Day James M D, Pearson D Graham, Taylor Lawrence A
Department of Earth and Planetary Science, University of Tennessee, Knoxville, TN 37996, USA.
Science. 2007 Jan 12;315(5809):217-9. doi: 10.1126/science.1133355.
A new combined rhenium-osmium- and platinum-group element data set for basalts from the Moon establishes that the basalts have uniformly low abundances of highly siderophile elements. The data set indicates a lunar mantle with long-term, chondritic, highly siderophile element ratios, but with absolute abundances that are over 20 times lower than those in Earth's mantle. The results are consistent with silicate-metal equilibrium during a giant impact and core formation in both bodies, followed by post-core-formation late accretion that replenished their mantles with highly siderophile elements. The lunar mantle experienced late accretion that was similar in composition to that of Earth but volumetrically less than (approximately 0.02% lunar mass) and terminated earlier than for Earth.
一个新的月球玄武岩铼-锇和铂族元素组合数据集表明，这些玄武岩中亲铁元素的丰度普遍较低。该数据集显示，月球地幔具有长期的球粒陨石亲铁元素比率，但绝对丰度比地球地幔低20倍以上。这些结果与两个天体在巨碰撞和地核形成过程中的硅酸盐-金属平衡一致，随后是地核形成后的晚期吸积，用亲铁元素补充了它们的地幔。月球地幔经历了晚期吸积，其组成与地球相似，但体积小于（约占月球质量的0.02%）且比地球更早结束。
