Fig. 1: Variations of measured H2O content with depth in lunar soils.
From: Widespread ilmenite contributions to the surface water cycle in lunar Procellarum KREEP Terrane
a CE5 ilmenite. Two ilmenites from CE5 core soils34 are also shown. b–d The Apollo and CE5 olivine, pyroxene, and plagioclase grains. The silicate minerals that have been analyzed by ion microprobe are from previous studies8,25,34. Some depth profiles with abnormal water contents at some depths are not included in the diagram. Only the distribution of H2O concentration in the first 300 nm of the depth profiles is shown due to the low and constant H2O abundance within grains. The measured H2O concentrations were corrected for the background using the San Carlos olivine standard.
