Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....14839c&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #14839
Mathematics
Logic
Scientific paper
The Aristarchus Plateau is one of the most complex region on the Moon. It is an old rectangular elevated crustal block about 170x220 km, with its west and east borders approximately concentric to the Imbrium basin, surrounded by younger mare basalts of Oceanus Procellarum. The Plateau shows extensive dark mantling deposit (DMD) of pyroclastic origin, cratering (Aristarchus crater), and mare basalt flooding. This region is important to understand the nature of the lunar crust and its relation with the early volcanism. In this work we integrated UV-VIS-NIR (400-2000nm) Clementine spectral reflectance data. Lunar Prospector data are also used. A statistical analysis (PCA: principal component analysis) has been applied to the integrated dataset in order to evidence extreme spectral behaviors in the spectral population within the Plateau. This permits to determine spectral units in relation with different types of lunar materials. Then an iterative linear mixing modeling has been applied to the dataset, using endmembers spectra determined from the PCA analysis, in order to characterize the lithology and to map geological units. This mapping gives for each unit the degree of eventual mixing of the different types of materials at the subpixel scale. The analysis shows that eight endmembers taken in eight geological units are requested to give a comprehensive description of the distribution and amount of surface mixing of the units present within the Plateau and its immediate vicinity. The integration of the UV-VIS-NIR Clementine data and the method of analysis of the dataset permit to better characterize the composition (mafic components) of the different volcanic and crustal materials present within the Aristarchus Plateau and determine their stratigraphic relationships in order to better understand the chronology of the geologic events (tectonic, volcanic, cratering) in this region of the Moon. Results show that the regional stratigraphy is represented by deep anorthositic-rich materials overlain by pyroxene and olivine bearing crustal materials. A sequence of emplacement of the different geological units we have evidenced on the Plateau is proposed from the early emplacement of the Imbrium basin ejecta, the pyroclastic units and to the last stage of the mare basalt flooding, giving some insight on the nature of the pre-Imbrium crust and stages of volcanism in this region of the Moon.
Baratoux David
Chevrel Serge D.
Costard Francois
Daydou Yves
Le Mouélic Stéphane
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