Mass fractions of the siderophile volatile elements S, Se, and Te were determined together with highly siderophile elements (HSE) and osmium isotope ratios in multiple aliquots of five lunar mafic impact melt breccias. The impactites were sampled from presumably Imbrium‐related ejecta deposits at the Apollo 14, 15, and 16 landing sites. As in many mafic impact melt breccias, all studied impactites display fractionated siderophile element patterns characteristic of differentiated metal, interpreted to reflect metal‐rich impactor material from the core of a differentiated planetesimal. The compositional record of Fra Mauro crystalline matrix breccias and recent constraints on the time of their formation suggest that the admixture of this differentiated metal component to the Procellarum KREEP Terrane occurred before the Imbrium basin was formed. The impact melt rock portion of dimict breccia 61015 displays fractionations of HSE like other mafic impact melt breccias, but CI chondrite‐like ratios of S, Se, Te, and Ir. Preservation of these contrasting impactor signatures in a single impactite sample demonstrates mixing of differentiated metal and CI chondrite‐like impactor material and their homogenization in an impact melt sheet. Correlations of highly siderophile element ratios between impactites from different Apollo landing sites suggest that siderophile element inventories of many lunar impactites were affected by similar mixing processes. Mass fractions and ratios of S, Se, and Te in other mafic impact melt breccias closely resemble those of pristine mafic target rocks.

中文翻译：

---

S-Se-Te和高度嗜铁性元素形成月铁镁铁质撞击熔岩角砾岩的新限制

在五个月球铁镁矿撞击熔岩角砾岩的多个等分试样中，测定了嗜铁菌挥发性元素S，Se和Te的质量分数以及高度嗜铁菌元素（HSE）和同位素比。冲孔岩是从阿波罗14号，15号和16号登陆点的大概与Imbrium相关的喷出物中取样的。像在许多铁镁质撞击熔岩角砾岩中一样，所有研究过的撞击矿都显示出分化金属特有的分形的嗜铁元素元素图案，这被解释为从分化行星的核心反映了富含金属的撞击器材料。Fra Mauro晶体基质角砾岩的组成记录和最近对其形成时间的限制表明，这种差异化的金属成分与Procellarum KREEP Terrane的混合发生在形成盆地之前。像其他镁铁质冲击熔岩角砾岩一样，Dimict角砾岩61015的冲击熔岩部分显示出HSE的分馏，但是S，Se，Te和Ir的CI球粒陨石比率。在单个撞击矿样品中保留这些形成鲜明对比的撞击器特征，表明了分化的金属和CI球粒陨石样撞击器材料的混合以及它们在撞击熔体片中的均质化。来自不同阿波罗着陆点的撞击物之间高度嗜铁元素元素比率的相关性表明，许多月球撞击物的嗜铁元素元素库存受相似的混合过程影响。其他镁铁质撞击熔岩角砾岩中S，Se和Te的质量分数和比例与原始镁铁质靶岩的质量分数和比率非常相似。