Figure 5

Plot of Cl, S, and F vs. C in the olivine-hosted melt inclusions (circles) and individual glass beads (squares) for A17 sample 74220. (Data from Saal et al. 2008, Hauri et al. 2011, and Hauri et al. 2015.) As discussed in the text, Cl does not appear to partition into the CO-rich gas formed during Stage 2 of the OPGM ascent recorded by the C decrease in the melt inclusions, but ~50 ppm S may enter the gas in this stage. As discussed in the text, four M.I.’s with low (<1 ppm C) have very low dissolved H2O and low Cl compared with the highest H2O inclusion with equally low C, and are interpreted to have degassed by diffusion through channels prior to sealing by olivine growth. Beginning at ~0.5 km depth in the crust, H2O, S, F, and Cl partition strongly into the gas phase as the magma nears the lunar surface and fragments.

© De Gruyter