Fig. 5: Comparison between mineral abundance and time-of-day-dependent variations of lunar hydration maps in the PKT.
From: Widespread ilmenite contributions to the surface water cycle in lunar Procellarum KREEP Terrane
a TiO2 content. b Olivine. c Clinopyroxene. d Plagioclase. The PKT is outlined by a white dashed line. e Variations of hydration by subtracting the noon (12:00–14:00) map from the evening (16:00–17:00) map. f Variations of hydration by subtracting the noon (12:00–14:00) map from the morning (7:00–8:00) map. The IBD3µm parameter was defined and used to quantify the average relative absorption strength across the wavelength interval of 2.7–2.9 µm (ref. 69). The ten ellipses in these panels indicate regions with different mineral abundances and variations in OH/H2O adsorptions. The TiO2 abundance map is generated from the WAC ultra-violet and visible images82, and the mineral abundance maps are produced from the Kaguya Multiband Imager (MI) data83. Some areas lack data for morning or midday values. g Temporal variations in water content versus the abundances of TiO2, olivine, clinopyroxene, and plagioclase. Ten regions, delineated by black ellipses, were selected and quantified. Gray lines represent the possible correlations.
