Lunar Xenon and the Origin of the Indigenous Component
Lunar Xenon and the Origin of the Indigenous Component
复制标题
月球氙和本土成分的起源
作者：
K. Mathew;K. Marti
月球原生Xe同位素丰度不仅提供了关于太阳原行星盘中气藏之间关系的重要信息，而且还提供了关于行星分选过程和由于活跃的年轻太阳可能造成的空间天气影响的重要信息。月球原生的Xe同位素组成尚未确定。利用阿波罗16号和17号任务中不同成分的岩石，对先前推断的月球Xe特征进行了验证。古老的月球高地岩石携带着宇宙射线产生的散裂和中子捕获产物、由244Pu和238U产生的裂变成分以及地球污染气体，所有这些都使月球原生Xe成分的识别复杂化。本研究揭示了轻、重同位素丰度与陆地Xe组成相适应。我们的结论是，为了在月球上牢固地建立本地的Xe特征，应该在月球上对最近陨石坑的斜长岩喷出物的内部样本进行Xe测量。
Lunar indigenous Xe isotopic abundances provide crucial information on relationships not only between gas reservoirs in the solar protoplanetary disk but also regarding planetary fractionation processes and possible space weather effects due to an active young Sun. The indigenous lunar Xe isotopic composition is not yet firmly established. A verification of previously inferred lunar Xe signatures using rocks of varying compositions from Apollo 16 and 17 missions is made here. Ancient lunar highland rocks carry cosmic-ray-produced spallation and neutron-capture products, fission components due to 244Pu and 238U, as well as terrestrial contamination gas, all complicating the identification of the indigenous lunar Xe component. The present study reveals light and heavy isotopic abundances compatible with terrestrial Xe composition. We conclude that in order to firmly establish indigenous lunar Xe signatures in situ, Xe measurements on the moon in interior samples of anorthositic ejecta from very recent craters should be performed.