Impact remnants rich in carbonaceous chondrites detected on the Moon by the Chang’e-4 rover
Impact remnants rich in carbonaceous chondrites detected on the Moon by the Chang’e-4 rover
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DOI：
10.1038/s41550-021-01530-w
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发表时间：
2021-11
期刊：
影响因子：
14.1
通讯作者：
Yazhou Yang;Shuai Li;Meng‐Hua Zhu;Yang Liu;Bo Wu;Jun Du;W. Fa;R. Xu;Zhiping He;Chi Wang;B. Xue;Jianfeng Yang;Yongliao Zou
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文献类型：
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作者：
Yazhou Yang;Shuai Li;Meng‐Hua Zhu;Yang Liu;Bo Wu;Jun Du;W. Fa;R. Xu;Zhiping He;Chi Wang;B. Xue;Jianfeng Yang;Yongliao Zou
月球自形成以来经历了一段激烈的轰击历史。撞击器的碎片可以留在月球表面，并可以提供撞击器组成和地球-月球系统中撞击人口演变的证据。然而，由于随后的撞击园艺，之前在阿波罗样本中发现的保留的撞击碎片已经很好地混合到了大量的月球风化层中，它们的性质不容易分离。在这里，我们报道了嫦娥四号玉兔二号探测器在不到一百万年前观测到的一个两米大小的陨石坑。在可见光和近红外范围(0.45-0.945μm)，空间分辨率低于每像素1 mm的高光谱图像突出了含有高浓度(47%)碳质球粒陨石的玻璃物质的存在。我们确定这种材料是原始冲击器的残留物，没有被撞击完全汽化。虽然在阿波罗样品中发现了碳质球粒陨石碎片，但通过遥感探测，没有在月球表面直接观测到碳质球粒陨石残留物。我们认为，碳质球粒陨石状天体可能仍是目前月球的水源之一。
The Moon has experienced an intense bombardment history since its formation. Fragments of the impactor can remain on the lunar surface, –and can provide evidence of the evolution of the impactor composition and impact population in the Earth–Moon system, –. However, the retained impactor fragments previously identified in the Apollo samples have been well mixed into bulk lunar regolith due to the subsequent impact gardening, and their properties cannot be easily isolated,,. Here we report observations of a two-metre-sized crater that formed less than one million years ago obtained by the Yutu-2 rover of Chang’e-4. Hyperspectral images in the visible and near-infrared range (0.45–0.945 μm) with a spatial resolution less than 1 mm per pixel highlight the presence of glassy material with high concentration (47%) of carbonaceous chondrites. We identify this material as remnants of the original impactor that was not entirely vaporized by the impact. Although carbonaceous chondrite fragments have been found in Apollo samples,, no carbonaceous chondrite remnant had been directly observed on the lunar surface by remote sensing exploration. We suggest that carbonaceous chondrite-like bodies may still provide one of the sources of water to the present Moon.