Textural and modal analyses of picritic basalts with ChemCam Laser-Induced Breakdown Spectroscopy
作者： A. Cousin , V. Sautter , C. Fabre , S. Maurice , R. C. Wiens
DOI: 10.1029/2012JE004132
关键词:
摘要: [1] The ChemCam instrument suite on the Mars Science Laboratory rover Curiosity provides standoff compositional information using first Laser-Induced Breakdown Spectroscopy (LIBS) a planetary mission and visual data sample texture remote microimager. The LIBS technique is normally used to provide both qualitative (PCA, ICA) quantitative (PLS) measurements. In this study we test its ability evaluate variations in proportion of different mineral phases, distribution grains relative proportions pyroxene plagioclase five basaltic rocks: (1) three picritic samples: Martian shergottite Dar al Gani 476 with olivine phenocrysts coarse-grained pyroxene-rich matrix; terrestrial analog Gusev basalt fine-grained matrix equal amounts plagioclase; synthetic microlitic glass (2) two rocks. measurements were acquired at 3-m distance constant 400 μm beam size. number analysis locations per was fixed regardless rock texture. Results show that can be easily distinguished from groundmass. standard deviation Ca/Al emission line ratios correlates grain size analyzed rocks corresponds amount sample, even when smaller than laser spot
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