The hydroxyl content and hydrogen isotope composition of Lunar apatites

Initial studies of Apollo rock samples concluded that the Moon was an anhydrous planetary body [1]. Recently there has been a change of opinion with several research groups detecting variable amounts of H2O in lunar mare glass beads [2], melt inclusions [3] and hydroxyl in lunar apatites [4-9]. The maximum amount of water detected thus far has been from mare basalt 12039 [10]. These authors also measured the D/H ratio of lunar apatites, with δD values ranging from – 215 ‰ to +1010 ‰ in the case of mare basalts and from +240 ‰ to +340 ‰ in the case of highlands anorthosite clast 14305. The water content of these samples varied from ~0 to 0.6 wt.%. Here we report δD values and hydroxyl contents of apatite grains from Apollo mare basalt 12064 and lunar mare basalt meteorite Miller Range MIL 05035