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Abstract
We investigate the interrelation between the hydration of the lunar regolith and the mineral composition of the surface of the Moon with respect to the concentrations of plagioclase, TiO2 (highly correlated with the oxide mineral ilmenite), and Mg-spinel. The spectral properties of lunar regions with a low concentration of plagioclase or a high concentration of TiO2 or Mg-spinel show a significant reduction in hydration at lunar midday compared to other compositions. This suggests that these oxide minerals contain less of the strongly bound OH component, which is not removed at lunar midday. The time-of-day-dependent variation of the 3 μm band depth is greater in TiO2-rich areas compared to other mare regions. The TiO2-rich regions therefore appear to have a strong tendency to adsorb solar wind-induced hydrogen into binding states of low energy that can more readily desorb and readsorb OH/H2O on a daily basis.
Highlights
IntroductionThe spectral properties of lunar regions with a low concentration of plagioclase or a high concentration of TiO2 or Mg-spinel show a significant reduction in hydration at lunar midday compared to other compositions
Image Analysis Group, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany; Sternberg Astronomical Institute, Moscow State University, Universitetskij Pr., 13, 119234 Moscow, Russia; Institute of Physics, Kazan Federal University, Kremlyovskaya Str., 18, 420008 Kazan, Russia
Images taken between 7 AM and 8 AM local time were defined as morning values, and images taken between noon and 2 PM were defined as midday images
Summary
The spectral properties of lunar regions with a low concentration of plagioclase or a high concentration of TiO2 or Mg-spinel show a significant reduction in hydration at lunar midday compared to other compositions This suggests that these oxide minerals contain less of the strongly bound OH component, which is not removed at lunar midday. Yield NIR spectra that cover the Moon nearly globally for different local times of day This unique coverage enables the investigation of diurnal changes on the Moon. These M3 data show an absorption band near 3 μm that can be found at all latitudes [3,4,5]. Klima et al [14] found OH/H2 O signatures at the Bullialdus crater to be of magmatic origin
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