Christiansen Feature Map from the Lunar Reconnaissance Orbiter Diviner Lunar Radiometer Experiment: Improved Corrections and Derived Mineralogy

1Paul G. Lucey,2Benjamin Greenhagen,3Kerri Donaldson Hanna,4Neil Bowles,1Abigail Flom,5David A. Paige
Journal of Geophysical Research Planets (in Press) Link to Article [https://doi.org/10.1029/2020JE006777]
1Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa
2The Johns Hopkins University Applied Physics Laboratory
3University of Central Florida
4Atmospheric, Oceanic and Planetary Physics, Clarendon Laboratory, Oxford University
5University of California at Los Angeles
Published by arrangement with John Wiley & Sons

Maps of plagioclase, olivine and pyroxene at 1 km resolution are derived from a combination of data from the Diviner Lunar Radiometer on the Lunar Reconnaissance Orbiter and the Kaguya Multiband Imager. The Diviner instrument features three infrared bands designed to characterize a spectral feature of lunar soils that is sensitive to the average silica polymerization of the surface called the Christiansen Feature, which is directly sensitive to the presence of plagioclase, the dominant lunar silicate. Existing global mineral maps based on near‐IR data largely infer the presence of plagioclase from the bright mineral’s effect on total reflectance, excepting in rare locations where the surface is nearly pure plagioclase and a weak feature in the plagioclase near‐IR spectrum can be relied upon. By integrating both wavelength regions we produced more robust estimates of the abundance of the three dominant minerals. In the process of this work, we also improved the removal of space weathering effects from Christiansen Feature maps, and showed that silica rich compositional anomalies could be reliably detected by decorrelating Christiansen Feature and FeO maps. New silica‐rich locations are reported as are the global abundances of the three major silicates.

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