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Geochemistry and Impact History at the Apollo 16 Landing SiteLunar impact glasses possess the unmodified refractory element ratios of the original fused target materials at the sites of impacts. These target materials are usually regolith. 866 glasses from the Apollo 16 landing site have been analyzed by electron microprobe in this study. These glasses show significant variation and hint at the existence of highland basalt (HB) regolith compositions atypical of the usual HB compositions historically found at the Apollo 16 site. Additionally, a large number of mare glasses have been identified. Clementine color image data have been used to construct iron, titanium, and aluminum maps for comparison with the sample database. These maps suggest that the Apollo 16 landing site is largely composed of anorthositic material and that mare compositions are not found close by. Nine of these impact glasses have been dated by the Ar-40/Ar-39 technique and may be used to constrain the impact history at the Apollo 16 landing site. These results illustrate how lunar impact glasses together with orbital data can provide geochemical constraints on the local and regional geology of the Moon.
Document ID
20030111590
Document Type
Conference Paper
Authors
Zellner, N. E. B. (Lawrence Livermore National Lab. Livermore, CA, United States)
Spudis, P. D. (Johns Hopkins Univ. Laurel, MD, United States)
Delano, J. W. (Albany Univ. Albany, NY, United States)
Whittet, D. C. B. (Rensselaer Polytechnic Inst. Troy, NY, United States)
Swindle, T. D. (Arizona Univ. Tucson, AZ, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
CONTRACT_GRANT: NAG5-7598
Distribution Limits
Public
Copyright
Public Use Permitted.

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