According to the Institute of Geochemistry of the Chinese Academy of Sciences, recently, Du Wei’s team from the Institute of Geochemistry of the Chinese Academy of Sciences discovered for the first time in the Chang’e-5 lunar soil samples the high-pressure phases of symbiotic silica – sai quartz and Si quartz. This is the first time Sai quartz was found in extraterrestrial return samples.
The surface of the moon is covered with impact craters of various shapes and sizes, indicating that it has suffered frequent impacts during its evolution. Studying the impact history of the moon is not only an important topic of lunar science, but also an important window to spy on the impact history of the earth. Impact is an important geological process for the mixing of materials on the lunar surface, and an important factor controlling the formation and evolution of lunar soil. High-pressure minerals are important recorders of impact events. However, high-pressure minerals were rarely found in lunar return samples and lunar meteorites.
After research, the researchers believe that the silica debris recorded the pressure increase of a lunar surface impact event and the subsequent heating and pressure reduction process, and speculated that it is likely to come from the Aristarchus impact in the south of the Chang’e 5 sampling area. pit. This study provides important evidence for the previous view that there is sputtering from a distant impact crater in the Chang’e-5 sampling area through remote sensing data analysis.
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