Fig. 2.
Characteristics of the CHOMg chemical space. CHOMg chemical compositions of NWA 7325 soluble organic matter are depicted by mass-edited H/C ratio, for the complete (A) and zoomed-in compositional space (B), illustrating the density of fairly complete homologous series within the CHOMg compositional space. The bubble size represents the relative intensity of the mass peaks. The detailed arrangement of CHOMg compounds allows visualization of nominal elemental/molecular transformations, with examples provided (circled numbers: ①, C18H33MgO5−; ②, C19H33MgO5−; ③, C19H35MgO5−; ④, C21H37MgO4−; and ⑤, C20H35MgO5−). (C) Relative abundances of these Mg-metalorganics, shown in different colors (B and C), demonstrate the dominance of the MgO4R− molecular subspace, with R = hydrocarbon CxHy and x, y ∈ ℕ.