Fig. 4: Diffuse carbonaceous matter in Ryugu.
From: Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu
A X-ray absorption near-edge structure (XANES) spectra of Ryugu diffuse organic matter in ultramicrotome and focused ion beam (FIB) lamellae, compared with bulk Ryugu, Orgueil, and Murchison insoluble organic matter (IOM). B Scanning transmission x-ray microscopy (STXM) spectral map of a FIB lamella from Chamber A grain A0108-11 showing concentrations of diffuse organic matter with a molecular carbonate signature (magenta = carbon at 285 eV; green = carbonate CO3 at 290.4 eV; blue = mineral carbonate at 302 eV). Mineral carbonates would be visible as a teal color in this map. C Bright-field scanning transmission electron microscopy (STEM) image of intermixed phyllosilicate sheets and brighter, interstitial organic matter from the region shown in B. Arrows denote locations of accumulations of CO3-rich organic matter.
