Classification/Quantification of non-homogeneous basalts using Multivariate Analysis for MSL/ChemCam data

Details Classification/Quantification of non-homogeneous basalts using Multivariate Analysis for MSL/ChemCam data Classification/Quantification of non-homogeneous basalts using Multivariate Analysis for MSL/ChemCam data

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..997c&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.997

Physics

Scientific paper

ChemCam is part of the Mars Science Laboratory (MSL) - Curiosity - rover payload, which is scheduled for launch at the end of November 2011. This instrument is the first one using Laser-Induced Breakdown Spectroscopy (LIBS) for planetary exploration. Chemcam will investigate the geochemistry of the Martian surface [1, 2] at remote distances (1 to 7 m). It is composed of two physical parts: the Body Unit, located in the core of the rover, which includes three spectrometers and their electronics, and the Mast Unit, on top of the mast, which includes the laser, the telescope, the Remote Micro Imaging (RMI) and their electronics. ChemCam performs a small-footprint measurement (0,2 to 0,6 mm in diameter) : the LIBS technique creates a plasma of ablated material in electronically excited states, and then analyses the light with its spectrometers to obtain emission spectra and therefore analyze the composition of the sample. The Flight Model underwent several calibrations before delivery, with a wide range of samples and conditions [3]. Several tools are developed to analyze the data, like the peak identification tool with its ChemCam specific table, and statistical tools to determine the elemental composition of analyzed sample using "Partial Least Square" method (PLS) [4], and also to classify rocks using the Independent Component Analysis (ICA) [5, 6, 7]. The objective of this work is to show the capability of ChemCam to classify phyric textured basalts with porphyrocrysts of variable compositions set in fine-grained mesostasis.

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