期刊
PLANETARY AND SPACE SCIENCE
卷 126, 期 -, 页码 24-33出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2016.04.003
关键词
Mars; Laser-Induced Breakdown Spectroscopy; Rock coatings; Depth profiling; Svalbard
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canadian Space Agency (CSA)
- McDonnell Center for Space Sciences at Washington University in St. Louis
- NASA Mars Fundamental Research Program [NNX13AJ18G]
- Ministerio de Economia y Competitividad of Spain
- NASA [NNX13AJ18G, 472773] Funding Source: Federal RePORTER
We demonstrate that Laser-Induced Breakdown Spectroscopy (LIBS) is capable of identifying the presence of natural rock coatings, and we define LIBS signatures of complex multi-layered coatings. This is illustrated by detailed LIBS analysis, in Mars-simulated conditions, of a rock collected in the Svalbard Islands, and which is analogous to some altered Martian rocks. The sample is a basaltic rock with sub mm Ca-Mg-Fe-Si rich mineral coatings. LIBS elemental analysis of several distinct regions on the surface of the rock demonstrates the variability of chemical compositions of the various coatings, which is confirmed by complementary scanning electron microscope (SEM) analysis. Furthermore, the LIBS analysis as a function of the depth at different locations shows chemical variability, indicative of penetration through thin coatings of varying composition. Fine-scale, three-dimensional LIBS analysis is of interest for identifying and characterizing coatings on martian rocks, likely originating from aqueous processes, providing a rapid chemical composition as a function of the layers and further understanding of the formation of the deposits and on planetary evolution. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.
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