Shulou(Shulou.com)11/24 Report--

CTOnews.com, December 23, according to the website of the Institute of Geochemistry of the Chinese Academy of Sciences, the foreign cuttings in the lunar soil of Chang'e No. 5 can provide restrictive information for understanding the ploughing and migration process of lunar materials, the diversity of lunar crust rock composition, and the geological evolution of lunar crust. By studying the lunar soil samples of Chang'e V, the research team of the Institute of Geochemistry of the Chinese Academy of Sciences obtained the composition of exotic igneous rock debris on the lunar 2.0 Ga young basalt geological unit and found the special rock debris of the lunar crust, indicating that there are still unrecognized geological units on the moon. The work was recently published in the journal Nature Astronomy.

The Chang'e-5 landing area is a medium-titanium basalt unit formed 2 billion years ago, which is younger than the geological units in the sampling area of the Apollo and Luna missions (> 3 billion years). The lunar soil of Chang'e-5 provides a new time window for the study of material transformation and composition in the young geological units of the moon. Due to the long-term impact and transformation of the lunar surface by small celestial bodies, the lunar surface materials are constantly broken, ploughed, migrated and mixed, so that the lunar soil in the Chang'e-5 sampling area contains a certain amount of sputtering from other regions.

▲ Chang'e 5 sampling area contains exotic cuttings of other geological units of the moon. The picture is from the website of the Institute of Geochemistry of the Chinese Academy of Sciences, and the research team of the Institute of Geochemistry of the Chinese Academy of Sciences has analyzed more than 3000 Chang'e 5 lunar soil particles and identified 7 igneous detritus different from the titanium basalts in Chang'e 5, including high titanium glass-based porphyry rock debris and low titanium basalt debris. Olivine pyroxenite detritus, magnesia plagioclase detritus, highly evolved rock detritus, magnesium-rich olivine detritus and volcanic glass detritus.

It is found that the high-titanium glass-based porphyry rock detritus may be lunar olivine basalt detritus, which is different from the reported Apollo olivine basalt, and the magnesia plagioclase fragments not observed in Apollo samples are found, which are mainly reported in plagioclase highland breccia meteorites, indicating that there is also magnesia plagioclase distribution in the front of the moon. In addition, the volcanic glass detritus studied has higher FeO content and lower Mg# value than Apollo volcanic glass, indicating that there is an unknown (more evolved) volcanic eruption on the moon.

A schematic map of the geological background and the genesis of exotic cuttings in the ▲ Chang'e-5 sampling area, the Institute of Geochemistry of the Chinese Academy of Sciences said that the research work obtained information on the composition of exotic igneous rock debris on the lunar 2.0 Ga young basalt unit for the first time, and found special rock debris of the lunar crust, which provides evidence for revealing the diversity of lunar crust composition and magmatic activity. The study indicates that there are still unrecognized geological units on the moon, which can provide scientific support for planning future lunar sampling or remote sensing missions. In addition to exotic igneous debris, the research team has recently discovered new lunar minerals, lunar special impact sputtering, and suspected asteroid debris in Chang'e-5 lunar soil. it will help to revolutionize the understanding of the geological evolution of the moon.

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