Fig. 3

a BSE image of A0080. b RGB maps corresponding to Fe-Kα (red), Mg-Kα (green), and Si-Kα (blue). In this image, anhydrous silicates and chondrules would be shown in bright green. c RGB maps of Ca–Kα (red), Fe-Kα (green), and S–Kα (Blue). Bright blue grains and bright green grains correspond to Fe–sulfide (pyrrhotite) and magnetite, respectively. Red grains show Ca- and Ca–Mg carbonate (dolomite). A dotted outline shows boundary lithology 1 (outside), which contains abundant magnetite, pyrrhotite, and dolomite, and lithology 2 (inside). d A combined image of the BSE image with overlayed RGB images of total CHO (Red), CHN (Green) and CHNO (Blue), which are the same figure shown in Fig. 2b. Dotted lines show outlines of the concentrated region for total CHO (pink), total CHN (green), total CHNO (blue), and total CHO–Na (yellow), which is almost consistent with total CHNO, respectively. Note that positioning of the DESI-HRMS images to BSE image contains an uncertainty of ±  ~ 20 µm. e, f pyrrhotite and magnetite grains with various crystal shapes, which were obtained from area (e) and (f) shown in (a)