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recently,the research team of the institute of geology and geophysics of the chinese academy of sciences and their collaborators used three volcanic glass beads found in the chang'e 5 lunar samples to prove that magma activity on the moon can be traced back to 120 million years ago.this research result once again refreshed people's understanding of the time limit of lunar magma activity. the relevant results were published in the international academic journal science on september 6.

schematic diagram of volcanic glass formed by lunar eruption

exploring the duration of lunar volcanic activity is a prerequisite for studying the geological evolution of small celestial bodies. isotope age determination of lunar samples is an accurate method to explore the duration of lunar volcanic activity.in 2021, chinese scientists proved that there was still large-scale magma activity on the moon 2 billion years ago, extending the previously believed "lifespan" of the moon by about 1 billion years.。

bse images and u-pb dating results of three chang'e 5 volcanic glass beads

the research team selected about 3,000 glass beads from about 3 grams of chang'e-5 lunar soil and conducted detailed research. based on previous experience in distinguishing impact glass and volcanic glass, they innovatively proposed that sulfur isotope characteristics can be used as key evidence to distinguish the origin of glass beads. they identified three volcanic glass beads and conducted chronological studies, and found that these three volcanic glass beads were formed about 120 million years ago.

li qiuli, a researcher at the institute of geology and geophysics of the chinese academy of sciences, said that although no large-scale late-stage magmatic activity has been observed on the moon, there may still be small-scale volcanic eruptions caused by local warming. this result is of great significance for rethinking the lunar thermal evolution model and provides an important reference for the study of the duration of volcanic activity evolution in small celestial bodies.

(cctv reporter shuai junquan and chu erjia)