Righter K
Mailcode XI2, NASA-JSC, 2101 NASA Parkway, Houston, TX 77058, USA. Email:
Sci Adv. 2019 Jan 23;5(1):eaau7658. doi: 10.1126/sciadv.aau7658. eCollection 2019 Jan.
The compositional and isotopic similarity of Earth's primitive upper mantle (PUM) and the Moon supports the derivation of the Moon from proto-Earth, but the Moon's inventory of volatile lithophile elements-Na, K, Rb, and Cs-is lower than Earth's PUM by factors of 4 to 5. The abundances of 14 other volatile elements exhibit siderophile behavior [volatile siderophile elements (VSEs); i.e., P, As, Cu, Ag, Sb, Ga, Ge, Bi, Pb, Zn, Sn, Cd, In, and Tl] that can be used to evaluate whether the Moon was derived from proto-Earth and if core formation or volatility controlled their depletion. At lunar core formation conditions, As, Sb, Ag, Ge, Bi, and Sn are siderophile, whereas P, Cu, Ga, Pb, Zn, Cd, In, and Tl are weakly siderophile or lithophile. VSEs may help to discriminate between physical and chemical processes that formed the Moon such as low- versus high-energy impacts and gas-melt interactions.
地球原始上地幔（PUM）与月球在成分和同位素上的相似性支持月球源自原地球的观点，但月球中挥发性亲石元素（钠、钾、铷和铯）的含量比地球的PUM低4至5倍。其他14种挥发性元素表现出亲铁行为[挥发性亲铁元素（VSEs）；即磷、砷、铜、银、锑、镓、锗、铋、铅、锌、锡、镉、铟和铊]，可用于评估月球是否源自原地球，以及核心形成或挥发性是否控制了它们的亏损。在月球核心形成条件下，砷、锑、银、锗、铋和锡是亲铁元素，而磷、铜、镓、铅、锌、镉、铟和铊是弱亲铁元素或亲石元素。VSEs可能有助于区分形成月球的物理和化学过程，如低能量与高能量撞击以及气-熔相互作用。
