Determination of the systematics of volatile elements (for example, H, Cl, S) of the early Moon is one of the main objectives of lunar science. This has been hindered by the lack of the main volatile-bearing mineral, apatite, in ferroan anorthosites (FANs), which are thought to represent the primary products of the lunar magma ocean and the earliest lunar crust. Due to the absence of apatite, plagioclase and bulk samples of the FAN suite have been previously utilized for the studies of volatiles in samples representing the earliest-formed lunar crust. Here we provide evidence of apatite in a FAN clast in the lunar meteorite Arabian Peninsula 007. We report that Arabian Peninsula 007 has an ancient age, comparable to those of Apollo FAN samples, with lighter hydrogen (δD = −45‰) and heavier chlorine (δ³⁷Cl = +44‰) isotopic compositions than FAN bulk and plagioclase data. These results suggest that the early lunar crust was significantly more volatile rich than previously thought.

测定早期月球的挥发性元素（例如，H、Cl、S）的系统学是月球科学的主要目标之一。由于铁斜长石（FAN）中缺乏主要的含挥发性矿物磷灰石，这一点受到了阻碍，铁斜长石被认为代表了月球岩浆海洋和最早月壳的主要产物。由于不存在磷灰石，FAN 套件的斜长石和大块样品先前已用于研究代表最早形成的月壳的样品中的挥发物。在这里，我们提供了月球陨石阿拉伯半岛 007 中 FAN 碎屑中存在磷灰石的证据。我们报告说，阿拉伯半岛 007 的年龄非常古老，与阿波罗 FAN 样本的年代相当，具有较轻的氢（δD = -45‰）和较重的氯(δ ³⁷ Cl = +44‰) 同位素组成比 FAN 散装数据和斜长石数据。这些结果表明，早期月壳的挥发性比之前认为的要丰富得多。