Fig. 11

a BSE image of the Orgueil meteorite. b A combined image of the BSE image with overlayed RGB images of total CHO (Red), CHN (Green) and CHNO (Blue). Dotted lines show outlines of the concentrated region for total CHO (pink), total CHN (green), total CHNO (blue), and total CHO–Na (yellow), respectively. Those outlines are corresponding to an ion intensity of > 40% of the maximum intensity for each compound. Note that positioning of the DESI-HRMS images to BSE image contains an uncertainty of ±  ~ 20 µm. c, d BSE and RGB maps of Ca (Red) Fe (Green) and S (Blue) or Ca (Red) P (Green) and S (Blue) of SOM concentrated regions shown in (c) and (d) in (b). In RGB maps of Ca (Red) Fe (Green) and S (Blue), light green and purple grains are corresponding Fe–sulfide, which almost pyrrhotite, and Ca–sulfate, respectively. In region (d), many Ca-phosphate (apatite) are observed by yellow color in RGB maps of Ca (Red) P (Green) and S (Blue). Large grains shown in blue color in both RGB maps (CaFeS and CaPS) are corresponding to Mg sulfate. All scale bars for images in (c) and (d) correspond to 100 µm