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. 2018 Feb 5;8:2396. doi: 10.1038/s41598-018-20890-4

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

PMC Copyright notice

PCA results obtained by combining 5 S-FTIR images (Areas 1, 2, 4, 6 and 9) following the preprocessing procedure (i.e. wavenumber range selection, 2^d derivative, normalization and mean centering). Loadings (a) and scores (b) are shown for principal components (PC) 1 to 5. The percentage of total variance explained by the principal component is given along the y-axis. Main peaks on loadings are highlighted and were assigned to organic compounds (red arrows), saponite (yellow arrows), olivine (green arrows) and white serpentine (grey arrows). Peaks values noted in black were not undoubtedly assigned. Note that due to the second derivative process blue colors in score maps correspond to the upper part of the loadings (>0) whereas red colors correspond to the lower part (<0).