Composition of the Ejecta Deposits of Selected Lunar Basins from Clementine Elemental Maps

Details Composition of the Ejecta Deposits of Selected Lunar Basins from Clementine Elemental Maps Composition of the Ejecta Deposits of Selected Lunar Basins from Clementine Elemental Maps

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1255s&link_type=abstract

Lunar and Planetary Science, volume 27, page 1255

Computer Science

Basins, Composition, Crust, Ejecta, Moon

Scientific paper

The composition of basin ejecta can be studied to probe the lunar crust and to understand better the process of large-body impact. Our method uses remote-sensing data to measure the composition of ejecta for many basins of differing sizes, ages, locations around the Moon. We have used orbital maps of chemical concentration made by Apollo as well as Earth-based spectra for selected spots within the ejecta. Until now, no basin has had complete coverage of its entire ejecta blanket, as the Apollo groundtracks typically covered a small fraction of the deposit and the telescopic data were 1-2 km diameter spots. Data from the Clementine mission provide global coverage at uniform viewing conditions, resolution, and geometry in a variety of spectral bands in the visible and near-infrared. Recently, Lucey et al. have reported on a new technique to extract iron and titanium concentrations for the lunar surface from Clementine global images. We have used these new maps to provide our first estimate of the mean composition of the ejecta from a variety of near and far side basins. We have compared these estimates to our previous results for parts of the ejecta blanket and are re-examining our previous estimate for bulk crustal composition based on these analyses. Results support the idea that the lunar crust is lower in Fe (i.e., richer in Al) than previously estimated, supporting the concept of a global magma ocean on the early Moon.

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