Long Tao, Qian Yuqi, Norman Marc D, Miljkovic Katarina, Crow Carolyn, Head James W, Che Xiaochao, Tartèse Romain, Zellner Nicolle, Yu Xuefeng, Xie Shiwen, Whitehouse Martin, Joy Katherine H, Neal Clive R, Snape Joshua F, Zhou Guisheng, Liu Shoujie, Yang Chun, Yang Zhiqing, Wang Chen, Xiao Long, Liu Dunyi, Nemchin Alexander
Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China.
Planetary Science Institute, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
Sci Adv. 2022 Sep 30;8(39):eabq2542. doi: 10.1126/sciadv.abq2542. Epub 2022 Sep 28.
Impact glasses found in lunar soils provide a possible window into the impact history of the inner solar system. However, their use for precise reconstruction of this history is limited by an incomplete understanding of the physical mechanisms responsible for their origin and distribution and possible relationships to local and regional geology. Here, we report U-Pb isotopic dates and chemical compositions of impact glasses from the Chang'e-5 soil and quantitative models of impact melt formation and ejection that account for the compositions of these glasses. The predominantly local provenance indicated by their compositions, which constrains transport distances to <~150 kilometers, and the age-frequency distribution are consistent with formation mainly in impact craters 1 to 5 kilometers in diameter. Based on geological mapping and impact cratering theory, we tentatively identify specific craters on the basaltic unit sampled by Chang'e-5 that may have produced these glasses and compare their ages with the impact record of the asteroid belt.
在月球土壤中发现的撞击玻璃为了解内太阳系的撞击历史提供了一个可能的窗口。然而，由于对导致其形成和分布的物理机制以及与局部和区域地质的可能关系认识不全面，限制了它们用于精确重建这一历史的用途。在这里，我们报告了嫦娥五号土壤中撞击玻璃的铀-铅同位素年龄和化学成分，以及考虑了这些玻璃成分的撞击熔体形成和喷发的定量模型。它们的成分表明主要是本地来源，这将传输距离限制在<~150公里，年龄频率分布与主要在直径1至5公里的撞击坑中形成一致。基于地质测绘和撞击坑理论，我们初步确定了嫦娥五号采样的玄武岩单元上可能产生这些玻璃的特定撞击坑，并将它们的年龄与小行星带的撞击记录进行比较。
