Composition of the Lower Crust Identified at Basin Rings

Details Composition of the Lower Crust Identified at Basin Rings Composition of the Lower Crust Identified at Basin Rings

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1142p&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1142

Computer Science

Scientific paper

In contrast to the extensively mixed lunar megaregolith [e.g., 6], materials exposed along the inner ring of several impact basins exhibit compositionally distinct mineral lithologies. We interpret these rocktypes to be deep-seated materials brought to the surface and exposed by the basin forming event. An initial survey of such materials using data from the Moon Mineralogy Mapper (M3) reveals compositions expected from the lunar samples (anorthosite, norites, troctolites), as well as new and unusual lithologies (pink spinel anorthosite, pyroxenite, and perhaps dunite). A simple magma ocean model is consistent with remote observations and samples from the upper crust, but is inadequate to describe our observations of the lower crust. We are beginning to glimpse the actual complexity of lunar lower crust evolution.

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