The South Pole-Aitken basin region,Moon: GIS-based geologic investigation using Kaguya elemental information |
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| Authors: | Kyeong Ja Kim,James M. Dohm,Jean-Pierre Williams,Javier Ruiz,Trent M. Hare,Nobuyuki Hasebe,Yuzuru Karouji,Shingo Kobayashi,Makoto Hareyama,Eido Shibamura,Masanori Kobayashi,Claude d&rsquo Uston,Olivier Gasnault,Olivier Forni,Sylvestre Maurice |
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| Affiliation: | 1. Geological Research Division, Korea Institute of Geosciences & Mineral Resources, Daejeon, South Korea;2. Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721, USA;3. Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA;4. Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, 28040 Madrid, Spain;5. U.S. Geological Survey, Flagstaff, AZ 86001, USA;6. Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo 169-8555, Japan;g Japan Aerospace Exploration Agency, Sagamihara, Kanagawa 229-8510, Japan;h National Institute of Radiological Sciences, Inage, Chiba, Japan;i Saitama Prefectural University, Saitama 343-8540, Japan;j Chiba Institute of Technology, Narashino, Chiba 275-0016, Japan;k Universite de Toulouse; UPS-OMP; CNRS; IRAP; 9 Av. colonel Roche, F-31028 Toulouse cedex 4, BP 44346, France |
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| Abstract: | Using Geographic Information Systems (GIS), we performed comparative analysis among stratigraphic information and the Kaguya (SELENE) GRS data of the ∼2500-km-diameter South Pole-Aitken (SPA) basin and its surroundings. Results indicate that the surface rock materials (including ancient crater materials, mare basalts, and possible SPA impact melt) are average to slightly elevated in K and Th with respect to the rest of the Moon. Also, this study demonstrates that K and Th have not significantly changed since the formation of SPA. The elemental signatures of the impact basin of Fe, Ti, Si, O through time include evidence for resurfacing by ejecta materials and late-stage volcanism. The oldest surfaces of SPA are found to be oxygen-depleted during the heavy bombardment period relative to later stages of geologic development, followed by both an increase in silicon and oxygen, possibly due to ejecta sourced from outside of SPA, and subsequent modification due to mare basaltic volcanism, which increased iron and titanium within SPA. The influence of the distinct geologic history of SPA and surroundings on the mineralogic and elemental abundances is evident as shown in our investigation. |
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| Keywords: | Kaguya (SELENE) Gamma-Ray Spectrometer South Pole-Aitken basin Elemental maps Impact |
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