流。此外，我们推测，埋藏的玄武岩流可能代表了月球上最近一次火山喷发，可能来自大约25-22亿年前发生的埃拉托斯提尼时代的火山。最后，更新了玉兔二号高频雷达在CE-4着陆点观测到的风化层地层结构的解释。
The Moon-based ground-penetrating radar (GPR) onboard the Chang’E-4 (CE-4) Yutu-2 rover has deployed on the Moon’s far side, providing an unprecedented opportunity to study the shallow surface geological process and the history of the volcanic eruption of the Moon. The high-frequency radar observed a buried lens structure $\sim $ 27 m below the lunar surface, interpreted as paleoregolith by previous studies. In this study, we conducted a quantitative analysis of the dielectric properties of the buried lens structure observed during the CE-4 mission. Our results reveal that the relative permittivity and loss tangent of the structure is $\sim $ 10.5 and $\sim $ 0.037, respectively. Comparing our estimated dielectric properties with those of Apollo samples and radar-observed lava flows shows that the buried lens is neither regolith nor ejecta material but possibly basalt flow. In addition, we speculate that the buried basalt flow may represent the latest volcanic eruption on the Moon, possibly from the Eratosthenian-aged volcano that occurred approximately 2.5–2.2 billion years ago. Finally, we update the interpretation of the regolith stratigraphic structure observed by the Yutu-2 high-frequency radar at the CE-4 landing site.