大型撞击造成月幔“蒸发”？嫦娥六号样品又有新发现

Core Insights - The research conducted by Chinese scientists reveals that the impact event in the South Pole-Aitken Basin led to the loss of moderately volatile elements in the lunar mantle, providing crucial evidence for understanding the effects of large impacts on lunar evolution and the cause of the Moon's "bipolarity" [1][2] Group 1 - The high-precision potassium isotope analysis performed on samples from the Chang'e 6 mission acts like a "geological detective," capturing subtle changes in isotope ratios to reconstruct the traces left by impact events [1] - The analysis indicates that the potassium isotope ratios in the Chang'e 6 basalt samples differ from those of samples from the Moon's near side, confirming that the impact event altered the lunar mantle [1] - The study highlights that the loss of volatile elements during the high-temperature conditions of the impact may suppress the formation of deep lunar magma and volcanic activity, providing new clues for understanding the geological evolution asymmetry between the Moon's near and far sides [2] Group 2 - The related findings were published in the Proceedings of the National Academy of Sciences of the United States of America on January 13 [3]