Spectral reflectance studies of the Humorum Basin region

Details Spectral reflectance studies of the Humorum Basin region Spectral reflectance studies of the Humorum Basin region

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24.1133p&link_type=abstract

In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z p 1133-1134 (SEE N94-20636 05-91

Other

1

Anorthosite, Basalt, Lithology, Lunar Craters, Lunar Geology, Lunar Maria, Spectral Reflectance, Spectrum Analysis, Structural Basins, Volcanology, Absorption Spectra, Debris, Highlands, Pyroxenes

Scientific paper

A portion of the mare-bounding (MB) ring of Humorum Basin is composed of pure anorthosite while other parts of the ring are composed of noritic anorthosite. An episode of mare volcanism emplaced basaltic units in the region northwest of the MB ring after the Humorum impact event. Subsequently, large impacts emplaced a veneer of highlands material atop the basalt flows. Some mare material could have been mixed with this highlands debris either by local mixing by secondary craters or by vertical mixing. Spectra for most other highlands units in the region indicate a noritic anorthosite lithology. Spectra of mare basalts in Mare Humorum and nearby mare flooded craters show relatively deep absorption bands due to the presence of abundant high-Ca pyroxene. An analysis of spectra for a small number of craters in the highlands west of the outer ring of Humorum reveals the presence of high-Ca pyroxene. This suggests the possible presence of an extensive gabbroic province.

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