Spectral characteristics of lunar impact melts and inferred mineralogy

Details Spectral characteristics of lunar impact melts and inferred mineralogy Spectral characteristics of lunar impact melts and inferred mineralogy

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010m%26ps...45.1152t&link_type=abstract

Meteoritics and Planetary Science, Volume 45, Issue 7, pp. 1152-1169.

Mathematics

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7

Scientific paper

Two suites of lunar impact melt samples have been measured in NASA's Reflectance Experiment Laboratory (RELAB) at Brown University. Suite 1 comprises seven Apollo 17 crystalline impact melt breccias and seven quenched glass equivalents. Suite 2 is made up of 15 additional impact melt samples (from Apollo 12, 15, 16, and 17) which exhibit a range of textures and compositions related to cooling conditions and glass abundance. A few of these samples have cooled slowly and fully crystallized, and thus have the same spectral properties as igneous rocks of similar texture and composition; they cannot be uniquely distinguished without geologic context. However, most of the impact melts and melt breccias contain either quantities of quenched glass and/or have developed microcrystalline nonequilibrium textures with well-defined, diagnostic spectral properties. The microcrystalline textures are associated with a distinctive 600nm absorption feature, apparently due to submicroscopic ilmenite inclusions in a transparent host (typically fine-grained plagioclase). The reflectance properties of these lunar sample suites contribute to and constrain the identification and characterization of impact melts in remote sensing data.

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